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Viagra

Viagra is one of the best-known treatments for erectile dysfunction (ED). ED is caused by insufficient blood flow to the penis, resulting in the inability to maintain an erection. Viagra can dramatically enhance the quality of an erection by increasing blood flow to the penis. Its effect lasts for 4-6 hours. Viagra is widely known to treat PAH (pulmonary arterial hypertension).

Other names for this medication:

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Also known as:  Sildenafil Citrate.

Description

Viagra is an anti-impotence drug which enables men to achieve and sustain an erection.

The active ingredient of Viagra is Sildenafil Citrate (PDE-5 inhibitor). In response to sexual arousal, Sildenafil Citrate stimulates the release of nitric oxide (NO) in the corpus cavernosum. Nitric oxide activates the lyase enzyme which is followed by increasing levels of cyclic guanosine monophosphate (cGMP). This cyclic nucleotide relaxes smooth muscles in blood vessels of the corpus cavernosum, increasing blood flow and thus inducing an erection.

Along with the treatment of erectile disorders, Viagra effectively prolongs sexual performance, preventing premature ejaculation (PE).

Sildenafil Citrate is also used in the treatment of PAH (pulmonary arterial hypertension).

Viagra is also known as Aphrodil, Caverta, Kamagra, Suhagra, Edegra, Erasmo, Penegra, Revatio, Supra, Silagra, Zwagra.

Viagra does not protect you or your partner from sexually transmitted diseases (including HIV) or from pregnancy.

Dosage

Take one Viagra pill orally with a full glass of water, 30-60 minutes before sex.

The dosage depends on the overall health of the patient. Do not take more than one pill per day.

Take Viagra on an empty stomach, as fatty meals, grapefruit juice and alcohol can interfere with the effectiveness of the medication.

Overdose

If you take an overdose of Viagra, you should seek emergency medical attention or contact your healthcare provider immediately.

Storage

Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F) and away from excess moisture and heat. Throw away any unused medicine after the expiration date. Keep out of the reach of children.

Side effects

The most common side effects associated with Viagra are:

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Side effect occurrence does not only depend on medication you are taking, but also on your overall health and other factors.

Contraindications

Do not take Viagra if you are allergic to any of Viagra’s components.

Do not take Viagra if you are also using organic nitrates, nitrate drugs for chest pain or heart condition (e.g., nitroglycerin, isosorbide dinitrate and isosorbide mononitrate), nitrates as amyl nitrate or nitrite ("poppers").

Do not take Viagra if you take other medications to treat erectile dysfunction or pulmonary arterial hypertension, such as riociguat (Adempas).

Do not take Viagra if you are taking erythromycin, alpha-blockers, ketoconazole, itraconazole (Sporanox or Nizoral), ritonavir (Norvir) or indinavir (Crixivan).

Do not consume alcohol while using Viagra, as it can lower your blood pressure, causing dizziness and rapid heart rate (tachycardia).

Do not drive or operate machinery while taking the medication.

Contact you doctor or health care professional right away if your erection lasts longer than 4 hours or if it becomes painful.

Viagra does not protect you or your partner from sexually transmitted diseases or pregnancy.

Viagra can be dangerous for children and women.

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Nitric oxide (NO) plays essential roles in many biotic and abiotic stresses in plant development procedures, including pollen tube growth. Here, effects of NO on cold stress inhibited pollen germination and tube growth in Camellia sinensis were investigated in vitro. The NO production, NO synthase (NOS)-like activity, cGMP content and proline (Pro) accumulation upon treatment with NO scavenger cPTIO, NOS inhibitor L-NNA, NO donor DEA NONOate, guanylate cyclase (GC) inhibitor ODQ or phosphodiesterase (PDE) inhibitor Viagra at 25°C (control) or 4°C were analyzed. Exposure to 4°C for 2 h reduced pollen germination and tube growth along with increase of NOS-like activity, NO production and cGMP content in pollen tubes. DEA NONOate treatment inhibited pollen germination and tube growth in a dose-dependent manner under control and reinforced the inhibition under cold stress, during which NO production and cGMP content promoted in pollen tubes. L-NNA and cPTIO markedly reduced the generation of NO induced by cold or NO donor along with partly reverse of cold- or NO donor-inhibited pollen germination and tube growth. Furthermore, ODQ reduced the cGMP content under cold stress and NO donor treatment in pollen tubes. Meanwhile, ODQ disrupted the reinforcement of NO donor on the inhibition of pollen germination and tube growth under cold condition. Additionally, Pro accumulation of pollen tubes was reduced by ODQ compared with that receiving NO donor under cold or control condition. Effects of cPTIO and L-NNA in improving cold-treated pollen germination and pollen tube growth could be lowered by Viagra. Moreover, the inhibitory effects of cPTIO and L-NNA on Pro accumulation were partly reversed by Viagra. These data suggest that NO production from NOS-like enzyme reaction decreased the cold-responsive pollen germination, inhibited tube growth and reduced Pro accumulation, partly via cGMP signaling pathway in C. sinensis.

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Sildenafil citrate with the VSTR test has effective and reliable results which was regarded as very important to diagnose and determine objectively the amount of therapeutic doses in impotence. In accordance with the literature data, our results also confirm the reliability and the practical nature of the VSTR test, which is less time-consuming and cheaper than the nocturnal penile tumescence and rigidity (NPTR) test. In the VSTR test, necessary doses of medication needed for satisfactory erection were easily regulated in patients with certain kinds of impotence. Additionally, self-criticism advantage of the patients on erection and an unnecessary need for regular sexual partners may make this test preferable in the near future. However, we believe that a large group of patients with other definite parameters are certainly needed in order to obtain more reliable data.

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Sildenafil (Viagra), an inhibitor of phosphodiesterase 5, has a powerful vasodilatory effect on the corpus cavernosa. An evaluation of coronary risk is necessary before its prescription in order to answer two questions: does taking this drug expose the patient to any special risk? Does the return to sexual activity itself carry any risk? Sildenafil is associated with a slight decrease in systolic (10 mmHg) and diastolic (7 mmHg) blood pressure which does not seem to be accentuated by the concommittant use of antihypertensive drugs. The co-administration of nitrate derivatives (before or after taking sildenafil) causes potentially dangerous falls in blood pressure (on average 40 mmHg for the systolic blood pressure). Co-administration of sildenafil and NO-donors is formally contra-indicated. The safety of sildenafil has been shown to be satisfactory in clinical trials: in particular, the risk of myocardial infarction is no greater in treated patients. Sexual activity is a generally moderately intense physical exercise and only rarely causes myocardial infarction. In practice, in patients without known coronary artery disease, the clinical history should be sufficient to determine whether the return of sexual relations is possible without risk. In known cardiac patients, sildenafil is contra-indicated in unstable situations; in stable coronary disease, it would seem wise to take advantage of the annual exercise stress testing to make sure of the absence of ischaemia on effort. In all cases, the patient must be warned that co-administration of nitrate derivatives is an absolure contra-indication to sildenafil treatment.

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Basal skin microvascular flow in the penis increased significantly following SIL administration. The endothelium-dependent skin microvascular vasodilator responses induced by ACh were also significantly enhanced following SIL administration for each of the following parameters: peak values of cutaneous vascular conductance (CVC); increases in CVC; and the area under the curve for ACh-induced vasodilation. ACh-induced microvascular vasodilation in the forearm was not modified by SIL. Finally, the administration of electric current alone did not affect penile microvascular flow.

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As the peripheral role of dopamine in the mediation of penile erection was recently identified, its potential role in the modulation of NO action and whether D1 or D2 receptors are involved in this potential modulation was investigated. The isolated rabbit corpus cavernosum and measurement of intracavernosal pressure in the anesthetized rat model were used. The selective D1 antagonist SCH23390 but not the D2 antagonist sulpiride reduced the inhibitory effect of N(G)-nitro-L-arginine (L-NNA) and the potentiatory effect of sildenafil on erectile responses. L-NNA did not change the inhibitory effect of SCH23390 or the potentiatory effect of apomorphine but enhanced the effect of high-dose fenoldopam on intracavernosal pressure. Similarly, fenoldopam produced 47.30 ± 6.89% potentiation of relaxation of corpus cavernosum in absence of L-NNA and 80 ± 9.34% potentiation in its presence at 3 Hz. The effect of sildenafil was greatly reduced by pretreatment with SCH23390 or sulpiride and completely abolished by their combination. This study supports the role played by D1 receptors peripherally in the control of penile erection. Absence of NO may potentiate the effect of D1 receptor on erection. Activation of D1 receptors may be involved in the synthesis of NO in the corpus cavernosum or may activate the role of NO in erection.

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Oral tadalafil was administered easily and tolerated well and improved mean pulmonary artery pressure (MPAP) in children with PAH, which suggests that oral tadalafil may be more effective and safer than sildenafil in the treatment of PAH.

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Postoperative treatment with atorvastatin in men who report normal erectile function preoperatively may contribute to earlier recovery of erectile function after nerve sparing radical retropubic prostatectomy.

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Little is known about pharmaceutical and personal care products pollutants (PPCPs), but there is a growing interest in how they might impact the environment and microbial communities. The widespread use of Viagra (sildenafil citrate) has attracted great attention because of the high usage rate, the unpredictable disposal and the unknown potential effects on wildlife and the environment. Until now information regarding the impact of Viagra on microbial community in water environment has not been reported. In this research, for the first time, the genetic profile of the microbial community, developing in a Viagra polluted water environment, was evaluated by means of the 16S and 18S rRNA genes, for bacteria and fungi, respectively, amplified by polymerase chain reaction (PCR) and separated using the denaturing gradient gel electrophoresis (DGGE) technique. The DGGE results revealed a complex microbial community structure with most of the population persisting throughout the experimental period. DNA sequences from bands observed in the different denaturing gradient gel electrophoresis profiles exhibited the highest degree of identity to uncultured bacteria and fungi found previously mainly in polluted environmental and treating bioreactors. Biotransformation ability of sildenafil citrate by the microbial pool was studied and the capability of these microorganisms to detoxify a polluted water ecosystem was assessed. The bacterial and fungal population was able to degrade sildenafil citrate entirely. Additionally, assays conducted on Daphnia magna, algal growth inhibition assay and cell viability determination on HepG2 human cells showed that biotransformation products obtained from the bacterial growth was not toxic. The higher removal efficiency for sildenafil citrate and the lack of toxicity by the biotransformation products obtained showed that the microbial community identified here represented a composite population that might have biotechnological relevance to retrieve sildenafil citrate contaminated sites.

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We sought to determine whether the addition of a statin with sildenafil would improve ED in men who initially responded poorly to sildenafil.

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The Spanish group of researchers included 119 patients. The erectile function domain score showed significantly greater improvement for the group of sildenafil. The difference in change in total mean score of the SEAR after treatment was 16.9 (95% CI 8.9, 24.8) for sildenafil over placebo (p=0.0001), with a significantly higher score improvement in all the domains of the SEAR for Sildenafil. There was a significant correlation between the changes in the domain of self-esteem of the SEAR and the IIEF erectile function domain for both treatment groups.

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Rod responses were obtained over a range of retinal illuminances from those producing a minimum detectable response to those producing rod saturation. Intensity amplitude function was determined.

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This exploratory study examines the experience of three gay couples managing sexual dysfunction as a result of undergoing a radical prostatectomy. Semi-structured interviews were conducted as part of a larger study at an urban hospital in Toronto, Ontario, Canada. Interview transcripts were transcribed verbatim, and analyzed using interpretative phenomenological analysis. The authors clustered 18 subordinate themes under 3 superordinate themes: (a) acknowledging change in sexual experience (libido, erectile function, sexual activity, orgasmic function); (b) accommodating change in sexual experience (strategies: emphasizing intimacy, embracing plan B, focus on the other; barriers: side-effect concerns, loss of naturalness, communication breakdown, failure to initiate, trial and failure, partner confounds); and (c) accepting change in sexual experience (indicators: emphasizing health, age attributions, finding a new normal; barriers: uncertain outcomes, treatment regrets). Although gay couples and heterosexual couples share many similar challenges, we discovered that gay men have particular sexual roles and can engage in novel accommodation practices, such as open relationships, that have not been noted in heterosexual couples. All couples, regardless of their level of sexual functioning, highlighted the need for more extensive programming related to sexual rehabilitation. Equitable rehabilitative support is critical to assist homosexual couples manage distress associated with prostatectomy-related sexual dysfunction.

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Fourteen patients with CTEPH and seven healthy control subjects underwent cardiopulmonary testing to determine peak exercise oxygen consumption (VO2peak) and ventilatory equivalent for carbon dioxide (VE/VCO2) at the anaerobic threshold. Subsequently, cardiac MRI was performed at rest and during supine bicycle exercise with simultaneous invasive measurement of mean pulmonary arterial pressure (mPAP) before and after sildenafil.

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The average age of the patients came out within di 47.3±9.4 years. On the baseline, the average of the Qmax registered has been 15.6±3.3 mL/s, the average Qave has been 8.2±3.2 mL/s and the average resulted 32.5±11.4 mL. After the mono-administration of sildenafil 50 mg, the average Qmax value, the Qave one and the RPM one turned out into 17.7±5.1 mL/s, 10.1±3.5 mL/s and 22.6±9.6 mL. The differences within the standard values, were considered statistically relevant (P<0.05).

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The results suggest that PDE5i may increase sexual arousal by acting in the central nervous system. This effect may be mediated (at least in part) by the activation of mesolimbic dopaminergic neurons.

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We report the use of hyperbaric oxygen therapy (HBO2) in the treatment of an unusual case of secondary infertility. The patient had failed to conceive after a 1-year period of in-vitro fertilization, during which oral sildenafil had also been administered. However she became pregnant after an IVF cycle and the use of adjunctive HBO2 and sildenafil, which was administered intravaginally on this occasion. There is currently very little evidence to support the use of HBO2 in this context. The possible mechanisms of action of HBO2 in this case are discussed.

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Male ICR mice were randomized to 1 of 4 treatments: saline, sildenafil, doxorubicin (5 mg/kg IP), and sildenafil (0.7 mg/kg IP) plus doxorubicin (n=6 per group). Apoptosis was assessed with the use of terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling and in situ oligo ligation methods. Desmin distribution was determined via immunofluorescence. Bcl-2 expression was analyzed by Western blot. Left ventricular function was assessed by measuring developed pressure and rate pressure product in Langendorff mode. ECG changes indicative of doxorubicin cardiotoxicity were also measured. For in vitro studies, adult ventricular cardiomyocytes were exposed to doxorubicin (1 micromol/L), sildenafil (1 micromol/L) with or without N(G)-nitro-L-arginine methyl ester (L-NAME) (100 micromol/L), or 5-hydroxydecanoate (100 micromol/L) 1 hour before doxorubicin and incubated for 18 hours. Doxorubicin-treated mice demonstrated increased apoptosis and desmin disruption, which was attenuated in the sildenafil+doxorubicin group. Bcl-2 was decreased in the doxorubicin group but was maintained at basal levels in the sildenafil+doxorubicin group. Left ventricular developed pressure and rate pressure product were significantly depressed in the doxorubicin group but were attenuated in the sildenafil+doxorubicin group. ST interval was significantly increased in the doxorubicin group over 8 weeks. In the sildenafil+doxorubicin group, ST interval remained unchanged from baseline. Doxorubicin caused a significant increase in apoptosis, caspase-3 activation, and disruption of mitochondrial membrane potential in vitro. In contrast, sildenafil significantly protected against doxorubicin cardiotoxicity; however, this protection was abolished by both L-NAME and 5-hydroxydecanoate.

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Parkinson's disease (PD) is one of the most commonly occurring neurodegenerative disorders, with lifetime incidence between 1 and 2% among people older than 65 years. ED is one of the more disabling and poorly addressed aspects of PD. The purpose of this study was to assess the efficacy and safety of sildenafil citrate in Parkinson-emergent ED. Sexual function of participants was assessed using responses to the 15-question International Index of Erectile Function (IIEF), Sexual Encounter Profile (SEP) diary questions 2 and 3, Erectile Dysfunction Inventory of Treatment Satisfaction (EDITS) questionnaire and a Global Efficacy Question 'Has the treatment you have been taking over the study period improved your erections?' This randomized, double-blind, placebo-controlled study, comprised a screening period of at least 1 month, a placebo-lead in period of 1 week and treatment period. Two hundred thirty-six patients entered the trial. These patients had mild-to-moderate PD (stages I-III Hoehn-Yahr) and were experiencing Parkinson-emergent neurogenic ED. They were randomized to receive 100 mg sildenafil on demand 1 h before sexual activity (group 1, n=118), or similar regimen of placebo (group 2, n=118). Patients were instructed to use at least 24 doses/attempts at home. At the end of the trial, differences between sildenafil and placebo groups were significant for the IIEF erectile function (EF) score (22.6 ± 4.6 vs 14.8 ± 4.2, P=0.01), for percent Global Efficacy Question 'Yes' responses (68.1 ± 4.6 vs 12.2 ± 3.2, P=0.001), for SEP2 'Yes' responses (68.1 ± 4.2 vs 32.5 ± 2.2, P=0.003), for SEP3 'Yes' responses (75.9 ± 5.4 vs 33.5 ± 4.4, P=0.004) and for mean EDITS score (69.8 ± 4.2 vs 13.0 ± 2.7, P=0.004). A normal EF domain score (>or=26) at end point was achieved by 56.9 and 8.7% of the patients in the sildenafil and placebo groups, respectively (P=0.001). Sildenafil can be considered as an effective treatment in patients with Parkinson-emergent ED.

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We reviewed our long-term experience after oral transitioning in patients with pulmonary hypertension. Patients were weaned off parenteral therapy based on a pre-determined outpatient protocol. Data were collected retrospectively after transition had taken place.

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For this study, 42 female Wistar rats were used, and the rats were separated randomly into six groups consisting of seven rats each: sham, torsion, torsion-detorsion, torsion-detorsion + saline, torsion-detorsion + sildenafil 0.7 mg/kg and torsion-detorsion + sildenafil 1.4 mg/kg. With the exception of the sham group, an ovarian torsion procedure was implemented in all other groups for 2 h. Then, a detorsion procedure was implemented to the groups for 2 h, with the exception of the torsion group. Medications were given intraperitoneally, one-half hour before the detorsion procedure in the saline, 0.7 and 1.4 mg/kg sildenafil groups. Finally, 2 ml of blood samples was drawn for markers of oxidative stress, while the ovaries which were torsioned for the histological examination were extracted from all rats.

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Hundred and eighty men with ED and their female partners in whom sexual intercourse was satisfactory about half the time or less (score of < or =3 on the Female Partner of ED Subject Questionnaire question 3 [FePEDS Q3]).

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Although a relatively high proportion of primary care physicians have been asked by their clients to prescribe CE drugs, only a small proportion are well informed about the possibilities of CE. Since physicians are gate keepers to the medical system and have a key role regarding a drugs' prescription, objective information should be made available to physicians about biological, ethical and social consequences of CE use.

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PAH treatment at our hospital is standardized with first-line oral therapy in New York Heart Association class III patients followed by addition of prostanoids on clinical worsening.

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Women satisfaction with their sex life was improved by ED treatment (sildenafil citrate). Couple global caring seemed to amplify the well-known effect of ED treatment for men. The ISL could be a useful tool to help women in their partner's treatment and to integrate ED treatment in a couple approach.

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All treatments normalized erectile function (drop rate), and most increased the CSMC/collagen ratio and ASMA expression in corporal tissue sections, and reduced collagen content in the penile shaft. MDSC also increased nNOS and brain-derived neurotrophic factor. The combination treatment was not superior to MDSC or sildenafil given alone, and upregulated PDE5.

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A total of 144 male patients were referred for suspected drug-induced hypoglycaemia. Sildenafil and glibenclamide, or their metabolites, were detected in the urine specimens of 68 (47%) patients, none of whom had been prescribed either drug by a registered medical practitioner. Among these subjects, 24 (35%) denied any use of sexual enhancement products despite repeated questioning. Eight patients had repeated exposure resulting in re-admission. The sources of these sexual enhancement products included pharmacies in Mainland China, friends, local pharmacies, peddlers, or were unknown. Three patients died, one remains in a vegetative state and one suffered cognitive impairment; the remaining 63 recovered fully. Twenty-five unused sexual enhancement products of seven different kinds were recovered for analysis. The median (range) of sildenafil and glibenclamide per unit dose was 64 (0.05-198) mg and 70 (0-158) mg, respectively.

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Sildenafil is a selective pulmonary vasodilator in an ovine model of acute pulmonary hypertension. Sildenafil induces pulmonary vasodilation via a NO-dependent mechanism. In contrast to zaprinast, sildenafil did not prolong the pulmonary vasodilator action of inhaled NO.

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Baseline and follow-up data from 28 healthy patients presenting with erectile dysfunction after radical prostatectomy were obtained. Patients receiving any neoadjuvant/adjuvant hormones or adjuvant radiation therapy were excluded. Patients reported what their erectile status was before surgery, before sildenafil therapy, and after using a minimum of four doses of sildenafil. Both the patients and their spouses were interviewed using the Cleveland Clinic post-prostatectomy questionnaire, which includes questions about response to therapy, duration of intercourse, spousal satisfaction, side effects, and related topics. The patients were compared on the basis of the type of surgical procedure they had undergone-nerve sparing or non-nerve sparing. A positive response to sildenafil was defined as erection sufficient for vaginal penetration.

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Spray-dried chitosan/SC powder (P₁) and its gel form (G₁) could be promising wound healing promoters as supported by the histological examinations.

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Sildenafil (Viagra) has been introduced recently in market to correct male impotency and has gained immense popularity for its dramatic effects all over the world. The present study was designed to investigate the effect of sildenafil on learning and memory in mice using elevated plus maze. A total of XV groups of animals were employed in the present study. Central cholinergic pathways play a crucial role in learning and memory processes. Physostigmine, an anticholinesterase agent (0.5 mg, 1.0 mg kg(-1), i.p) was employed for its memory enhancing property and alprazolam a benzodiazepine receptor agonist served as a memory-impairing agent. In the present study, alprazolam produced anterograde amnesia (at 0.5 mg kg(-1), i.p) and retrograde amnesia (at 0.25 mg, 0.5 mg, 0.75 mg kg(-1), i.p.) in separate groups of animals. Caffeine at 5 mg, 10 mg and 20 mg kg(-1), i.p. (an established psychostimulant) did not show any significant change in learning and memory of mice. Sildenafil (at 8 mg kg(-1), i.p.) administered 30 minutes prior to training on first day produced a marginal decrease in transfer latency time on first day; whereas, sildenafil (at 2 mg, 4 mg, 8 mg kg(-1), i.p.) administered immediately after training on first day produced a dose-dependent improvement of memory in mice. However, further studies need to be carried out to elucidate the underlying mechanism of sildenafil as a memory enhancer.

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Compared with the 274 patients receiving placebo, the 279 receiving sildenafil reported significantly greater mean and median improvements (P < 0.001) in each of the 14 SEAR items. The probability of increased psychosocial benefit from baseline to week 12 was higher with sildenafil for each SEAR item, and ranged from 0.60 ('My partner was unhappy with the quality of our sexual relations'[item reverse-scored]) to 0.72 ('I was satisfied with my buy viagra online sexual performance'). Across all items, the mean (sd) probability was 0.67 (0.04) that a randomly selected patient in the sildenafil group would have a more favourable change relative to a randomly selected patient in the placebo group.

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Expression of one's sexuality is a fundamental mental health need of all individuals, regardless of age and gender. While the popularity and widespread use of Viagra and similar medications for male erectile dysfunction have helped many individuals, it has also reinforced a more male dominated view of sexuality-one that focuses more on genital function, and less on the relationship and issues of intimacy and meaning. Highlighting important issues and recent trends, the paper provides an overview of the diagnosis, description, etiology, assessment and treatment of women's sexual problems. A broad perspective on sexuality is emphasized, along with an understanding of the sexual response cycle. A selected review of the literature on older women and sexual dysfunction buy viagra online shows wide variability and the important role of biomedical, health and relational factors. In working with the sexual needs of older women, any therapeutic intervention should be based upon a solid understanding of the myths and realities of the sexual aging process, a keen understanding of the sexual challenges faced by older women, and a respect for the continuity of one's sexual lifestyle.

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18 internationally published clinical studies that enrolled SCI males treated with at least one of the buy viagra online PDE5 inhibitors were analyzed.

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Report of two cases and review of FDA postmarketing buy viagra online data.

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NO/cGMP signaling plays an important role in vascular relaxation and regulation of blood pressure. The key enzyme in the cascade, the NO-stimulated cGMP-forming guanylyl cyclase exists in two enzymatically indistinguishable isoforms (NO-GC1, NO-GC2) with NO-GC1 being the major NO-GC in the vasculature. Here, we studied the NO/cGMP pathway in renal resistance buy viagra online arteries of NO-GC1 KO mice and its role in renovascular hypertension induced by the 2-kidney-1-clip-operation (2K1C). In the NO-GC1 KOs, relaxation of renal vasculature as determined in isolated perfused kidneys was reduced in accordance with the marked reduction of cGMP-forming activity (80%). Noteworthy, increased eNOS-catalyzed NO formation was detected in kidneys of NO-GC1 KOs. Upon the 2K1C operation, NO-GC1 KO mice developed hypertension but the increase in blood pressures was not any higher than in WT. Conversely, operated WT mice showed a reduction of cGMP-dependent relaxation of renal vessels, which was not found in the NO-GC1 KOs. The reduced relaxation in operated WT mice was restored by sildenafil indicating that enhanced PDE5-catalyzed cGMP degradation most likely accounts for the attenuated vascular responsiveness. PDE5 activation depends on allosteric binding of cGMP. Because cGMP levels are lower, the 2K1C-induced vascular changes do not occur in the NO-GC1 KOs. In support of a higher PDE5 activity, sildenafil reduced blood pressure more efficiently in operated WT than NO-GC1 KO mice. All together our data suggest that within renovascular hypertension, cGMP-based PDE5 activation terminates NO/cGMP signaling thereby providing a new molecular basis for further pharmacological interventions.

viagra recommended dosage 2015-10-02

The impact of treatment on psychosocial factors associated with ED was determined by patient responses to the SEAR questionnaire. Erectile function was determined using the International Index of Erectile Function (IIEF) and a global efficacy question. Successful sexual intercourse attempts were buy viagra online derived from event logs of sexual activity. Treatment effect sizes were calculated for all study outcomes.

viagra brand name 2016-08-18

At the time when antibiotics and other pharmacy products did not exist, a bulb of garlic itself represented a whole pharmacy industry due to the broad buy viagra online spectrum of effects. Most different suppositions involving this herb are mentioned; some of them were so pointless that they disappeared in time, but some of them have remained until the present days. The garlic was given different names that are still in use such as 'Russian penicillin', 'natural antibiotic', 'vegetable viagra', 'plant talisman', 'rustic's theriac', 'snake grass' etc. Presentation of the development of ideas associated with garlic and the evolution of the notions increased the ability of the pharmacists and physicians to respond to the challenges of their professional services in facilitating human life.

viagra 50mg online 2015-07-03

Infants and children ages 0-11 yrs with CDH (n = 3) or CCAM (n = 1) with evidence of chronic buy viagra online pulmonary hypertension by echocardiogram and cor pulmonale (n = 3).

viagra 80 mg 2016-04-30

Sildenafil significantly modified the baseline punctuation of the LISAT 8 from a crude value of 30.2 (5.9) pts (mean [standard deviation]), at baseline, to 34.7 (5.6) pts after treatment., and from 55.4% (14.7%) to 66.8% (14.3%) in standardized punctuation (p < 0.0001 in both cases). Sildenafil responders showed a response increase of the total punctuation which was significantly higher than non-responders: 12.5% versus 4.3% (p < 0.001). MID was 3.2 pts as crude punctuation, and 8.1% in normalized score. Statistically buy viagra online significant correlations were found between changes in LISAT-8 and changes in IIEF.

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The EF status was evaluated before and at the end buy viagra online of the treatment by International Index of Erectile Function questionnaire and penile Doppler ultrasonography (PDU).

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Among 1,427 participants enrolled, 53 HIV seroconverters were identified by June 2007. At baseline, 62.7% reported using illicit drugs in the previous 6 months, including 10.7% who reported at least weekly use. Illicit drug use was associated with unprotected anal intercourse with casual partners (P < 0.001). Use of illicit drugs was associated with increased risk of HIV infection at a univariate level, and this risk increased with greater frequency of use. This was also true of the use of OEM. Use of each type of illicit drug was included in multivariate analysis, and after controlling for sexual risk behaviors, only use of OEM buy viagra online remained significantly predictive of HIV infection (Hazard ratios [HR] = 1.75, CI = 1.31-2.33, P < 0.001), although amyl nitrite was of borderline significance (HR = 1.26, CI = 0.98-1.62, P = 0.074).

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In a prospective interventional study, 8 healthy subjects (4 men and 4 women) with no ocular history underwent enhanced depth imaging spectral-domain optical coherence tomography at baseline, 1 hour, and 3 hours after the ingestion of buy viagra online 100 mg of sildenafil citrate. Choroidal thickness measurements for both eyes using enhanced depth imaging spectral-domain optical coherence tomography were taken by 2 masked readers at baseline, 1-hour, and 3-hour time points. Statistical analysis was performed to compare the measurements of choroidal thickness at each of the three intervals.

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The adverse reactions most commonly observed were flushing (30.8%), headache (25 Atarax Usual Dosage . 4%), nasal congestion (18.7%), and heartburn (10.5%). All events were short lived and mild in nature. In the present study, 31.6% of patients experienced one or more adverse events. However, no one withdrew from the study because of the severity of these events. There was a significant association between higher doses and the occurrence of side effects.

sildenafil generic viagra 2017-04-15

This article briefly reviews the background of endothelium-dependent vasorelaxation, describes the nitric oxide/cGMP/protein Plavix 20 Mg kinase pathway and its role in modulating pulmonary vascular tone and remodeling, and describes three approaches that target the nitric oxide/cGMP pathway in the treatment of patients with pulmonary arterial hypertension.

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The major findings of this Clomid Buy study are as follows: (1) sildenafil improved post-resuscitation perfusion of the heart, and thus reduced cardiac myocyte apoptosis and improved cardiac function; (2) sildenafil treatment inhibited the increases in the microRNA-1 levels, but alleviated the decreases in the microRNA-133a levels.

viagra typical dosage 2016-03-31

Flow-mediated dilatation (FMD), induced by occlusion of the brachial artery, is an index of nitric oxide-dependent endothelial function that is impaired in patients with type 2 diabetes. Sildenafil (Viagra) is an inhibitor of phosphodiesterase 5 (PDE-5), which is used for management of erectile dysfunction in Cleocin 600 Mg a broad range of patients, including those with type 2 diabetes. Its effects on endothelial function in these patients have not been previously assessed.

viagra type drugs 2016-04-10

We examined and compared the efficacy of sildenafil in patients previously using other Epivir Drug Interactions agents or devices for erectile dysfunction (ED) treatment.

viagra 70 mg 2017-12-20

To evaluate the effect Trental Dosing of diabetes mellitus and of sildenafil citrate on female urethral function.

buy generic viagra 2017-09-25

Fifty-six percent of Internet requests came from 46 states, and 44% from eight foreign countries. Of 2,104 requests, 2,100 were granted. Three hundred ten patients have requested medication refills: all reported erections sufficient for intercourse and 69% said their satisfaction exceeded all expectations; none were at all dissatisfied. Side effect rates were comparable to those in the literature. Comparison of the medical history obtained from Internet patients with that recorded in clinic patients' charts revealed that the former was far more complete. No clinic patient received any examination or laboratory test specific for erectile dysfunction or its causes. There were no reported deaths or serious complications in either Generic Zantac Cost group.

viagra generic price 2015-01-19

Mammalian circadian rhythms are generated by a master clock located in the suprachiasmatic nuclei and entrained by light-activated signaling pathways. In hamsters, the mechanism responsible for light-induced phase advances involves the activation of guanylyl cyclase, cGMP and its related kinase (PKG). It is not completely known whether interference with this pathway affects entrainment Benicar Tab 40mg of the clock, including adaptation to changing light schedules. Here we report that cGMP-specific phosphodiesterase 5 is present in the hamster suprachiasmatic nuclei, and administration of the inhibitor sildenafil (3.5 mg/kg, i.p.) enhances circadian responses to light and decreases the amount of time necessary for reentrainment after phase advances of the light-dark cycle. These results suggest that sildenafil may be useful for treatment of circadian adaptation to environmental changes, including transmeridian eastbound flight schedules.

medicine viagra 2017-09-24

Satisfaction with the sexual experience is considered important when evaluating the impact of treatments for erectile dysfunction, yet enhanced satisfaction has been infrequently assessed in the sexual trials. We evaluated the efficacy of sildenafil vs. tadalafil, in Saudi men with erectile dysfunction and determined the self-based rating of medicinal preference. Sildenafil citrate (Viagra) is a potent inhibitor of the electrolytic enzyme type V phosphodiesterase (PDE5), in the corpus cavernosum and therefore increases the penile response to sexual stimulation. Tadalafil (Cialis) is also a PDE5 inhibitor that increases the level of cyclic guanosine monophosphate (cGMP) in cavernous smooth muscle cells. Whereas cGMP is a second messenger for the vasodilator effects of nitric oxide causing smooth muscle relaxation, which in turn leads to penile erection; however the mechanism by which cGMP stimulates relaxation of the smooth muscles remains to be elucidated. Both sildenafil and tadalafil have a rapid onset with the effectiveness up to 4 hours and 36 hours respectively. In this study subjects treated with 100 mg oral dose of sildenafil / 20 mg tadalafil were found to be associated with higher mean scores for the questions of the International Index of Erectile Function (IIEF). Frequency of penetration and maintenance of erection after sexual penetration and/or during masturbation were found to be enhanced significantly (p<0.001) in both sildenafil/tadalafil treated men. Similarly mean domain of erectile function, orgasmic function, and intercourse satisfaction also showed a significantly positive improvement (p/0.001) in both the treated groups in comparison with their age matched untreated controls. Interestingly in all the cases, tadalafil group showed considerably greater positive responses than the sildenafil group but within the same significant levels. Strikingly the sexual-desire domain in sildenafil treated men with respect to their aged matched controls showed a non-significant difference, where as this difference was found to be highly significant in tadalafil treated group. Similarly mean scores for the overall satisfaction domains of the IIEF in comparison with the untreated subjects showed a significant positive response in the sildenafil treated group (p<0.001), where as tadalafil treated group showed a highly significant positive response (p<0.005). These findings suggest that both sildenafil and tadalafil may assist an individual in Paracetamol Overdose Treatment extending/enhancing the excitement phase or prolonging the sexual interaction. These studies further conclude that there is a major point of difference between the short-acting agent sildenafil and the longer acting tadalafil. This probably allows more choice about the onset of sexual responses with tadalafil than with sildenafil.

viagra dosage instructions 2015-12-14

Oral sildenafil and intravenous epoprostenol have independently been shown to be effective in patients with pulmonary Lasix 500mg Tablet arterial hypertension.

viagra prescription cost 2015-05-25

For physicians to practice Glucotrol 20 Mg optimal therapeutics, adequate, clinically relevant drug information is required. Several brief changes and additions in the sildenafil product information would assist physicians in making therapeutic decisions regarding the use of sildenafil in a very diverse patient population and in avoiding preventable adverse events.

viagra compare cost 2016-07-11

Records of 216 children with idiopathic pulmonary arterial hypertension (IPAH) and associated pulmonary arterial hypertension (APAH) were reviewed. Kaplan-Meier survival curves were constructed for different diagnostic groups and Imitrex 25 Mg for different therapies.

1 viagra pill 2015-03-04

Pulmonary arterial hypertension (PAH) is an increasingly recognised serious illness with insidious onset, delayed diagnosis, complex diagnostic algorithms and poor prognosis, but with recently available effective treatments.

discount viagra drug 2017-10-09

Erectile dysfunction (ED) is associated with an incremental inflammatory activation. Evidence suggests that chronic phosphodiesterase 5 (PDE-5) inhibition may have a favorable effect on inflammatory activation and surrogate markers of ED. The aim of this study is to investigate the acute effect of sildenafil on circulating pro-inflammatory markers/mediators in ED patients.

viagra drug class 2017-05-12

Patients with recurrent ischemic priapism have historically been treated with anti-androgen therapy due to the limited available evidence for more targeted therapies to treat the underlying pathophysiologic mechanisms of this condition. We report a case in which anti-androgen therapy caused significant adverse side effects and likely masked this patient's elevated prostate-specific antigen (PSA) levels, which adversely impacted the timely diagnosis and treatment of his prostate cancer.

viagra prescription online 2016-06-11

A sexual marathon is defined as prolonged sexual activity over hours and even days. This exploratory study examined the phenomenon of sexual marathons in a sample of 341 HIV-positive methamphetamine-using men who have sex with men (MSM). Eighty-four percent of the men reported engaging in marathon sex while high on methamphetamine. MSM who engaged in sexual marathons and those who did not were compared in terms of background characteristics, methamphetamine use variables, alcohol and illicit drug use, sexual risk behaviors, and psychosocial factors. Men who engaged in marathon sex used significantly more illicit drugs, were more likely to use sildenafil (Viagra) and amyl nitrates, and scored higher on a sexual compulsivity scale compared to men who did not engage in marathon sex. In multivariate analyses, use of sildenafil in the past two months was significantly correlated with participation in sexual marathons. Findings are discussed in terms of their implications for HIV/STI prevention and intervention.

viagra generic cost 2017-01-21

These results suggest that biochemically and histologically torsion/detorsion injury occurs in the contralateral testis following 2-h torsion and 2-h detorsion and that administration of low-dose sildenafil citrate before detorsion prevents ischemia/reperfusion cellular damage in testicular tissue.

viagra 25mg online 2016-04-10

This study indicates that further research on the therapeutic effect of sildenafil citrate can be combined with the use of any apoptosis-blocking agent for the treatment of cerebral vasospasm following experimental subarachnoid hemorrhage.