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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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We developed an in vitro method that allows us to study the physiopharmacological responses of penile resistance arteries under isobaric conditions.

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Sildenafil and other PDE-5 inhibitors have revolutionized erectile dysfunction (ED) treatment. However, a significant number of patients do not respond or present adverse reactions to these drugs. While genetic polymorphisms may underlie this phenomenon, very little research has been undertaken in this research field. Most of the current knowledge is based on sildenafil, thus almost completely ignoring other important pharmacological therapies. Currently, the most promising genes with pharmacogenetic implications in ED are related to the nitric oxide and cGMP pathway, although other genes are likely to affect the responsiveness to treatment of ED. Nevertheless, the small number of studies available opens the possibility of further exploring other genes and phenotypes related to ED. This article provides a comprehensive overview of the genes being tested for their pharmacogenetic relevance in the therapy of ED.

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The observed increases in SNP- and sildenafil-induced responses, along with the decreased EFS-mediated responses, suggest increased sensitivity in the NO-signalling pathway following l-DOPA administration.

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As expected, the untreated SHR had endothelial dysfunction and a steady increment of the blood pressure. In contrast, chronic sildenafil administration reversed endothelial dysfunction, reduced renal oxidative stress and renal macrophage accumulation, and ameliorated the severity of hypertension in SHR.

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In our opinion, as indicated by our examples, a better balance should be struck between the development of orphan drugs along the recently established regulatory pathways and the pragmatic use of pharmacy-compounded products and evidence-based off-label use of already available commercial products. Societal needs would be best met by focusing orphan drug development on rare diseases for which there is a high unmet medical need.

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The main clinical, cultural, and demographical factors to be considered for the treatment of ED have been identified.

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We describe the pharmacological characteristics of a novel phosphodiesterase type 5 inhibitor FR226807, N-(3,4-dimethoxybenzyl)-2-[[(1R)-2-hydroxy-1-methylethyl]amino]-5-nitrobenzamide. FR226807 inhibited phosphodiesterase type 5 isolated from human platelets with an IC(50) value of 1.1 nM. FR226807 also inhibited phosphodiesterase type 6 with an IC(50) of 20 nM; however, the IC(50) value for phosphodiesterase type 6 was 18-fold higher than that for phosphodiesterase type 5. The IC(50) values of FR226807 for other phosphodiesterases (phosphodiesterase type 1, phosphodiesterase type 2, phosphodiesterase type 3, and phosphodiesterase type 4) were 1000-fold higher than that for phosphodiesterase type 5. FR226807 increased the cyclic guanosine monophosphate (cGMP) content in corpus cavernosum isolated from rabbit, an effect associated with relaxation of the muscle. FR226807 enhanced the relaxation response induced by electrical field stimulation of corpus cavernosum isolated from the rabbit. In an anesthetized dog model for the evaluation of erectile function, intravenous administration of FR226807 prolonged the time to return to 75% of maximal intracavernosal pressure after cessation of electrical stimulation of the pelvic nerve. In summary, FR226807 is a potent and highly selective phosphodiesterase type 5 inhibitor with an augmentative effect on penile erection and will be useful for the treatment of erectile dysfunction.

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This work describes uniform polymer coatings allowing for an adjustment of the orifice dimension of vibrating-mesh nozzles and therefore, size of emerging formulation droplets and dried particles, which is of general interest for diverse spray-drying applications. Chemical vapor deposition of poly(p-xylylene) (PPXN) on aperture templates of the B-90 spray-dryer (orifice diameters: ∼4.0μm) caused a reduction of the opening cross-sections of ∼50%. Thus, a more efficient formulation atomization was observed (finer droplets). Likewise, application of PPXN-coated, rather than plain nozzles, resulted in significantly smaller (particle diameter: 1.3 vs. 3.6μm) and narrower distributed (span: ∼1.4 vs. ∼1.8) sildenafil-loaded poly(lactide-co-glycolide) microparticles. Prediction of the size of spray-dried microparticles using the size results of atomized droplets ("residual core method") was shown to be in agreement with the observed values. Formulations prepared with plain and PPXN-coated nozzles exhibited a sustained sildenafil release profile with mean dissolution times of ∼1.5 and ∼4.0h, respectively. Regardless of the starting aperture template, any desired orifice dimension and therefore, dried particle size could be achieved by generating adequate polymer deposits.

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A randomised controlled trial with 27 men planned for radiation treatment for localised prostate cancer recruited from a single radiotherapy centre in Australia. Men were randomised to receive daily sildenafil, or a placebo tablet, for 6 months. The primary end-point was erectile function, as measured by the International Index of Erectile Function (IIEF) score, at 2-year follow-up. The abridged IIEF-5 survey was also used during the treatment period, and could be derived from the full IIEF at other time-points. Two-sided Student's t-tests and Mann-Whitney U-tests were used for the analysis of continuous outcomes, with Fisher's exact test for dichotomous outcomes.

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Pulmonary arterial hypertension is a progressive disease that has a high rate of mortality. For these reasons, early treatment is essential. Treatment choices for pulmonary arterial hypertension are limited by drug tolerability, drug cost and inconvenience associated with administration techniques and dosing schedules. Therefore, a therapy that provides oral dosing with limited side effects would prove useful in managing many patients. Sildenafil citrate, the first and highly publicized oral medication to receive approval from the U.S. Food and Drug Administration for erectile dysfunction, has recently been approved for treatment of pulmonary arterial hypertension. This review summarizes the normal physiology of the pulmonary vasculature, and the pathophysiology involved in pulmonary arterial hypertension and the role of sildenafil in its treatment.

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The purpose of this study was to review the patient characteristics and management of 56 cases of high altitude pulmonary edema at the Pheriche Himalayan Rescue Association Medical Aid Post, and to measure the use of medications in addition to descent and oxygen.

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In humans, oral sildenafil induces potent protection against IR-induced endothelial dysfunction through opening of K(ATP) channels. Further studies are needed to test the potential clinical implications of this finding.

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Sildenafil is an effective and well-tolerated agent for the treatment of ED in renal transplant recipients.

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We found that PDE5 activity (but not expression) is increased after SAH, leading to decreased cGMP levels. Sildenafil attenuates this increase in PDE5 activity and restores cGMP levels after SAH. Post-SAH initiation of sildenafil was found to decrease vasospasm and neuronal cell death and markedly improve neurological outcome without causing significant physiological side effects.

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buy viagra online 2015-12-03

Patients awaiting HT were submitted to the measurement of systemic and pulmonary hemodynamic variables before viagra buy and after the administration of a single sublingual dose of 100 mg of sildenafil during right heart catheterization.

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Male Wistar rats (n = 8 per group) were randomized and anesthetized with pentobarbital (90 mg/kg). Hearts were isolated, mounted on a Langendorff system and perfused with Krebs-Henseleit buffer at a constant pressure of 80 mmHg. Hearts underwent 30 min of global ischemia followed by 60 min of reperfusion. At the end of the experiments infarct size was determined by TTC staining. In the control group rats were not further treated. Sildenafil (3 μM) was administered over 10 min before the beginning of ischemia. The mBKCa channel inhibitor paxilline (1 μM) was administered with and without sildenafil before the onset of ischemia. The pathway underlying sildenafil-induced cardioprotection was further investigated with the protein kinase G blocker KT5823 (1 μM). Myocardial cGMP concentration was measured by ELISA. Data (mean±SD) were analysed with a one viagra buy and two-way analysis of variance as appropriate.

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The age average of the 44 cases included was 32.04 3.15 years. Both groups present a statistically significant decrease, Nexium Dosage Otc between the first and the second medical examination, in IPSS, NIH-CPSI scores and statistically significant increase in IIEF-5 score. In addition, there is no statistically significant difference, in all scores, between mono and combination therapy.

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Rats fed with ethanol and a nutritious diet intragastrically develop liver pathologic changes associated with cyclic elevation of blood and urinary ethanol levels (BAL and UAL cycle). At the peaks of the UAL cycle, the livers are hypoxic. When the liver portal hepatic blood flow is temporarily clamped for 2 min and then released, the livers at the peak UAL fail to recover completely compared to the control livers and the livers at the UAL cycle troughs. Viagra was fed to the ethanol-fed rats to enhance the effects of nitric oxide. Since nitric oxide is known to increase hepatic blood flow, it was anticipated that Viagra would prevent the liver hypoxia at the UAL cycle peaks and also improve the post-clamp recovery from the post-clamp ischemia challenge. Viagra tended to improve the post-clamp recovery of the liver surface pO2 levels of the ethanol-fed rats probably by slowing O2 consumption as Sporanox 100mg Capsule result of NO inhibition of mitochondrial cytochrome c oxidase activity. However, Viagra increased the pathology score when fed with ethanol. For this reason, Viagra is a two-edged sword. On the one hand, it tended to be protective in the post-ischemic injury in the ethanol-fed rats and on the other hand, it enhanced the liver injury caused by ethanol. Viagra did not affect the UAL cycle.

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: In 8 of 11 cases, patients stopped sildenafil therapy when CSC occurred. In 6 of these 8 cases, patients' vision improved after Stromectol Dosing Instructions sildenafil cessation. In 3 cases, effects recurred when patients resumed sildenafil therapy, but stopping therapy was not associated with improvement of CSC in every case. Two patients continued to experience CSC after sildenafil cessation.

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This study did not show a benefit for sildenafil for the primary outcome. The presence of some positive secondary outcomes creates Antabuse Alcohol clinical equipoise for further research. (Funded by the National Heart, Lung, and Blood Institute and others; ClinicalTrials.gov number, NCT00517933.)

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To evaluate the preconditioning effect of sildenafil administered preoperatively in kidneys subjected to Flagyl 400 Dose a period of warm ischemia (WI), hypothermic perfusion (HP) or cold storage (CS) and finally, autotransplant (AT).

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Doppler velocimetry index values reflect decreased placental bed vascular resistance after Sildenafil. Avapro 40 Mg Sildenafil citrate can improve fetoplacental perfusion in pregnancies complicated by intrauterine growth restriction. It could be a potential therapeutic strategy to improve uteroplacental blood flow in pregnancies with fetal growth restriction (FGR).

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Coronary heart disease is the major cause of morbidity and mortality in the elderly population in the United States, affecting both men and women. Advances in cardiac therapies have enabled cardiac patients to remain both physically and sexually active even into their eighties and nineties. However, both patients and Aciphex Like Drugs physicians are reluctant to discuss sexual issues. A significant number of patients will have sexual dysfunction following a diagnosis of cardiovascular disease. It is therefore imperative that physicians initiate discussions regarding sexual activity and potential risks to the patient such as myocardial infarction, sudden death, and arrhythmia. Risk stratification based on objective criteria and in particular cases, functional testing, may be useful in counseling patients regarding individual risk. Newly available pharmacologic therapies such as sildenafil may be useful, but must be used with caution in patients with known cardiovascular disease.

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Thirty-one patients who had received external beam radiation and nineteen patients who had received brachytherapy for prostate cancer and were subsequently treated with sildenafil citrate for post-irradiation ED comprised the patient population. A Imitrex Generic Cost chart analysis was performed to determine either the presence or absence of concomitant risk factors for ED (coronary artery disease, diabetes, hypertension and smoking history) as well as age at radiation and time lapse between radiation completion and sildenafil citrate administration. Patients were then contacted to ascertain sildenafil citrate efficacy (defined as the continued use of sildenafil citrate), dosage used and medication tolerance.

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Swimming-induced pulmonary edema (SIPE) occurs during swimming or scuba diving, often in young individuals with no predisposing conditions, and its pathophysiology is poorly understood. This study tested the hypothesis that pulmonary artery and pulmonary artery wedge pressures are higher in SIPE-susceptible individuals during submerged exercise than in the general population and are reduced by sildenafil.

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Of the various methods of hemodynamic studies performed to evaluate erectile dysfunction penile color Doppler ultrasound is currently considered the best. However, intracavernous injection is invasive and has adverse effects, such as prolonged erection. We evaluated whether sildenafil may be used as a substitute for intracavernous agents when assessing impotence on color Doppler ultrasound.

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Healthy volunteers in an academic research environment.

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Sexual enhancement medication presents a large market for counterfeit versions. We report here a case of hypoglycemia caused by an illicit sexual enhancement medication containing an extremely large amount of the sulfonylurea drug glibenclamide together with a moderate amount sildenafil citrate.

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Chronic prostatitis is a common urological complaint without clearly defined causation or definitive treatment.

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Twenty-one percent of male and 43% of female participants lost a spouse during the 9-year study period. Only 0.65% of men and 0.97% of women were diagnosed with an STI. Widowhood was associated with an increased risk of STI diagnosis for men only, with the largest effects found 0.5 to 1 year after a wife's death. Effects for men were larger after the introduction of sildenafil.

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The results showed that the score of international index of erectile function 5 (IIEF5) were elevated from 8.87 +/- 4.10 to 17.24 +/- 6.17 after treatments (p< 0.0001, Student' s t test). The efficacy rates for ED were 81.6% in sil and 81.6% in var, respectively. The adverse reactions rates such as headache, burning, palpitation, etc. were 13.6% in sil and 5.6% in var, which is significantly higher in sil (p = 0.032; chi2 test). These side effects were not serious at all, and there were no cases that gave up to use PDE5 inhibitors because of adverse reactions. According to individual patients experiences, 40.7% of patients preferred sil, 45.4% choose var. In addition, associated effects for quality of life (QOL) of ED patients treated by PDE5 inhibitors were analyzed. The results revealed that encouraging in life 46.5%, rejuvenation feeling 45.1%, self care for their health 28.2%, improvement of depression 12.7%, improvement of voiding dysfunction 5.6%, intimacy with partner 38.0%, good conversation with partner 18.3%, and so on.

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The therapeutic and commercial success of phosphodiesterase 5 inhibitors such as Viagra, Levitra and Cialis has sparked renewed interest in the phosphodiesterases as drug discovery targets. Virtually all the phosphodiesterases are expressed in the CNS, making this gene family a particularly attractive source of new targets for the treatment of psychiatric and neurodegenerative disorders. Significantly, all neurons express multiple phosphodiesterases, which differ in cyclic nucleotide specificity, affinity, regulatory control and subcellular compartmentalization. Therefore, phosphodiesterase inhibition represents a mechanism through which it could be possible to precisely modulate neuronal activity. In this article, we review the current state of the art in the burgeoning field of phosphodiesterase pharmacology in the CNS.

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PDGF increased cell proliferation and the percentage of cells in S phase. These effects were inhibited by pretreatment with sildenafil in a dose-dependent manner. Sildenafil (96 microM) also caused a 67% decrease in PDGF-stimulated ERK1/2 phosphorylation. Sildenafil inhibition of ERK1/2 was accompanied by a rapid induction of MKP-1. Inhibition of the cGMP-dependent kinase I alpha (cGK I alpha) using Rp-8-BrcGMPS (25 microM) blocked sildenafil-induced MKP-1 expression. Either vanadate (12.5 microM), a phosphatase inhibitor, or Rp-8-BrcGMPS abolished the inhibitory effect of sildenafil on PDGF-stimulated phosphorylation of ERK1/2 and restored PDGF-induced cell proliferation.