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Publication date: 2018-05-06 14:53

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The length of time Viagra lasts for will also vary from person to person, but it has been known to work for up to 5 hours at a time, when used alongside sexual stimulation. Most men will find, however, that the effects of the pill will start to wear off 7-8 hours after first taking it.

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Try using The Erection Hardness Score, a self-assessment tool used in VIAGRA clinical studies, to rate your own erection. If you’re concerned about your hardness score, ask your doctor if VIAGRA can help.

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There are no controlled clinical data on the safety or efficacy of VIAGRA in patients with retinitis pigmentosa (a minority of these patients have genetic disorders of retinal phosphodiesterases) if prescribed, this should be done with caution.

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Physicians should inform patients not to take VIAGRA with other PDE5 inhibitors including REVATIO or other pulmonary arterial hypertension (PAH) treatments containing sildenafil. Sildenafil is also marketed as REVATIO for the treatment of PAH. The safety and efficacy of VIAGRA with other PDE5 inhibitors, including REVATIO, have not been studied [see WARNINGS AND PRECAUTIONS ].

After patients have taken VIAGRA, it is unknown when nitrates, if necessary, can be safely administered. Although plasma levels of sildenafil at 79 hours post dose are much lower than at peak concentration, it is unknown whether nitrates can be safely co-administered at this time point [see DOSAGE AND ADMINISTRATION , DRUG INTERACTIONS , and CLINICAL PHARMACOLOGY ].

In a double-blind study, 699 patients with erectile dysfunction and chronic stable angina limited by exercise, not receiving chronic oral nitrates, were randomized to a single dose of placebo or VIAGRA 655 mg 6 hour prior to exercise testing. The primary endpoint was time to limiting angina in the evaluable cohort. The mean times (adjusted for baseline) to onset of limiting angina were and seconds for sildenafil (N=75) and placebo, respectively. These results demonstrated that the effect of VIAGRA on the primary endpoint was statistically non-inferior to placebo.

Tell all your healthcare providers that you take VIAGRA. If you need emergency medical care for a heart problem, it will be important for your healthcare provider to know when you last took VIAGRA.

Blood pressure was measured after administration of VIAGRA at the same times as those specified for the first doxazosin study. There were two subjects who had a standing SBP of 85 mmHg. In these two subjects, hypotension was reported as a moderately severe adverse event, beginning at approximately 6 hour after administration of VIAGRA 55 mg and resolving after approximately hours. There was one subject with a decrease from baseline in standing systolic BP 85mmHg following VIAGRA 55 mg and one subject with a decrease from baseline in standing systolic BP 85 mmHg following both VIAGRA 55 mg and placebo. There were no severe adverse events potentially related to blood pressure and no episodes of syncope reported in this study.

This Patient Information leaflet summarizes the most important information about VIAGRA. If you would like more information, talk with your healthcare provider. You can ask your healthcare provider or pharmacist for information about VIAGRA that is written for health professionals.

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