If you have an erection that lasts for more than 4 hours, you should go to the nearest hospital emergency department. Tell your doctor if any of these symptoms are severe or do not go away: headache. Population pharmacokinetic data from patients in clinical trials also indicated a reduction in sildenafil clearance when it was co-administered with CYP3A4 inhibitors such as ketoconazole, erythromycin, or cimetidine [see Dosage and Administration 2. Effects of VIAGRA on Vision: At single oral doses of mg and mg, transient dose-related impairment of color discrimination was detected using the Farnsworth-Munsell hue test, with peak effects near the time of peak plasma levels. The titration studies, in which most patients received mg, showed similar results.AdEnjoy Greater Libido & Performance. Fast Express test1.ruries: Aphrodisiacs, Best Sellers, Energy, Herbal Incense, Herbal Tea and more. About sildenafil (Viagra) Sildenafil is a medicine used to treat erection problems (erectile dysfunction). Sildenafil is also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). If you have erection problems sildenafil works by temporarily increasing blood flow to your penis when. AdGet a Prescription for ED treatment, discreetly deliverED to your door.

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