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Tell your doctor or pharmacist if the advice on how to cope does not help or the side effects get worse. Headaches should usually go away after the first week of taking sildenafil. Talk to your doctor if they last longer than a week or are severe. Common side effects of sildenafil happen in more than 1 in 100 people.

The major circulating metabolite results from N-demethylation of sildenafil. This metabolite has a phosphodiesterase selectivity profile similar to sildenafil and an in vitro potency for PDE5 approximately 50% that of the parent drug. Plasma concentrations of this metabolite are approximately 40% of those seen for sildenafil. The N-desmethyl metabolite is further metabolised, with a terminal half-life of approximately 4 h. When sildenafil is taken with food, the rate of absorption is reduced with a mean delay in tmax of 60 minutes and a mean reduction in Cmax of 29%. In cases of overdose, standard supportive measures should be adopted as required.

Other treatments for ED include topical applications, Viagra 25 mg injections into the penis, surgical devices, penis pumps, and counselling. Other oral ED drugs work in a similar way, with similar side effects. Viagra was the first drug in this class to become widely prescribed.

Avoid consumption of alcohol as it may impair your ability to get an erection. Taking SILDENAFIL after a heavy meal might take longer time for the medicine to work