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This dropped to 23 mins if they’d taken it 8 hours beforehand and 16 mins if they took it 12 hours beforehand. viagra overdose side effects Sildenafil is a medicine used to treat erectile dysfunction. It increases blood flow to the penis to help men get an erection. At least two-thirds of men have improved erections after taking it. Sildenafil is also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). This medicine is available on prescription and can also be bought from most pharmacies. It comes as tablets that you swallow, chewable tablets, and as a liquid that you drink. Sildenafil for erectile dysfunction (Viagra) can be taken by men aged 18 and over. Sildenafil for pulmonary hypertension (Revatio) can be taken by adults and children aged 1 and over. Do not take sildenafil if you: You can get sildenafil on the NHS if you have erectile dysfunction or pulmonary hypertension. 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Talk to your doctor about the possible side effects of VIAGRA®. kamagra best price Learn about Viagra Sildenafil Citrate may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related medications. It is a PDE5 inhibitor that works by facilitating blood flow to the penis, and. Sildenafil's short duration does make it a good starting ED medicine.