These medicines all work well for ED. If you are taking sildenafil for erectile dysfunction, you are unlikely to miss a dose since this medication is taken as needed, not on a regular dosing schedule. If you have erection problems sildenafil works by temporarily increasing blood flow to your penis when you get sexually excited. Sildenafil is also used in both men and women to treat the symptoms of pulmonary arterial hypertension. Do not take more or less of it or take it more often than prescribed by your doctor.The Savings Offer and Program expire on 12/31/ For further information, call , visit test1.ru, or write: Viatris Inc., P.O. Box , Mission, KS Eligible patients may save on their VIAGRA® (sildenafil citrate) prescription with the VIAGRA savings card. Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to absorb it after a high-fat meal or alcohol. Its effects . Teva sildenafil is a generic version of Viagra that treats erectile dysfunction (ED) and heart conditions like pulmonary arterial hypertension (PAH). Viagra is so popular that its name .