These are commonly prescribed for an enlarged prostate or male pattern baldness. Make sure you have discussed any other medications you are currently taking or plan to take before starting sildenafil with your doctor and pharmacist. They’re often the first line of treatment for trouble getting or keeping an erection, called erectile dysfunction ED. Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you take. Sexual activity may be a strain on your heart, especially if you have heart disease. Recent heart or blood vessel problems. A newer form of the medicine that dissolves on the tongue might work faster than the pill that you swallow.Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in . 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 . $ One-time offer Get free savings Most popular Low price Walmart $ retail Save 99% $ One-time offer Get free savings Walgreens $1, retail Save 99%.