Sildenafil Viagra. Often, these are prescribed for chest pain called angina. Oral medicine for ED also might not be safe or work well if you have: Very low blood pressure, called hypotension, or uncontrolled high blood pressure, called hypertension. This boosts blood flow and helps you get an erection from sexual activity. 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. The four main medicines taken by mouth for erectile dysfunction are: Avanafil Stendra.Extra 15% off $30 sitewide with code SAVE15; Clip your mystery deal! BOGO 50% off select Walgreens health & wellness. AdRead Customer Reviews & Find Best Sellers. Free, Easy Returns On Millions Of Items. Get Deals and Low Prices On pill for ed On AmazonTypes: Accessibility · Pet Supplies · Pharmacy. The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 .