These medicines are called PDE5 inhibitors. Most online pharmacies do not prescribe or refill controlled substances, like Adderall, Xanax, or oxycodone. These medicines all work well for ED. It’s available in 10 mg and 20 mg tablets. These are commonly prescribed for an enlarged prostate or male pattern baldness. As with sildenafil, a high-fat meal or alcohol keep the body from absorbing it as quickly.Depending on your symptoms and needs, you may be prescribed Viagra, sildenafil, Cialis, tadalafil, Stendra, paroxetine, or a combination of tadalafil and sildenafil, available as . According to price-comparison site , generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s compared with . Viagra. Compare prices and print coupons for Sildenafil (Generic Revatio and Viagra) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $