Generic sildenafil 20 mg is generally safe, but should never be used as a recreational drug. It’s a prescription medicine. Our doctors prescribe it to treat a medical condition. Depending on your medical history and what our doctor recommends, you should take 1, 3 or 5 pills at once.
Sildenafil can cause serious side effects. These include but are not limited to an erection lasting more than four hours, sudden loss of vision in one or both eyes, and sudden decrease or loss of hearing. The more pills you take at a time or the higher the dose, the more likely you are to experience side effects.
If you have low blood pressure, heart disease, take medicines for heart disease or for high blood pressure, you'll be at greater risk of serious side effects such as severe dizziness, fainting, heart attack, and stroke.
If we give you a prescription for sildenafil, read our detailed Treatment Plan before you take the medicine. It contains important information. Also, read the package insert that comes with the medicine for a full list of side effects and warnings.