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 3 or 5 sildenafil pills at once to match the typical starting dose of 50 mg and 100 mg. Another option is the more expensive tadalafil 10 mg medicine, which is the usual starting dose for men. Also a tadalafil pill lasts in the body up to 36 hours and works just as effectively.
Sildenafil and tadalafil 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. Tadalafil rarely can also cause low back pain as a side effect.
The most important thing is to take the prescription as prescribed.
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.