Viagra, which is made of sildenafil, is used to treat impotence by making more blood flow to the penis. Most of the time, you shouldn't take Viagra more than once a day without first talking to a doctor. Most people are told to take the drug 30 minutes to an hour before getting sexual, and the effects can last up to 4 hours. Side effects and problems are more likely to happen if you take Viagra too often or in higher doses than your doctor tells you to. Headaches, redness, dizziness, and stomachaches are all common side effects of Viagra. In worse cases, it can cause an erection that lasts too long (priapism), which needs medical help right away.
Also, taking Viagra more than once a day may make it more likely that it will mix badly with other medicines or health problems. It is very important to do what your doctor tells you and only take the amount that they recommend. It's important to talk to a doctor or nurse if you have questions about your medicine or how much to take. They can give you personalized advice based on your health history and current drugs.
