Viagra active ingredient

The active ingredient in Viagra is sildenafil, which is a type of phosphodiesterase (PDE5) inhibitor. Sildenafil works by inhibiting the PDE5 enzyme, which is responsible for the breakdown of cyclic guanosine monophosphate (cGMP). cGMP is a key player in the erectile process, as it relaxes smooth muscle cells and allows blood to flow into the penis. When PDE5 is inhibited, cGMP levels remain high, allowing for an erection to occur.

Viagra was originally developed as a treatment for angina pectoris (a heart condition), and it was found to be effective in improving erections when used for this purpose. However, it wasn’t until several years later that the drug’s true potential was realized. In 1998, Viagra became the first oral treatment approved by the FDA for erectile dysfunction.

Today, Viagra remains one of the most popular treatments for ED, and has helped millions of men around the world achieve and maintain an erection. While there are other PDE5 inhibitors available on the market today (such as Cialis and Levitra), Viagra remains one of the most effective options.

Sildenafil, also known as Viagra, is a popular treatment for erectile dysfunction. It works by relaxing the blood vessels in the penis, allowing more blood to enter and causing an erection.

Sildenafil is available in tablets of 25mg, 50mg and 100mg. The usual starting dose is 50mg, but some men may need a lower or higher dose depending on their medical history and other medications they are taking.

Sildenafil should be taken about 30-60 minutes before sex. It can be taken with or without food but it is best to take it on an empty stomach so that it works more quickly. You should not take more than one tablet in 24 hours and if you have certain medical conditions your doctor may advise you to take a lower dose or take it less often.

Side effects of sildenafil include headaches, flushing, indigestion and dizziness. These are usually mild and temporary side effects but if they persist or are bothersome you should speak to your doctor. More serious side effects include changes in vision (such as blue tinge to vision), sudden decrease or loss of hearing and priapism (a painful erection lasting for more than four hours). If you experience any of these side effects you should seek immediate medical attention as they could be a sign of something more serious such as a heart attack or stroke.