Viagra, also known by its generic name sildenafil, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. It was originally developed by pharmaceutical company Pfizer in the late 1980s and was approved for use by the FDA in 1998. Since then, it has become one of the most well-known and widely used drugs in the world.

Erectile dysfunction (ED), or the inability to achieve or maintain an erection, is a common condition that affects millions of men worldwide. It can have various causes, including age, stress, certain medical conditions, and psychological factors. Viagra works by increasing blood flow to the penis, which helps men with ED achieve and maintain an erection.

So this is a guidebook on things you should know before using viagra for sex