What are the types of Viagra?

Viagra is a common name for PDE5 inhibitors, also known as phosphodiesterase inhibitors. Currently, there are mainly three types on the market: sildenafil, vardenafil, and tadalafil.

The product name of sildenafil is Viagra, which is produced in China and is called Jinge. It is the earliest drug used in clinical practice. It is orally administered 50mg for 30-60 minutes before sexual intercourse, with a maximum dose not exceeding 100mg. It is susceptible to the influence of alcohol and greasy foods, and has a relatively short duration of action.