Forzest 20 mg is a phosphodiesterase type 5 (PDE5) inhibitor, a class of drugs commonly used to treat ED. It works by enhancing the effects of nitric oxide, a chemical naturally produced in the body that relaxes muscles in the penis, allowing for increased blood flow and thus facilitating erections. Forzest 20 mg is typically taken orally as needed, approximately 30 minutes before sexual activity, and its effects can last for up to 36 hours, making it a popular choice among men seeking spontaneity in their sexual encounters.