Valif 20 Mg, a generic form of Vardenafil, belongs to a class of medications known as phosphodiesterase type 5 (PDE5) inhibitors. It works by enhancing blood flow to the penis, facilitating erections. Dosage typically ranges from 5-20 mg, with effects lasting up to 4-5 hours. Common side effects include headache, flushing, and nasal congestion.