Sildenafil, the active component in Viagra, is a medication designed for on-demand use. This phosphodiesterase type 5 inhibitor has received approval from the Food and Drug Administration (FDA) for treating erectile dysfunction (ED). Its mechanism of action involves increasing blood flow to the penis, facilitating the attainment and maintenance of an erection. Sildenafil is an excellent choice for those seeking rapid results, as it typically takes effect within 30 minutes to 1 hour before engaging in sexual activity, with effects lasting for 3-5 hours. The appropriate dosage varies depending on the severity of the condition, ranging from 30-100mg, with 50mg being the most common (providing 12 doses in our 6-pill prescription).