What is the Difference Between Sildenafil and Tadalafil?

Sildenafil and tadalafil are both PDE5 inhibitors that treat erectile dysfunction, but they differ significantly in duration and timing. Sildenafil is usually taken about 30-60 minutes before sexual activity and may help for several hours. Tadalafil can provide a longer opportunity for sexual activity—up to 36 hours after a dose. Neither medication causes a continuous erection, and sexual stimulation is still needed. Both medications are effective for many people, but results vary with the dose, the cause of erectile dysfunction, other health conditions, and how effectiveness is measured. Tadalafil also comes in a daily low-dose option (2.5-5mg) for continuous treatment, while sildenafil is primarily taken as needed. Side effects are comparable, though tadalafil may cause fewer visual disturbances. The choice depends on timing preferences, individual response, side effects, other health conditions, and possible drug interactions. Neither medicine should be used with nitrate medicines, and patients should review their medications with a clinician. Seek urgent care for an erection lasting more than four hours or sudden vision or hearing loss.