Take sildenafil exactly as prescribed by your doctor
Take it about 30 to 60 minutes before sexual activity
Do not take more than one dose in 24 hours
Swallow the tablet with water
You may take it with or without food
Avoid heavy or high-fat meals before taking it
Do not take sildenafil with nitrate medicines
Do not take sildenafil with riociguat
Avoid grapefruit and grapefruit juice
Avoid excessive alcohol
Do not use it if you do not have erectile dysfunction unless your doctor tells you to
Stop and seek medical help if you get chest pain, fainting, sudden vision loss, sudden hearing loss, or an erection lasting more than 4 hours
Tell your doctor about all medicines and health conditions before using it