When oral medications might not be safe

Before taking any medication for erectile dysfunction, get your doctor's OK. Medications for erectile dysfunction might not work or might be dangerous if you:

• Take nitrate drugs — commonly prescribed for chest pain (angina) — such as nitroglycerin (Nitro-Dur, Nitrostat, others), isosorbide mononitrate (Monoket) and isosorbide dinitrate
• Have very low blood pressure (hypotension) or uncontrolled high blood pressure (hypertension)
• Have severe liver disease
• Have kidney disease that requires dialysis