Do not take this medicine with any of the following medications:

-cisapride
-cobicistat
-nitrates like amyl nitrite, isosorbide dinitrate, isosorbide mononitrate, nitroglycerin
-riociguat
-telaprevir

This medicine may also interact with the following medications:

-antiviral medicines for HIV or AIDS
-bosentan
-certain medicines for benign prostatic hyperplasia (BPH)
-certain medicines for blood pressure
-certain medicines for fungal infections like ketoconazole and itraconazole
-cimetidine
-erythromycin
-rifampin

They need to know if you have any of these conditions:

-anatomical deformation of the penis, Peyronie''s disease, or history of priapism (painful and prolonged erection)
-bleeding disorders
-eye disease, vision problems
-heart disease
-high or low blood pressure
-history of blood diseases, like sickle cell anemia or leukemia
-kidney disease
-liver disease
-pulmonary veno-occlusive disease (PVOD)
-stomach ulcer
-an unusual or allergic reaction to sildenafil, other medicines, foods, dyes, or preservatives
-pregnant or trying to get pregnant
-breast-feeding

Tell your doctor or healthcare professional if your symptoms do not start to get better or if they get worse.

Tell your doctor or health care professional right away if you have any change in your eyesight or hearing.

You may get dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Avoid alcoholic drinks; they can make you more dizzy.

Keep out of the reach of children.

After this medicine is mixed by your pharmacist, store it below 30 degrees C (86 degrees F) or in a refrigerator between 2 and 8 degrees C (36 and 46 degrees F). Do not freeze. Throw away any unused medicine after 60 days.