Common use

Cialis is used to treat erectile dysfunction (impotence) and symptoms of benign prostatic hypertrophy (enlarged prostate). Cialis relaxes muscles of the blood vessels and increases blood flow to particular areas of the body.

Dosage and direction

Cialis is usually taken only once per day. Do not take this medicine in larger or smaller amounts or for longer than recommended. Cialis can be taken with or without food. Do not break or split a tablet. Swallow it whole.
For erectile dysfunction, take Cialis just before sexual activity but not more than once per day.

Precautions

To make sure this Cialis is safe for you, tell your doctor if you have ever had: heart disease or heart rhythm problems; a heart attack or stroke; angina (chest pain), high or low blood pressure; pulmonary hypertension (unless you are taking tadalafil for this); a condition called pulmonary veno-occlusive disease (narrowing of the veins that carry blood from the lungs to the heart); liver or kidney disease (or if you are on dialysis); vision loss, or retinitis pigmentosa (an inherited condition of the eye); a bleeding disorder; a blood cell disorder such as sickle cell anemia, multiple myeloma, or leukemia; a physical deformity of the penis (such as Peyronie's disease), or an erection lasting longer than 4 hours; a stomach ulcer; or health problems that make sexual activity unsafe.
Drinking alcohol with this medicine can cause side effects.
Grapefruit and grapefruit juice may interact with tadalafil and lead to unwanted side effects. Avoid the use of grapefruit products while taking this medicine.

Contraindications

You should not take Cialis if you are allergic to tadalafil.
Taking Cialis with certain other medicines can cause a sudden and serious decrease in blood pressure. Do not take this medicine if you also use: riociguat (to treat pulmonary arterial hypertension); or a nitrate drug (for chest pain or heart problems) such as nitroglycerin, isosorbide dinitrate, isosorbide mononitrate, or recreational drugs such as amyl nitrate or nitrite "poppers".

Possible side effect

Stop and get medical help at once if you have nausea, chest pain, or dizziness during sex. You could be having a life-threatening side effect.
Stop using this medicine and call your doctor at once if you have: a light-headed feeling, like you might pass out; an erection is painful or lasts longer than 4 hours (prolonged erection can damage the penis); vision changes or sudden vision loss; ringing in your ears or sudden hearing loss; or heart attack symptoms - chest pain or pressure, pain spreading to your jaw or shoulder, nausea, sweating.
Common Cialis side effects may include: headache; flushing (warmth, redness, or tingly feeling); nausea, upset stomach; stuffy nose; or muscle pain, back pain, pain in your arms, legs, or back.

Drug interaction

Tell your doctor about all your current medicines and any you start or stop using, especially: medicines to treat erectile dysfunction or pulmonary arterial hypertension; an antibiotic or antifungal medicine; antiviral medicine to treat hepatitis C or HIV/AIDS; drugs to treat high blood pressure or a prostate disorder; or seizure medicine.

Missed dose

As Cialis is used as needed, you are not likely to be on a dosing schedule.

Overdose

Seek emergency medical attention.

Storage

Store at room temperature away from moisture and heat. Keep away from children.