Tadalafil
Cialis (tadalafil) is a prescription medication primarily used to treat erectile dysfunction (ED) in men and symptoms of benign prostatic hyperplasia (BPH). It belongs to a class of drugs called phosphodiesterase 5 (PDE5) inhibitors, which work by increasing blood flow to the penis during sexual stimulation. Unlike some other ED medications, Cialis is known for its longer duration of action, lasting up to 36 hours per dose.
Cialis is a PDE5 inhibitor used to treat erectile dysfunction and BPH symptoms in men.
Key facts at a glance
- RxNorm
- 303263
- Generic
- Cialis
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Cialis is FDA-approved for treating erectile dysfunction (difficulty achieving or maintaining an erection) and signs/symptoms of benign prostatic hyperplasia (enlarged prostate). It is for use in adult men only.
Cialis inhibits the phosphodiesterase type 5 (PDE5) enzyme, which leads to relaxation of smooth muscle and increased blood flow in the corpus cavernosum of the penis. For BPH, it relaxes muscles in the prostate and bladder. Sexual stimulation is required for the medication to work for ED.
Cialis should not be taken with nitrates or certain blood pressure medications due to risk of severe hypotension. Common side effects include headache, indigestion, back pain, and muscle aches. Do not take more than once daily. Consult a healthcare provider before use, especially if you have heart conditions, low blood pressure, liver/kidney problems, or a history of stroke. Brand-name medication with generic tadalafil available.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed July 26, 2026. · Read our editorial policy