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If you have side effects with the 10-mg dose, your doctor may prescribe a 5-mg dose. If the 10-mg dose doesn’t work for you, they may increase your treatment to the maximum dosage of 20 mg once per day. Cialis (tadalafil) is a brand-name drug that’s prescribed for erectile dysfunction (ED) and benign prostatic hyperplasia (BPH). Cialis comes as an oral tablet that’s typically taken once per day or on occasion as needed.

10 mg every 12 hours