If you are taking tadalafil for erectile dysfunction, your doctor will probably start you on an average dose of tadalafil and increase or decrease your dose depending on your response to the medication. Cialis is a brand-name prescription medication. ED occurs more frequently in older men. Ask your pharmacist for a list of the ingredients. Talk to your doctor about which dosing schedule is right for you. Take tadalafil exactly as directed. Other uses for this medicine This medication may be prescribed for other uses; ask your doctor or pharmacist for more information.Learn more about Cialis oral. 1. This is a generic drug. The average cost for 30 Tablet(s), 5mg each of the generic (tadalafil) is $ You can buy tadalafil at the discounted price of $ by using the MDRx coupon, a savings of 93%. Even if this drug is covered by Medicare or your insurance, we recommend you compare prices. The usual starting dose for once-daily Cialis is mg. Your doctor might increase the dose to 5 mg based on how you react to the medication. Take one tablet as prescribed at the same time each day. Cialis (tadalafil) is an orally administered prescription medication used for erectile dysfunction (ED) and pulmonary arterial hypertension (PAH) to reduce the symptoms of an enlarged prostate. mg, 5 mg, 10 mg, or 20 mg • Oral tablet: mg, 5 mg, 10 mg, or 20mg • Oral tablet: 20 mg, 40 mg • Oral suspension: 20 mg per 5 mL.