Tadalafil 20 mg is the maximum as-needed dose for ED. Learn about its uses, how long it lasts, side effects, and how to save on your prescription. Key Takeaways Cialis (tadalafil) is used primarily to treat erectile dysfunction and symptoms of benign prostatic hyperplasia. Dosage varies based on treatment goals, ranging from daily low-dose to higher doses taken as needed. Typical adult doses range from 2.5 mg to 20 mg, with adjustments made for individual health. Cialis (tadalafil) increase increases blood flow to a certain area of the body and is used to treat erectile dysfunction (impotence). Includes Cialis side effects, interactions and indications. Cialis (tadalafil) is a prescription tablet used for erectile dysfunction and benign prostatic hyperplasia. Learn about dosage, side effects, and more. Find drug information for Tadalafil on CVS.com, including related drug classes, side effects, dosage, and answers to frequently asked questions. Detailed dosage guidelines and administration information for Cialis (tadalafil). Includes dose adjustments, warnings and precautions. Cialis 20 mg is available only with your doctor's prescription. Cialis 20 mg indications Erectile Dysfunction Cialis 20 mg tablets are indicated for the treatment of erectile dysfunction (ED). Benign Prostatic Hyperplasia Cialis 20 mg tablets are indicated for the treatment of the signs and symptoms of benign prostatic hyperplasia (BPH). Cialis is a phosphodiesterase 5 (PDE5) inhibitor for the treatment of erectile dysfunction and benign prostatic hyperplasia. Tadalafil is a generic drug prescribed for erectile dysfunction and other conditions. Learn about the drug’s dosages, form, strengths, and more. Cialis is an ED medication you can take once daily or as needed before sexual activity. Learn how to take Cialis and avoid side effects.