If you become pregnant while taking tadalafil, call your doctor. Reading is good for you Hearing problems: Rarely, people taking Cialis Tadalafil have experienced a sudden decrease or loss of hearing. Ask your healthcare professional how you should dispose of any medicine you do not use. Read the privacy policy to understand how your data will be used.If you’re taking Cialis mg daily for ED versus 20 mg as needed before sexual activity, your cost may be different depending on how often you take the drug. Tadalafil (generic Cialis) may.  · Cialis; Descriptions. Tadalafil is used to treat men who have erectile dysfunction (also called sexual impotence). Tadalafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where . Get the facts on cost and Cialis, how the generic compares with the brand-name version, what financial assistance may be available, and more. milligrams (mg), 5mg, 10 mg, and 20 mg. The.