You should only be treated with one of these products at a time. What should I do if I forget a dose? Tadalafil is available on prescription only. Brand names Why is this medication prescribed? You can buy it from a store-based pharmacy or reputable online pharmacy with a prescription. Therefore the use of such treatments in combination with Cialis is not recommended. If you become pregnant while taking tadalafil, call your doctor.Find Your Local Rite Aid Pharmacy. Use the map below to locate Rite Aid Pharmacy locations near you. You’ll find prices, discount coupons, business hours, phone & fax numbers and more. California.  · Cialis is a prescription drug used to treat erectile dysfunction and benign prostatic hyperplasia. Learn about its dosages, form, strengths, and more. Tadalafil (Cialis) is used to treat erectile dysfunction (ED, impotence; inability to get or keep an erection), and the symptoms of benign prostatic hyperplasia (BPH; an enlarged prostate) which include difficulty urinating (hesitation, dribbling, weak stream, and incomplete bladder emptying), painful urination, and urinary frequency and urgency in adult men.