Your doctor will discuss the best treatment plan for you. Patients who have a condition called “left ventricular outlet obstruction” from valvular problems or heart muscle enlargement may get side effects such as fainting or light-headedness. What should I do if I forget a dose? BPH occurs when the prostate and the surrounding tissues become enlarged. For further information contact your pharmacist or Eli Lilly and Company directly. · Cialis (tadalafil) is a prescription tablet used for erectile dysfunction and benign prostatic hyperplasia. Tell them about all prescription, over-the-counter, and other drugs you take. Also. Tadalafil is also sometimes taken once a day every day without regard to timing of sexual activity. You may attempt sexual activity at any time between doses. If you are taking tadalafil on a regular schedule, take it at around the same time every day. (over-the-counter) medicines you are taking, as well as any products such as vitamins. 5. Penile implant. A penile implant involves a to minute surgical procedure that places a water-based device into the erection chambers of the penis, which enables you to reliably control exactly when and how long an erection lasts. Dr. Starke says this is the closest option to a cure that exists for ED.