Cialis can be taken daily, providing constant treatment for ED for people who have sex frequently. This leads to shortness of breath when exercising or completing regular daily activities. By controlling the enzyme, tadalafil helps to maintain an erection after the penis is stroked by increasing blood flow to the penis. ED occurs more frequently in older men. They are PDE5 inhibitors that allow for increased blood flow to the penis, leading to more frequent and harder erections. Emling S. This leads to more blood flow to the penis, leading to stronger erections. · 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 . The formulas of the main anabolics are very similar in structure to natural steroid hormones, and, accordingly, they are recognized by the pituitary and hypothalamus. And since the regulator believes that there is an overabundance of them in the body, it gives the command to turn off the production of its own hormones. Related: U.S. Drug Shortages: Root Causes and Recent Statistics. Current | Resolved | Discontinued. Generic Name. Revision Date. % Sodium Chloride 10 mL, 20 mL, and 50 mL Preservative Free Vials and Syringes. September 8, % Sodium Chloride Flush Syringes. August 23, % Sodium Chloride Irrigation.