This medicine works best when you take it on an empty stomach an hour before sex. When oral medications might not be safe Check with your health care team before you take any medicine for erectile dysfunction. Cialis Daily tadalafil : This low-dose Cialis works by increasing blood flow to the penis over time, making it easier to have an erection when aroused. Read our editorial process. Such patients must not apply any out-of-pocket expenses incurred using this Savings Offer toward any government insurance benefit out-of-pocket spending calculations, such as Medicare Part D true out-of-pocket TrOOP costs You are responsible for reporting use of this Savings Offer to any private insurer, health plan, or other third party who pays for or reimburses any part of the prescription filled using this Savings Offer, as may be required. Rarely reported side effects include: an erection that will not go away priapism. Are there any restrictions that I need to follow?SAVINGS Terms and conditions apply. take any medicines called nitrates, often prescribed for chest pain, or guanylate cyclase stimulators like Adempas (riociguat) for pulmonary . Urologist Tobias Kohler, M.D., answers the most frequently asked questions about erectile dysfunction. Ask Mayo Clinic: Erectile Dysfunction From an accredited US . Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes .