They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Take all of the tablets for your daily dose at one time each day; do not divide the tablets to take as separate doses. Before taking tadalafil, tell your doctor and pharmacist if you are allergic to tadalafil, any other medications, or any of the ingredients in tadalafil tablets. Nitrates come as tablets, sublingual under the tongue tablets, sprays, patches, pastes, and ointments. Persons surnamed “Cialis” objected to Eli Lilly and Company’s so naming the drug, but the company has maintained that the drug’s trade name is unrelated to the surname. Symptoms may include sudden urges to urinate urgency , difficulty in starting urination hesitancy , a weak urine stream, and more frequent urination — especially at night.These prices can vary based on your state, subscription package discounts, and whether you have the prescription mailed to you or filled through a pharmacy. Generic Cialis (tadalafil) Roman. Tadalafil is in a class of medications called phosphodiesterase (PDE) inhibitors. It works to treat erectile dysfunction by increasing blood flow to the penis during sexual stimulation. This increased blood flow can cause an erection. Tadalafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow more easily. Tadalafil Prices, Coupons and Patient Assistance Programs. Tadalafil is a member of the agents for pulmonary hypertension drug class and is commonly used for Benign Prostatic Hyperplasia, Erectile Dysfunction, and Pulmonary Arterial Hypertension.. Brand names for tadalafil include Cialis. The cost for tadalafil oral tablet 5 mg is around $27 for a supply .