Some people buy tadalafil online without a prescription. Grapefruit may interact with tadalafil and lead to unwanted side effects. 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. Store at room temperature away from moisture and heat. Cialis is a brand-name prescription medication. Tadalafil was found to have similar benefits for lower urinary tract symptoms as the usually prescribed tamsulosin. Do not break or split a Cialis tablet.Here are answers to some frequently asked questions about drug cost and Cialis. What’s the cost per pill of Cialis 20 mg? How does this compare with the cost of other strengths ( mg, 5 mg, Cialis can cost around $ to $ per month out of pocket, depending on the dosage you need. The first generic version of Cialis was released in October , and other manufacturers have released generic versions since then. This has increased market competition, driving prices down. How we vet brands and products Cialis is a medication approved by the Food and Drug Administration (FDA) often used to treat erectile dysfunction (ED) and .