The decision of availability is completely up to the company marketing the product. The active ingredient can remain longer if you have problems with your kidneys or liver, or you are taking certain other medications. The penis is one of the areas where this enzyme works. Cialis will be available as oral tablets in 5mg, 10mg and 20mg strengths. From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health.Published on October 18, warning This article is no longer being updated and some information may not be current. Visit the GoodRx Healthhomepage for our latest articles. . tell your doctor and pharmacist if you are allergic to tadalafil, any other medications, or any of the ingredients in tadalafil tablets. Ask your pharmacist for a list of the ingredients.  · Description and Brand Names Drug information provided by: Merative, Micromedex ® US Brand Name Adcirca Cialis Descriptions Tadalafil is used to treat .