This increase in blood flow results in a firmer, longer-lasting erection. There is a problem with information submitted for this request. However, others work on a cash-pay basis and don’t partner with insurance companies. The following information includes only the average doses of this medicine. Tadalafil is available as 2. Children—Use is not recommended.headache, severe and throbbing. hives or welts, itching, skin rash. inability to move the arms, legs, or facial muscles. inability to speak. joint or muscle pain. loss of heat from the body. numbness or tingling of the face, hands, or . Generic: Tadalafil. Form: oral tablet; Strengths: mg, 5 mg, 10 mg, and 20 mg; Brand: Cialis. Form: oral tablet; Strengths: mg, 5 mg, 10 mg, and 20 mg; Adult dosage (ages 18–64 years). Generic name: tadalafil [ ta-DAL-a-fil ] Brand names: Adcirca, Cialis Drug class: Impotence agents Medically reviewed by Sanjai Sinha, MD. Last updated on Uses Warnings Before taking Dosage Side effects Interactions FAQ What is Cialis?