This product is available in the following dosage forms: Suspension Tablet There is a problem with information submitted for this request. What Is Cialis? The body takes longer to absorb it after a high-fat meal or alcohol. Most erectile dysfunction medications belong to the drug class known as PDE5 inhibitors , which help relax the muscles and increase blood flow to allow for a full erection. They include dutasteride Avodart, Jalyn and finasteride Propecia, Proscar. Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax.Tadalafil – STADA T20 – 20 Milligramm. Tadalafil, sold under the brand name Cialis among others, is a medication used to treat erectile dysfunction, benign prostatic hyperplasia, and pulmonary arterial hypertension. It is taken by mouth. Onset is typically within half an hour and the duration is up to 36 hours. Common side effects include headache, muscle pain, . The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. What Is Cialis? Cialis is a brand-name prescription medication. It belongs to the drug class known as PDE5 inhibitors. Tadalafil is its active ingredient and is available as a generic drug. The FDA has approved Cialis to treat ED, symptoms of BPH, or combined ED and BPH in males with both conditions. The drug is approved for use in adults.