Do not take a double dose or more than one dose per day to make up for a missed one. Refills: See if you can set up automatic refills or order as needed. It may be taken with or without food. Contact your medical provider if you experience any side effects during treatment. If approved, the provider will issue a prescription. What is Cialis? Understanding Erectile Dysfunction and Its Treatment Cialis, scientifically known as Tadalafil, is a prescription medication primarily used to treat erectile dysfunction ED in men.Side Effects. Headache, stomach upset, back pain, muscle pain, stuffy nose, flushing, or dizziness may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. To. 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, . Exclusive Offers · How It Works · Get More Info4/5 ( reviews)Types: Tadalafil · Sildenafil · Finasteride.