These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. Tadalafil comes as a tablet to take by mouth. Sexual activity may be a strain on your heart, especially if you have heart disease. Your doctor may need to change the doses of your medications or monitor you carefully for side effects. Is 20mg of Cialis better than mg of Viagra? Do not take a double dose or more than one dose per day to make up for a missed one. Because they are the same class of medications, they have similar side effects and effectiveness.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. [4] [5] [7] It is taken by mouth. [7] Onset is typically within half an hour and the duration is up to 36 hours. Tadalafil (Cialis) is used to treat erectile dysfunction (ED, impotence; inability to get or keep an erection), and the symptoms of benign prostatic hyperplasia (BPH; an enlarged prostate) which include difficulty urinating (hesitation, dribbling, weak stream, and incomplete bladder emptying), painful urination, and urinary frequency and urgency in adult men. Best prices for generic cialis on the Internet! The safest way is to ask your physician to try an alternate prescription. Detailed dosage guidelines and administration information for Cialis (tadalafil). Includes dose adjustments, warnings and .