Tadalafil works on the PDE5 enzyme in the lungs to relax the blood vessels. Ask your pharmacist or doctor for a copy of the manufacturer’s information for the patient. What should I do if I forget a dose? Read more on male sexual health on the Sexual Health Australia site. If you take nitrates in any form, or are on treatment for pulmonary hypertension , you should not take tadalafil. Prolonged erections can be dangerous.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. There are many ways to save on Cialis, which is available as both a brand-name and generic medication. Save with GoodRx. GoodRx can help you save over 97% off the average retail price of the generic version. Generic Cialisat certain pharmacies is less than $13 with a free GoodRx discount. 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.