Storage Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. You should take tadalafil one time a day. Prolonged erections can be dangerous. It works to treat erectile dysfunction by increasing blood flow to the penis during sexual stimulation. The medication should be taken once daily at about the same time every day to maintain a consistent level of medicine in the body. If you forget to take it If you have: benign prostate enlargement — take it as soon as you remember and then continue as usual pulmonary hypertension — take it within 8 hours if you can.However, Cialis lasts much longer and is noteworthy for the amount of time it remains in your body. You may feel the effects of the drug up to 36 hours after you take it. mg, 5 mg, 10 mg.  · But on average, its effects start to lessen 2 to 3 hours after you take a dose. The typical dose for once-daily Cialis for ED is milligrams (mg) to 5 mg. When used as needed for ED, the usual. 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.