This means you’ll need to pay the full cost of the medicine. Both Cialis and Viagra are effective at these doses. If you become pregnant while taking tadalafil, call your doctor. If you are taking tadalafil to treat PAH or BPH, follow your doctor’s directions and the guidelines in this paragraph. These include a heart attack, stroke or a serious heart rhythm disorder in the past six months. Medicines that you take by mouth are called oral medicines.Published on October 18, warning This article is no longer being updated and some information may not be current. Visit the GoodRx Healthhomepage for our latest articles. We have good news for you: generic Cialis, used to treat erectile dysfunction (ED)and enlarged prostates, just hit pharmacies. tadalafil Used for Benign Prostatic Hyperplasia, Erectile Dysfunction erectile dysfunction (ED) benign prostatic hyperplasia, or BPH). Tadalafil (Cialis) is available both as brand-name and generic tablets. Common side effects of this medication include headache and indigestion. Tadalafil (Cialis) does interact with some medications Reviewed by. The recommended starting dose for Cialis intended for once daily use is mg, take at the same time each day, without regard to timing of sexual activity. This may be increased to 5mg/day based on need and tolerability. May be taken with or without food. Cialis is available as a generic, under the name tadalafil. 3.