Likewise, if you experience side effects, we may recommend that you try a lower dose of Tadalafil. Understanding Erectile Dysfunction and Its Treatment Cialis, scientifically known as Tadalafil, is a prescription medication primarily used to treat erectile dysfunction ED in men. What if I am taking other drugs? Who should not take Cialis? The active ingredient can remain longer if you have problems with your kidneys or liver, or you are taking certain other medications.This is a generic drug. The average cost for 30 Tablet(s), 5mg each of the generic (tadalafil) is $ You can buy tadalafil at the discounted price of $ by using the MDRx coupon, a savings of 93%. Even if this drug is covered by Medicare or your insurance, we recommend you compare prices. Published on October 18, warning This article is no longer being updated and some information may not be current.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. The drug comes in low-dose versions that can be taken daily. This means you can have sex at any time, rather than needing to take a pill from time to time as needed like other ED brands. The starting dose for daily-use Cialis is milligrams (mg). If that doesn’t work, you can increase your daily dose up to 5 mg.