For further information contact your pharmacist or Eli Lilly and Company directly. For treatment of erectile dysfunction as needed : Adults—10 milligrams mg as a single dose, no more than once a day, taken 30 minutes before you think sexual activity may occur. Stop using tadalafil and call your doctor at once if you have: heart attack symptoms–chest pain or pressure, pain spreading to your jaw or shoulder, nausea, sweating; vision changes or sudden vision loss; ringing in your ears or sudden hearing loss; or an erection is painful or lasts longer than 4 hours prolonged erection can damage the penis. Ask your healthcare professional how you should dispose of any medicine you do not use. It is not possible to determine whether these events are related directly to the use of PDE5 inhibitors or to other factors [see Adverse Reactions 6.We have good news for you: generic Cialis, used to treat erectile dysfunction (ED)and enlarged prostates, just hit pharmacies. Prices for the generic, known as tadalafil, are more than 50% less than those of brand-name Cialis. As more men are able to afford tadalafil and treat their ED, it’s likely that many will have questions. Introduction If you’re looking at treatment options for erectile dysfunction (ED), you may want to learn more about Cialis and its cost. It’s a prescription drug used to treat symptoms of ED and. Tadalafil is in a class of drugs called phosphodiesterase-5 (PDE5) inhibitors and is available in a generic form often called generic Cialis. Tadalafil has been on the market since and.