I am 31 years old. i take coreg (carvedilol) 12.5mg twice a day. who is at most risk of developing erectile disfunction while taking coreg (carvedilol) 12.5mg 2 a day?

It's possible, but: Coreg (carvedilol) falls into the category of a newer type of beta blocker. This family of drug, particularly in young males may--but not risks, side effects, benefit must be weighed for each drug for each person. If the side effect occurs, don't stop the drug, but report it to your physician. I'm quite certain an alternate medication that won't cause ed can be found for your problem.