Hives are not listed as a side effect of clopidogrel/Plavix. Nonetheless, your dad should contact his physician to report the hives, which are often the result of an allergic reaction.
Hives, rashes, itching, trouble breathing and swelling are side effects that indicate allergic reaction. Looks like your dad is having an allergic reation
Common side effects include easy bruising and minor bleeding but hives are a severe side effect signaling a possible allergic reaction. Your father should go to the ER or the doctor's office immediately to evaluate a possibly fatal allergic reaction.
