What side effects should I be worried about while taking cephalexin?

Side effects rare. Cephalexin is an antibiotic and typically has few side effects. If you are allergic, you may develop swelling, difficulty breathing or a rash. Otherwise, stomach upset is a rare side effect. Yeast infections are common after any antibiotic.
Cephalexin. Hi. I am not familiar with the main side effects of cephalexin, but I do believe there needs to be cautions in select cases.