I am a week past finishing my 12 days course of penicillin and I have major symptoms of pseudomembranous colitis. I read that penicillin can induce this during and after therapy. I'm wondering if it will subside my itself or if I need to do anything. I dont really want to go back to my GP and she is a dunderhead and only gave me penicillin because she didnt know what else to give.