Hello, I have an absess on my shoulder blade and after going to the doctor, he said it's not big enough to open and drain. He prescribed: 2x 500 mg of cephalixin - 3 times per day 2x 500 mg paracetamol - 3 times per day 1x 500 mg mefenamic acid - 3 times per day 1x 500 mg Flagyl - 2 times per day This is for 5 days. I started yesterday but feel my legs are very tired, after waking up. This morning my jaw was hurting when i eat as well. Are they serious side effects please? I am an expat