<—-is a dentist. All sounds normal for these meds however, IF you start to experience: Shortness of breath, HIVES, purple lesions, stop meds immediately and go to the nearest casualty department. When you have infections such as this, the lymph nodes are involved and you will notice swelling as the lymph nodes dispose and filter out diseased tissue and fluids, which is what is supposed to happen with antibiotics. Percocet is a pretty strong opiate. Could be why you feel a racing heart beat. Call the nurse before going back to casualty UNLESS have symptoms of allergy, described.