My daughter takes 500 mg ampicillin daily for acne.The laser hair removal spa where she has an appointment said that she had to stop the ampicillin for one month before the procedure. If stopped for a week, the acne begins to come back. Both my pharmacist and the nurse at the dermatologist's office said no need to discontinue ampicillin before the procedure because it does not cause photosensitivity. The spa aesthetician won't return my call to answer my question about the need to discontinue.