I recently had breast reconstructive surgery, also have bone cancer, surgeon told me to take clindamycin if having even my teeth cleaned, recently my teeth are cracking and breaking, I have a dental apt. Tomorrow, but I had an awful reaction to the RX, am allergic to penicillin. Is there another Rx I can take which will not make me so sick? 52-year-old, female, 5ft4in 109lbs.