I am suffering from Polymyositis, since one year. My CPK was 2379 before 8 months, Then decreased to 221 last in Aug-17 after IVIG infusion. Now I am on 20 mg. Omnacortil once a day, Tappered from 60 mg. In Oct-17, my CPK found 322. I have taken @ 20 nos. Ampoxilin tab for Coughing / throat infection before test. No chest pain , No arm / shoulder / back pain / No breathing problem. What will be the reason for elevating CPK ? Pl. guide. Thanks... Harsha - F/ 55 yrs.