1. History of allergy to PI, CPC or CHX and its relevant excipients 2. All forms of thyroid disease or current radioactive iodine treatment 3. Lithium therapy 4. Known pregnancy 5. Renal failure

1. History of allergy to PI, CPC or CHX and its relevant excipients 2. All forms of thyroid disease or current radioactive iodine treatment 3. Lithium therapy 4. Known pregnancy 5. Renal failure