Patients receiving Carbimazole (Neomerdin) should be under close surveillance and should immediately seek medical help if any evidence of illness particularly mouth ulcers, sore throat, fever, bruising and malaise occurs. Full blood count should be performed. Treatment with Carbimazole (Neomerdin) should be discontinued if there is any evidence of neutropenia or liver damage. Excessive dose of anti-thyroid drugs may cause hypothyroidism and goiter.