Indication: What Neo-Mercazole is used for This medicine is used to treat hyperthyroidism or overactive thyroid gland (a condition where the thyroid gland produces too much thyroid hormone). Ask your doctor if you have any questions about why this medicine has been prescribed for you. Your doctor may have prescribed it for another reason. This medicine is not addictive. This medicine is available only with a doctor’s prescription. Action: How Neo-Mercazole works Neo-Mercazole contains the active ingredient carbimazole. This medicine belongs to a group of medicines called antihyperthyroidism agents. These medicines work by reducing the production of thyroid hormones. It is believed to exert its antithyroid effect by ‘blocking’ the organic binding of iodine through inhibition of the iodination of tyrosine. It is also thought to have some action on peroxidase which is required as a catalyst in the synthesis of thyroxine by the thyroid gland. It does not affect the uptake of iodine by the thyroid gland and this is of vital importance in the treatment of thyrotoxicosis with radioactive iodine or with a combination of radioiodine and Neo-Mercazole, and also in preparation of patients for operation. Neo-Mercazole contains 5 mg of carbimazole as the active ingredient. It also contains lactose monohydrate, maize starch, sucrose, magnesium stearate, purified talc, acacia, iron oxide red, gelatin. This medicine does not contain gluten. Dose advice: How to use Neo-Mercazole Before you take NeoMercazole When you must not take it Do not take Neo-Mercazole if you have an allergy to: Any medicine containing carbimazole; Any of the ingredients listed here. Some of the symptoms of an allergic reaction may include: Shortness of breath; Wheezing or difficulty breathing; Swelling of the face, lips, tongue or other parts of the body; Rash, itching or hives on the skin. Do not take Neo-Mercazole if you have had any of the following medical conditions: Growth of the thyroid gland downwards from the neck into the chest (retrosternal goitre); Serious blood disorder; Severe liver disorder; Airway obstruction. Do not take this medicine after the expiry date printed on the pack or if the packaging is torn or shows signs of tampering. If it has expired or is damaged, return it to your pharmacist for disposal. A valid prescription should be available upon delivery