Product image of Neo-Mercazole (Carbimazole) supplied by GNH India

Neo-Mercazole

Active Ingredient:
Carbimazole
Origin:
EU

Neo-Mercazole (Carbimazole)

Carbimazole, the active ingredient in Neo-Mercazole, is a thionamide presented as an oral tablet for oral use. It is used to treat hyperthyroidism, including Graves' disease, by reducing excess thyroid hormone production in adults and children. The medication works by inhibiting thyroid peroxidase, thereby decreasing the synthesis of thyroxine (T4) and triiodothyronine (T3).

GNH India supplies Neo-Mercazole as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide. Our distribution network ensures consistent quality and regulatory compliance across EU and global markets.

Manufacturer / TM Owner

Amdipharm Limited

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Indications & Clinical Uses

Carbimazole is an antithyroid agent indicated for conditions characterized by excess thyroid hormone production, helping to restore normal metabolic balance.

  • Graves' disease: reduces thyroid hormone levels to achieve euthyroidism.
  • Toxic multinodular goiter: controls hormone overproduction from multiple nodules.
  • Toxic adenoma: suppresses hormone output from a solitary hyperfunctioning nodule.
  • Thyroid storm: provides rapid control of severe, acute hyperthyroidism.
  • Pre‑operative preparation for thyroidectomy: lowers hormone levels before surgery.

How It Works

  • Carbimazole is converted in vivo to its active metabolite, methimazole, which selectively inhibits thyroid peroxidase. This enzyme catalyzes iodination of tyrosine residues in thyroglobulin and the coupling of iodotyrosines, essential steps in the synthesis of thyroxine (T4) and triiodothyronine (T3). By blocking these reactions, carbimazole reduces the production and release of thyroid hormones, leading to decreased circulating hormone concentrations.

Side Effects

Adverse reactions may occur with carbimazole therapy and should be monitored.

Common Side Effects

  • Nausea or upset stomach.
  • Skin rash or pruritus.
  • Taste disturbance or loss of taste.
  • Arthralgia or muscle aches.
  • Mild headache.

Serious or Rare Side Effects

  • Agranulocytosis: severe drop in white blood cells, increasing infection risk.
  • Hepatotoxicity: liver enzyme elevations or hepatitis.
  • Vasculitis: inflammation of blood vessels, presenting with skin lesions or systemic symptoms.

Precautions & Warnings

Carbimazole requires careful monitoring and specific safety measures.

  • Thyroid function monitoring: check TSH and free hormone levels regularly to adjust dose.
  • White blood cell count: perform baseline and periodic CBC to detect agranulocytosis early.
  • Liver function: assess hepatic enzymes before initiating therapy and during treatment.
  • Pregnancy considerations: use only if benefit outweighs risk; discuss with a specialist.
  • Elderly dosing: start with lower dose and titrate cautiously due to altered metabolism.
  • Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Avoid Interactions

Carbimazole can interact with several medicines, affecting efficacy or safety.

Major Interactions (Avoid)

  • Warfarin: carbimazole may potentiate anticoagulant effect, increasing INR.
  • Amiodarone: combined use can exacerbate thyroid dysfunction.
  • Lithium: may enhance hypothyroid effect, requiring closer monitoring.

Moderate Interactions (Monitor Closely)

  • Beta‑blockers: may mask symptoms of thyrotoxicosis, complicating assessment.
  • Antacids (aluminum or magnesium): can reduce carbimazole absorption; separate dosing by at least 2 hours.
  • Rifampicin: may increase hepatic metabolism of carbimazole, reducing its effectiveness.

Frequently Asked Questions

Neo-Mercazole contains carbimazole, an antithyroid medication used to treat hyperthyroidism, including Graves' disease, toxic multinodular goiter, toxic adenoma, and to prepare patients for thyroid surgery by lowering excess thyroid hormone levels.

Carbimazole is converted to methimazole, which inhibits thyroid peroxidase, an enzyme essential for iodination and coupling of tyrosine residues in thyroglobulin. This blockade reduces the synthesis of the thyroid hormones T4 and T3, thereby decreasing circulating hormone concentrations.

The appropriate dose of Neo-Mercazole is determined by the prescribing clinician based on the severity of hyperthyroidism, patient age, weight, and laboratory results. Dosage may be adjusted over time to maintain target thyroid hormone levels.

Carbimazole can cross the placenta and is excreted in breast milk. It should be used in pregnancy or while breastfeeding only if the potential benefit justifies the potential risk to the fetus or infant, and under close medical supervision.

To order Neo-Mercazole, submit an enquiry on the product page at gnhindia.com specifying the required quantity. GNH India works with hospitals, pharmacies and procurement teams worldwide, verifies trade or institutional credentials, and then provides pricing, availability, shipping details and any necessary import documentation.

Neo-Mercazole (carbimazole) belongs to the thionamide class, similar to methimazole and propylthiouracil. Compared with propylthiouracil, carbimazole generally has a more favorable side‑effect profile and a longer half‑life, allowing once‑daily dosing, while methimazole is essentially the same active metabolite.

Neo-Mercazole tablets should be stored at room temperature, below 25 °C, in the original packaging to protect them from moisture and light. Keep the container tightly closed and out of reach of children.

Neo-Mercazole is taken orally, usually as a whole tablet with a glass of water. It may be taken with or without food, but consistency with meals helps maintain stable absorption. Follow the prescribing clinician’s instructions regarding timing and any dose adjustments.

The most serious adverse events include agranulocytosis, a potentially life‑threatening drop in white blood cells, and severe liver injury. Patients should report symptoms such as fever, sore throat, jaundice, or unusual fatigue promptly to their healthcare provider.

Neo-Mercazole is contraindicated in patients with known hypersensitivity to carbimazole or methimazole, those with severe liver disease, and individuals with a history of agranulocytosis caused by antithyroid drugs. Caution is also advised for patients with pre‑existing bone marrow disorders.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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