Product image of Neomercazole 5 (Carbimazole) supplied by GNH India

Neomercazole 5

Active Ingredient:
Carbimazole
Origin:
EU

Neomercazole 5 (Carbimazole)

Carbimazole, the active ingredient in Neomercazole 5, is a thionamide presented as oral tablets for oral use. It is used to treat hyperthyroidism, including Graves disease, by reducing excess thyroid hormone production in adults.
GNH India supplies Neomercazole 5 as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide.

Manufacturer / TM Owner

Amdipharm Uk Limited

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Indications & Clinical Uses

Neomercazole (carbimazole) is employed in the management of disorders characterized by excess thyroid hormone production.

  • Hyperthyroidism: normalises elevated thyroid hormone levels and alleviates associated symptoms.
  • Graves disease: controls autoimmune over‑activity of the thyroid gland.
  • Toxic multinodular goitre: reduces hormone output from autonomously functioning nodules.

How It Works

  • Carbimazole is converted in vivo to its active metabolite methimazole, which inhibits thyroid peroxidase. This blockade prevents iodination of tyrosine residues in thyroglobulin and coupling reactions, thereby decreasing synthesis of thyroxine (T4) and triiodothyronine (T3). The reduced hormone output lowers circulating thyroid hormone concentrations and mitigates the clinical manifestations of hyperthyroidism.

Side Effects

Carbimazole may cause a range of adverse reactions, from mild to potentially life‑threatening.

Common Side Effects

  • Rash or mild skin irritation
  • Nausea or vomiting
  • Taste disturbance or loss of taste
  • Arthralgia or muscle aches
  • Headache
  • Mild abdominal discomfort

Serious or Rare Side Effects

  • Agranulocytosis (dangerously low white‑blood‑cell count)
  • Severe liver injury or hepatitis
  • Vasculitis (inflammation of blood vessels)
  • Aplastic anemia
  • Stevens‑Johnson syndrome or toxic epidermal necrolysis
  • Severe neutropenia with risk of infection

Precautions & Warnings

Before initiating therapy, clinicians should consider several safety measures.

  • Thyroid function monitoring: check TSH, free T4 and free T3 regularly to adjust dose.
  • Dose adjustment: titrate based on clinical response and laboratory values.
  • Pregnancy caution: use only when benefits outweigh risks, as carbimazole is category D.
  • Liver disease: avoid or use with caution in patients with hepatic impairment.
  • Infection vigilance: advise patients to report fever or sore throat promptly.
  • Store at ambient temperature: keep below 25°C, retain in original packaging, protect from moisture.

Avoid Interactions

Carbimazole can affect, and be affected by, several other medicines.

Major Interactions (Avoid)

  • Levothyroxine: concurrent use may require careful dose balancing to avoid over‑ or under‑replacement.
  • Warfarin: carbimazole can potentiate anticoagulant effect, increasing INR.
  • Amiodarone: may exacerbate thyroid dysfunction when used together.

Moderate Interactions (Monitor Closely)

  • Cimetidine: can increase carbimazole plasma levels, necessitating monitoring.
  • Sulfonylureas: enhanced hypoglycaemic effect may occur.
  • Oral contraceptives: may alter thyroid hormone binding and require thyroid function checks.

Frequently Asked Questions

Neomercazole contains carbimazole, an antithyroid thionamide prescribed to manage hyperthyroidism, including Graves disease and toxic multinodular goitre, by lowering excess thyroid hormone production.

Carbimazole is metabolised to methimazole, which blocks thyroid peroxidase. This inhibition stops iodine incorporation and coupling of tyrosine residues in thyroglobulin, reducing synthesis of T4 and T3 and thereby decreasing circulating thyroid hormone levels.

The appropriate dose of Neomercazole is determined by the prescribing clinician based on the severity of hyperthyroidism, patient weight, age, and laboratory results. Dosage regimens are individualized and should not be altered without medical advice.

Carbimazole is classified as pregnancy category D, indicating potential risk to the fetus. It should be used only when the therapeutic benefit justifies the risk. Use during breastfeeding is not recommended unless the benefits outweigh potential infant exposure.

To place an order, submit an enquiry on the Neomercazole 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.

Carbimazole (Neomercazole) and propylthiouracil are the main thionamides. Carbimazole is generally preferred for long‑term management because it has a more predictable pharmacokinetic profile and fewer hepatotoxic concerns than propylthiouracil, though both require regular monitoring.

Neomercazole tablets should be stored at ambient temperature, preferably below 25 °C, in their original container, protected from moisture and direct sunlight to maintain potency.

Neomercazole is taken orally, usually once daily or in divided doses as directed by the prescriber. Tablets should be swallowed whole with water and taken at the same time each day to ensure consistent blood levels.

The most serious adverse events include agranulocytosis, severe liver injury, and rare immune‑mediated reactions such as vasculitis or Stevens‑Johnson syndrome. Patients should seek immediate medical attention for fever, sore throat, jaundice, or skin rash.

Neomercazole is contraindicated in patients with known hypersensitivity to carbimazole or methimazole, those with severe liver disease, and in pregnant women unless the benefit outweighs the risk. It should also be avoided in individuals with a history of agranulocytosis.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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