Metizol

Thiamazole, the active ingredient in Metizol, is an antithyroid agent presented as a tablet for oral use. It reduces thyroid hormone production in adults with hyperthyroidism and related disorders.

GNH USA supplies Metizol as a licensed, GDP-compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide.

Metizol is an antithyroid medication used to manage conditions caused by excess thyroid hormone production. - Hyperthyroidism: controls overproduction of thyroid hormones and alleviates symptoms. - Graves disease: helps achieve remission of autoimmune hyperthyroidism. - Toxic multinodular goiter: reduces hormone output from autonomous nodules. - Thyroid storm prophylaxis: prevents acute life‑threatening hyperthyroid crisis.

Adverse reactions may range from mild to severe and should be monitored during therapy.

Common Side Effects: - Nausea: mild gastrointestinal upset. - Skin rash: erythematous or pruritic lesions. - Taste disturbances: altered or metallic taste. - Arthralgia: joint pain without swelling. - Headache: mild to moderate intensity. - Mild leukopenia: slight reduction in white blood cells.

Serious or Rare Side Effects: - Agranulocytosis: severe drop in neutrophils, risk of infection. - Hepatotoxicity: elevated liver enzymes or liver injury. - Vasculitis: inflammation of blood vessels. - Severe neutropenia: marked decrease in neutrophil count. - Stevens‑Johnson syndrome: severe skin and mucous membrane reaction. - Aplastic anemia: bone‑marrow failure leading to pancytopenia.

Before initiating therapy, clinicians should assess baseline labs and consider patient‑specific risk factors. - Monitor blood counts: perform regular CBC to detect agranulocytosis early. - Assess liver function: periodic LFTs are recommended. - Avoid in pregnancy: category D, potential fetal harm. - Caution in elderly: increased sensitivity and higher risk of adverse events. - Adjust based on thyroid function: frequent TSH monitoring to guide dose changes. - Store at room temperature: keep in the original pack, protect from moisture.

Thiamazole can alter the activity of several concomitant medicines; interactions vary in clinical significance.

Major Interactions (Avoid): - Lithium: combined use may exacerbate hypothyroidism. - Warfarin: thiamazole can potentiate anticoagulant effect, increasing bleeding risk. - Amiodarone: additive effects on thyroid hormone levels.

Moderate Interactions (Monitor Closely): - Oral contraceptives: reduced efficacy, consider alternative contraception. - Theophylline: increased metabolism may lower thiamazole levels. - Rifampin: induces hepatic enzymes, potentially decreasing thiamazole effectiveness.