CARBIZOLE 5

CARBIZOLE 5 (Carbimazole 5 mg) is a prescription anti-thyroid tablet used to treat hyperthyroidism, including Graves' disease and toxic nodular goitre. It works by blocking the thyroid gland's ability to produce excess thyroid hormone (T3 and T4), gradually bringing thyroid function back to normal. It is also prescribed before thyroid surgery or radioactive iodine therapy to stabilise thyroid levels. Carbimazole is a prodrug — the liver converts it into its active form, methimazole, which does the actual work of slowing hormone production. It is a Schedule H medicine and must only be taken under medical supervision, with regular blood tests to monitor thyroid function and blood counts.

Product Information Table

What Is CARBIZOLE 5 (Carbimazole 5 mg) Used For?

CARBIZOLE 5 belongs to a class of medicines called thionamide anti-thyroid drugs. The thyroid gland, located in the front of your neck, normally produces a carefully balanced amount of thyroid hormone to regulate metabolism, heart rate, body temperature, and energy levels. In hyperthyroidism, the gland becomes overactive and pumps out too much hormone, speeding up nearly every process in the body.

Doctors prescribe carbimazole 5 mg for several related conditions:

• Graves' disease — the most common autoimmune cause of hyperthyroidism, where the immune system mistakenly stimulates the thyroid to overproduce hormone.
• Toxic multinodular goitre — an enlarged thyroid with multiple overactive nodules producing excess hormone.
• Toxic adenoma (single hot nodule) — one overactive nodule driving hormone excess.
• Pre-surgical thyroid stabilisation — used for weeks before thyroidectomy to bring hormone levels down and reduce surgical risk.
• Pre-radioactive iodine (RAI) therapy — used to control symptoms and normalise thyroid levels before or sometimes after RAI treatment.
• Thyrotoxic crisis (thyroid storm) management — as part of a broader emergency treatment protocol, under hospital supervision.

Because thyroid hormone affects almost the entire body, untreated hyperthyroidism can lead to a racing heart, unintended weight loss, anxiety, heat intolerance, tremors, and in severe or long-standing cases, heart rhythm problems or bone loss. Correcting hormone levels with carbimazole helps reverse or prevent these downstream effects.

How Carbimazole Works 

Carbimazole itself is inactive. Once swallowed, it is rapidly and almost completely converted in the liver to its active metabolite, methimazole (thiamazole). Methimazole then travels to the thyroid gland and blocks the enzyme thyroid peroxidase, which the gland needs to attach iodine to the protein thyroglobulin — a critical step in building new thyroid hormone (T3 and T4).

Because carbimazole blocks new hormone synthesis rather than removing hormone already stored in the gland, its effects are not instant. Most patients begin noticing symptom improvement over 2 to 4 weeks, with thyroid hormone levels typically normalising within 4 to 8 weeks of consistent use, depending on the starting severity and dose. This is why doctors schedule follow-up thyroid function tests (TSH, free T4, free T3) roughly every 4-6 weeks during the early treatment phase, adjusting the dose as levels improve.

Key Benefits of CARBIZOLE 5

• Reduces excess thyroid hormone production, addressing the root cause of hyperthyroid symptoms rather than just masking them.
• Non-surgical, non-radioactive option for long-term hyperthyroidism control in many patients, particularly younger patients or those with mild-to-moderate Graves' disease.
• Prepares the body safely for surgery or radioactive iodine by normalising hormone levels beforehand, lowering the risk of complications like thyroid storm during the procedure.
• Flexible, titratable dosing — the 5 mg strength allows fine dose adjustment as thyroid function tests improve, following either the "titration" or "block-and-replace" treatment strategy your doctor selects.
• Can induce long-term remission in a meaningful proportion of Graves' disease patients after a full 12-18 month treatment course, in some cases allowing the medicine to be stopped altogether under medical guidance.

Dosage Information

• Starting dose (adults): Typically higher initial doses are used to bring hormone levels down quickly, then gradually reduced ("titrated") as blood tests normalise. The 5 mg tablet strength is commonly used both as a starting building block and, importantly, as a maintenance dose once hormone levels stabilise.
• Maintenance dose: Often a low daily dose, frequently in the 5 mg to 15 mg per day range, split as advised, continued for many months.
• Administration: Taken orally, generally at the same time(s) each day, with or without food, swallowed with a glass of water. Consistency in timing helps maintain steady drug levels.
• Duration: Treatment courses commonly run 12 to 18 months for Graves' disease, though duration varies by condition and response. Never stop or change the dose without medical advice — see the section below on stopping suddenly.
• Missed dose: Take it as soon as remembered unless it is almost time for the next dose; do not double up.
• Elderly, renal, or hepatic impairment: May require dose adjustment and closer monitoring — always disclose your full medical history to your doctor.

Side Effects of Carbimazole

Common Side Effects

• Mild skin rash or itching
• Nausea or mild stomach upset
• Headache
• Joint pain
• Altered or metallic taste sensation
• Mild hair thinning

Serious Side Effects (Seek Immediate Medical Attention)

• Signs of agranulocytosis (a rare but serious drop in white blood cells): sudden fever, sore throat, mouth ulcers, or signs of infection — this requires an immediate blood test and urgent medical attention, and is the single most important safety warning associated with carbimazole.
• Signs of liver problems: yellowing of skin or eyes (jaundice), dark urine, severe fatigue, or right-upper-abdominal pain.
• Severe skin reactions: widespread rash, blistering, or peeling skin.
• Vasculitis symptoms: unexplained bruising, joint pain with rash, or blood in urine.
• Signs of low blood sugar or unusual bleeding/bruising should also be reported promptly.

Carbimazole vs Other Anti-Thyroid Options

Precautions and Safety Information

• Regular blood monitoring is essential — both thyroid function tests and complete blood counts, especially in the first few months of treatment.
• Pregnancy and breastfeeding: Carbimazole requires specialist discussion; alternative anti-thyroid drugs may be preferred during early pregnancy. Never start or continue without obstetric and endocrine guidance.
• Do not stop treatment abruptly without medical advice — see FAQ below on why sudden discontinuation is risky.
• Inform your doctor of all other medications, including blood thinners, other thyroid medicines, and over-the-counter supplements, to avoid interactions.
• Report fever, sore throat, or mouth ulcers immediately — this is the single most important safety instruction for anyone taking this medicine.
• Avoid alcohol in excess, as it can add strain to the liver alongside the medicine.
• Not for use in known carbimazole/methimazole allergy or in patients with a history of severe bone marrow suppression from these drugs.
• Driving/operating machinery: Generally not directly impaired, but fatigue during untreated or unstable thyroid states can affect alertness.

Buyer Intent & Transactional Information

CARBIZOLE 5 (Carbimazole 5 mg Tablet) is manufactured and marketed by Steris Healthcare Pvt. Ltd., a WHO-GMP and ISO-certified pharmaceutical company based in India, supplying quality-assured medicines through its trusted distribution network.

• Available as: Tablet, pack of 100 tablets
• Prescription requirement: Schedule H — a valid doctor's prescription is mandatory for purchase
• Where to buy: Available through Steris Healthcare's authorised stockist and distributor network across India, as well as via sterisonline.com
• Bulk/institutional/PCD franchise enquiries: Contact Steris Healthcare directly for pricing, MOQ, and distribution partnership details

Frequently Asked Questions 

1. What is carbimazole 5 mg used for?
Carbimazole 5 mg is used to treat hyperthyroidism (an overactive thyroid), including Graves' disease and toxic nodular goitre, by reducing excess thyroid hormone production.

2. How does carbimazole work in the body?
It is converted in the liver to methimazole, which blocks the thyroid gland's ability to make new thyroid hormone, gradually lowering elevated hormone levels.

3. How long does carbimazole take to work?
Most people notice symptom improvement in 2 to 4 weeks, with thyroid hormone levels typically normalising over 4 to 8 weeks of regular use.

4. Is carbimazole 5 mg the same as methimazole?
Not exactly — carbimazole is a prodrug that the liver converts into methimazole, the active compound that actually blocks thyroid hormone production.

5. What are the common side effects of carbimazole?
Common side effects include mild rash, nausea, headache, joint pain, and altered taste sense, which often settle as the body adjusts.

6. What is the most serious side effect to watch for with carbimazole?
The most serious concern is agranulocytosis — a sudden drop in white blood cells causing fever, sore throat, or mouth ulcers — which needs urgent medical attention.

7. Can I stop taking carbimazole suddenly?
No, carbimazole should not be stopped abruptly without medical advice, as this can cause thyroid hormone levels to rebound and symptoms to return or worsen.

8. Is carbimazole safe during pregnancy?
Carbimazole requires careful specialist discussion during pregnancy, particularly in the first trimester, when an alternative anti-thyroid medicine may be preferred.

9. Can I drink alcohol while taking carbimazole?
It's best to limit alcohol, as excessive intake can add extra strain to the liver alongside the medicine's own metabolism.

10. Does carbimazole cause weight gain?
As thyroid hormone levels normalise, metabolism slows toward a healthy rate, which can sometimes lead to modest weight gain compared to the weight loss seen during untreated hyperthyroidism.

11. How long do I need to take carbimazole for Graves' disease?
Treatment courses commonly last 12 to 18 months, though your doctor will determine the exact duration based on your response and blood test results.

12. Do I need blood tests while taking carbimazole?
Yes, regular thyroid function tests and complete blood counts are essential to monitor treatment progress and catch rare side effects early.

13. Can carbimazole be taken with food?
Yes, it can generally be taken with or without food, though it's best taken at a consistent time each day.

14. What happens if I miss a dose of carbimazole?
Take the missed dose as soon as you remember, unless it's almost time for your next dose — in that case, skip it and continue your regular schedule without doubling up.

15. Is carbimazole 5 mg available without a prescription?
No, carbimazole is a Schedule H medicine in India and requires a valid prescription from a registered doctor for purchase.

16. Where can I buy CARBIZOLE 5 tablets in India?
CARBIZOLE 5 is available through Steris Healthcare's authorised distributor and stockist network across India and via sterisonline.com, subject to a valid prescription.

17. What is the price of carbimazole 5 mg?
Pricing for CARBIZOLE 5 depends on pack size and location — check the current price with your nearest stockist or through Steris Healthcare's official channels.

18. Can carbimazole be used before thyroid surgery?
Yes, doctors often prescribe carbimazole for several weeks before thyroid surgery to normalise hormone levels and reduce surgical risk.

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