Trecator SC (Ethionamide)

Trecator SC
4.84 ratingsReviews
Generic:
Ethionamide
Indications:
tuberculosis
Analogs:
Prothionamide Linezolid Bedaquiline Delamanid Pretomanid Clofazimine Cycloserine Terizidone Levofloxacin Moxifloxacin Seromycin Aminosalicylic Acid Paser Capreomycin Sirturo Isoniazid Pyrazinamide Ethambutol Streptomycin
In stock: 18 packs
AdultsPregnancyAllergiesDiabetesBreastfeedingChildrenDriving

Dosages

Trecator SC 250 mg

Quantity Price per tablet You save Total price
20 £3.19 - £63.71
30 £2.89 £8.89 £86.67
40 £2.78 £16.30 £111.12
60 £2.67 £31.11 £160.01
90 £2.59 £53.34 £233.35
120 £2.56 £75.56 £306.69
180 £2.51 £121.49 £451.89

Manufacturers

Sanofi-AventisSun Pharmaceutical Industries Ltd.Wyeth Pharmaceuticals

Payment & Delivery

Package Example

Your order is carefully packed and is dispatched within 24 hours. Here is what a typical package looks like.

Sized like a regular personal letter (approximately 24x11x0.7 cm), with no indication of what is inside.

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Delivery Times
Delivery MethodEstimated delivery
Express Free for orders over £222.24Estimated delivery to the UK: 4-7 days
Standard Free for orders over £148.16Estimated delivery to the UK: 14-21 days
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FAQ

A prescription is required to obtain ethionamide from local pharmacies in the United Kingdom, where treatment also requires specialist clinical oversight. Our store policy allows Trecator SC to be ordered without a prescription and sent by mail. Our store ordering policy is separate from the medicine's UK prescription status.

No. Ethionamide is used as part of a planned combination treatment for tuberculosis, and symptom improvement does not show that the infection has been fully treated. Stopping early or taking it alone can contribute to treatment failure and drug resistance. Continue only for the duration set by the tuberculosis specialist.

Contact the tuberculosis team or prescriber for reassessment rather than changing the dose, extending treatment or adding medicines yourself. Tuberculosis response is assessed using clinical review and appropriate tests, not symptoms alone. Seek prompt medical advice for worsening symptoms or troublesome adverse effects.

A generic ethionamide medicine contains ethionamide as its active ingredient, the same active ingredient used in the reference brand. Packaging, tablet appearance and inactive ingredients may differ between products. The exact manufacturer and excipients of the supplied pack should be checked on its label.

This product is available as 250 mg sugar-coated tablets for oral use. No other strength is listed for this product.

Ethionamide is an antitubercular medicine used in combination regimens for pulmonary and extrapulmonary tuberculosis, particularly when other tuberculosis medicines have failed, cannot be used or resistance is present. It is not used alone because resistance can develop. It may also be used in selected treatment regimens for leprosy.

Ethionamide should generally be avoided during pregnancy because animal studies have shown fetal harm and safer alternatives are preferred where possible. If treatment is being considered during pregnancy, a tuberculosis specialist must weigh the maternal benefit against fetal risk. Breastfeeding also requires individual clinical advice because information on transfer into breast milk and infant safety is limited.

These 250 mg sugar-coated tablets are taken by mouth as part of a combination tuberculosis regimen. They may be taken with or without food; taking them with food can reduce stomach upset. The daily dose, timing and whether doses are divided are determined by the treating specialist, taking account of body weight, other tuberculosis medicines and tolerability.

Description

Note: Images in the description are provided for informational purposes and may differ from the actual appearance of the product. Please refer to the product name, strength, active ingredients, and pharmaceutical form.

Uses

Tuberculosis

Active Tuberculosis

Trecator (ethionamide) is used with other anti-tuberculosis medicines to treat active tuberculosis, mainly when Mycobacterium tuberculosis is resistant to isoniazid or rifampicin, or when these medicines cannot be used because of intolerance. Ethionamide should not be used on its own because resistance can develop quickly.

Standard regimens for drug-susceptible pulmonary tuberculosis usually last at least 6 months (about 26 weeks). Treatment for drug-resistant tuberculosis is individualised and often lasts longer; in the UK, patients should be managed in consultation with an expert in drug-resistant TB.

Ethionamide

If ethionamide is added as a new medicine to a regimen in patients with proven or suspected drug-resistant tuberculosis, it should be given with other active medicines based on susceptibility testing.

Other Mycobacterial Infections

Ethionamide has been used off-label as part of salvage regimens for some non-tuberculous mycobacterial infections. It should only be used in this way under the guidance of clinicians experienced in treating these infections.

Clinical Studies in the United Kingdom
In the United Kingdom, clinical research on ethionamide has mainly taken place in the setting of multidrug-resistant tuberculosis, often as part of combination regimens rather than as a treatment on its own. UK studies and case series have looked at treatment outcomes, tolerability and side effects, with common concerns including gastrointestinal intolerance, hepatotoxicity and hypothyroidism. Ethionamide has also been included in pharmacokinetic studies and regimen-optimisation work linked to specialist TB centres and national surveillance cohorts. Overall, the UK literature is limited and largely observational, reflecting its use in complex, resistant TB cases rather than in large randomised trials.

Administration

Ethionamide is taken by mouth.

Ethionamide tablets can be taken with or without food. If stomach upset occurs, taking the dose with food or at bedtime and/or dividing the daily dose may help improve tolerability.

Dosage

Active Tuberculosis

When treating active tuberculosis, ethionamide should not be given on its own. The usual adult dose when used with other anti-tuberculosis medicines is 15-20 mg/kg/day (maximum 1 g (1,000 mg) daily). The dose may be taken once daily or, if GI intolerance occurs, in divided doses.

Starting treatment with 250 mg daily and gradually increasing to the best tolerated dose may be helpful. One reported regimen uses ethionamide 250 mg daily for 1-2 days, followed by 250 mg twice daily for 1-2 days, then increased to 1 g (1,000 mg) daily in 3 or 4 divided doses.

Pediatric Dosage

Because data are limited, ethionamide generally should not be used in children younger than 12 years unless the organisms are clearly resistant to first-line treatment and systemic spread or other life-threatening complications of tuberculosis are considered likely. Recommended paediatric dosing in reference sources ranges from 10-20 mg/kg/day (up to 1 g (1,000 mg) daily) given in 2 or 3 divided doses; once-daily dosing has also been used in some situations under specialist supervision.

Cautions

GI Effects

Gastrointestinal problems are the most common side effects of ethionamide and may be dose related. These include nausea, vomiting, diarrhoea, abdominal pain, excessive salivation, metallic taste, stomatitis, loss of appetite and weight loss. They may be reduced by lowering the dose, changing when the medicine is taken, dividing the daily dose, or using anti-sickness treatment where appropriate.

Nervous System and Special Senses Effects

Psychiatric and neurological effects (for example low mood, restlessness, drowsiness, dizziness and headache) have been reported. Rarely, peripheral neuritis, paraesthesia, seizures, tremor, hallucinations, diplopia, optic neuritis and blurred vision have occurred. Some clinicians use pyridoxine (vitamin B6) to help prevent or manage neuropathy, especially when other neurotoxic anti-tuberculosis medicines are used at the same time.

Hepatic Effects

Temporary increases in serum bilirubin and transaminases (AST/ALT) have been reported. Hepatitis, with or without jaundice, has also been reported. Hepatotoxicity is generally reversible after the medicine is stopped.

Severe Skin Reactions

Severe skin reactions (for example Stevens-Johnson syndrome, toxic epidermal necrolysis, DRESS and AGEP) have been reported with anti-tuberculosis drug combinations that included ethionamide. If symptoms or signs of a severe skin reaction occur, stop the suspected medicine or medicines immediately and seek urgent medical care.

Precautions and Contraindications

Ethionamide is contraindicated in patients with severe hepatic impairment and in patients who are hypersensitive to the medicine.

Serum transaminases (AST/ALT) should be checked before treatment starts and monitored monthly during treatment. If transaminase levels become raised, ethionamide and the accompanying anti-tuberculosis medicine or medicines may be stopped temporarily until the abnormalities resolve, then reintroduced one by one to identify the causative agent or agents.

Eye examinations (including ophthalmoscopy) should be carried out before treatment and periodically during treatment. Patients in the United Kingdom should be advised to speak to their clinician if blurred vision or any loss of vision, with or without eye pain, occurs.

Blood glucose should be checked before treatment and periodically during treatment; people with diabetes should watch for episodes of hypoglycaemia. Periodic monitoring of thyroid function is recommended, as hypothyroidism, with or without goitre, has been reported.

Pregnancy and Lactation

Safe use of ethionamide during pregnancy has not been established. Animal studies indicate teratogenic potential, and ethionamide should generally be avoided in women who are pregnant or likely to become pregnant unless the clinician considers it an essential part of treatment.

Because there is no information on whether ethionamide passes into human milk, it should only be given to breastfeeding mothers if the benefits outweigh the risks. Breastfed infants should be monitored for side effects.

Drug Interactions

Antituberculosis Agents

Ethionamide has been reported to temporarily increase serum concentrations of isoniazid. Ethionamide may increase the side effects of other anti-tuberculosis medicines given at the same time. Convulsions have been reported when ethionamide is used with cycloserine; caution is needed when a regimen includes both medicines.

Excessive alcohol intake should be avoided because a psychotic reaction has been reported.

Mechanism of Action

Ethionamide may be bacteriostatic or bactericidal depending on the concentration of the medicine at the site of infection and the susceptibility of the organism. The exact mechanism of action has not been fully established; ethionamide appears to inhibit peptide synthesis in susceptible organisms.

Pharmacokinetics

Absorption

Ethionamide is almost completely absorbed after oral administration and does not undergo any appreciable first-pass metabolism. Ethionamide tablets may be taken without regard to meals.

Distribution

Ethionamide is widely distributed into body tissues and fluids and is approximately 30% bound to plasma proteins. Significant concentrations have been reported in cerebrospinal fluid in studies using earlier formulations.

Elimination

The mean half-life reported for the film-coated tablet is approximately 1.9 hours. Less than 1% of an oral dose is excreted in the urine as ethionamide.

In the United Kingdom, ethionamide is regulated and approved by the Medicines and Healthcare products Regulatory Agency.

Storage

Store at 20-25°C (68-77°F). Dispense in a tightly closed container and keep the container tightly closed.

Medically reviewed by
Donna Brettler
BPharm, MPH - Pharmacologist and medical writer
Updated 11 August 2026

Customer questions

Asked by Alfie K, Newry, United Kingdom

I'm in Newry and want to avoid placing an order that cannot be delivered to Northern Ireland. Can I check this before I pay?

Answered by Support team

Yes. Enter your Newry delivery address during checkout and review the delivery options shown before payment. Availability is confirmed from the options presented for that address.

Asked by Daniel Wilson, Newcastle upon Tyne, United Kingdom

I live in Newcastle upon Tyne. Where can I check whether Trecator SC can be delivered to my postcode before ordering?

Answered by Support team

Enter your Newcastle upon Tyne postcode and address at checkout before payment. The checkout will show the delivery options available for that destination.

Asked by Hannah Patel, Coventry, United Kingdom

My order to Coventry has been marked as dispatched. Does that mean it will arrive tomorrow?

Answered by Support team

Not necessarily. Dispatch means the parcel has left for delivery; arrival depends on the delivery service selected for Coventry. Express delivery is estimated at 4-7 days and includes tracking, while Standard delivery is typically 14-21 days without tracking.

Asked by Joshua H, Manchester, United Kingdom

My specialist has given me a treatment plan and I need to compare pack sizes before ordering. Which tablet quantities are listed for this product?

Answered by Support team

The listed pack quantities are 20, 30, 40, 60, 90, 120 and 180 tablets. All listed options are for the 250 mg sugar-coated ethionamide tablet.

Asked by James Carter, London, United Kingdom

I have had pins and needles in my feet before, and my TB team is considering ethionamide. Is there anything relevant I should raise with them?

Answered by Support team
Medical reviewed by Donna Brettler

Yes. Ethionamide can cause or worsen peripheral nerve symptoms, so tell the TB team about previous tingling, numbness or burning pain. Pyridoxine (vitamin B6) is often prescribed alongside it to reduce neurotoxicity risk, and new or worsening symptoms should be reported promptly.

Product specifications

Active ingredientEthionamide
Drug classAntitubercular agent
Dosage formSugar-coated tablet
Available strengths250 mg
RouteOral
StorageStore at controlled room temperature, 20°C to 25°C.
ATC codeJ04AD03

Regulatory information

Licensing statusEthionamide is not currently licensed for human use in the United Kingdom.

More information