Zeptol CR 400 Mg Tablets

Description

<![CDATA[

Zeptol CR 400 Mg Tablets

Zeptol CR 400 Mg Tablets contain carbamazepine 400 mg in a controlled-release formulation. Carbamazepine is a first-generation antiepileptic drug also used in the management of trigeminal neuralgia and as a mood stabiliser in bipolar disorder. The controlled-release (CR) formulation provides more stable plasma drug levels than immediate-release preparations, reducing peak-related side effects and enabling twice-daily dosing in most patients.

Composition

About the Manufacturer

Zeptol CR is manufactured by Sun Pharmaceutical Industries Limited, one of the world’s largest specialty generic pharmaceutical companies. Sun Pharma has an extensive central nervous system portfolio and distributes to regulated markets worldwide.

Mechanism of Action

Carbamazepine stabilises inactivated sodium channels in neuronal membranes, reducing repetitive high-frequency firing of action potentials. This action suppresses the spread of seizure activity. It also modulates calcium channels and potentiates GABAergic inhibition. In trigeminal neuralgia, it blocks ectopic impulse generation in affected peripheral nerves. Its mood-stabilising properties in bipolar disorder are thought to relate to multiple mechanisms including inhibition of adenylate cyclase and modulation of glutamate receptors.

Indications

• Partial seizures (simple and complex) with or without secondary generalisation
• Generalised tonic-clonic seizures
• Trigeminal neuralgia
• Bipolar disorder (mood stabilisation, particularly manic episodes)
• Alcohol withdrawal (adjunct use)

Dosage & Administration

• Epilepsy (adults): Initially 100–200 mg once or twice daily; increase gradually to 800–1200 mg daily in 2 divided doses (CR); maximum 1600 mg/day
• Trigeminal neuralgia: Initially 100 mg twice daily; increase by 100–200 mg every 12 hours until pain relief; usual range 400–800 mg daily
• Bipolar disorder: 400–600 mg daily increasing to 800–1200 mg daily; titrate to response
• Swallow CR tablets whole; do not crush or chew
• Can be taken with food to reduce GI effects

Special Populations

• Elderly: Start at lower doses; increased risk of hyponatraemia and CNS side effects
• Hepatic impairment: Use with caution; avoid in severe liver disease
• Renal impairment: No significant dose adjustment required; active metabolite may accumulate
• Pregnancy: Associated with neural tube defects and other congenital anomalies; folic acid supplementation required; specialist monitoring essential
• Breastfeeding: Passes into breast milk; use with caution; monitor infant for drowsiness

Precautions

• HLA-B*1502 allele carriers (South and Southeast Asian populations) have significantly increased risk of Stevens-Johnson syndrome; genetic testing is recommended before starting therapy in these populations
• Monitor full blood count and liver function before and during treatment
• Can cause hyponatraemia; monitor sodium especially in elderly patients and those on diuretics
• May exacerbate absence and myoclonic seizures; use is not recommended in these seizure types
• Carbamazepine is a potent enzyme inducer; many drug interactions apply – review all concomitant medications before starting

Contraindications

• Hypersensitivity to carbamazepine, tricyclic antidepressants, or any excipient
• AV heart block
• Acute porphyria
• Bone marrow depression or history of serious haematological reaction to any drug
• Concomitant use with MAOIs (wait at least 14 days after stopping MAOIs)
• HLA-B*1502 positive status (relative contraindication; screening recommended)

Side Effects

• Common: Dizziness, ataxia, drowsiness, diplopia, nausea, vomiting (especially at treatment initiation)
• Less common: Hyponatraemia, skin rash, leucopenia, elevated liver enzymes
• Rare: Aplastic anaemia, agranulocytosis, Stevens-Johnson syndrome, toxic epidermal necrolysis, serious hepatotoxicity, DRESS (drug reaction with eosinophilia and systemic symptoms)

Drug Interactions

• Oral contraceptives: Carbamazepine reduces contraceptive efficacy; additional contraceptive precautions are needed
• Warfarin: Reduces anticoagulant effect; INR monitoring required
• Antiepileptics (phenytoin, valproate, lamotrigine): Complex bidirectional interactions; plasma level monitoring recommended
• CYP3A4 inhibitors (ketoconazole, clarithromycin, erythromycin): Increase carbamazepine levels; risk of toxicity
• MAOIs: Contraindicated; risk of serious adverse reactions

Storage

Store below 30°C in a dry place, away from direct light. Keep out of the reach of children. Do not use after the expiry date printed on the pack.

Related Products

• Zeptol CR 200 Mg Tablets – lower-strength carbamazepine CR for dose titration
• Intalith CR 450 Mg Tablets – lithium carbonate CR for bipolar disorder
• Folvite 5 Mg Tablets – folic acid supplementation during carbamazepine therapy

Frequently Asked Questions

What is Zeptol CR 400 Mg used for?

Zeptol CR 400 Mg is used to control epileptic seizures, treat the severe facial pain of trigeminal neuralgia, and stabilise mood in bipolar disorder.

What is the difference between Zeptol and Zeptol CR?

Zeptol CR is a controlled-release formulation that releases carbamazepine slowly over time, providing more stable blood levels, fewer peak-related side effects, and usually once- or twice-daily dosing instead of three to four times daily with immediate-release tablets.

Can I crush or chew Zeptol CR tablets?

No. Zeptol CR tablets must be swallowed whole. Crushing or chewing destroys the controlled-release mechanism, releases the drug too rapidly, and may cause toxicity.

Is carbamazepine safe in pregnancy?

Carbamazepine carries a risk of neural tube defects and other congenital malformalities. Women of childbearing age should use effective contraception. If pregnancy is planned, specialist advice and high-dose folic acid supplementation are essential before stopping or changing therapy.

Why is genetic testing recommended before starting carbamazepine?

Carriers of the HLA-B*1502 gene variant, common in some Asian populations, have a substantially increased risk of serious skin reactions (Stevens-Johnson syndrome). Genetic testing before starting carbamazepine is recommended in these populations.

References

1. NHS – Carbamazepine
2. MedlinePlus – Carbamazepine
3. FDA – Carbamazepine Prescribing Information
4. EMA – Carbamazepine-containing Medicinal Products

Disclaimer: This page is for informational purposes only and does not replace medical advice. Zeptol CR 400 Mg Tablets must be prescribed and monitored by a qualified neurologist or psychiatrist. Never stop carbamazepine suddenly without medical guidance, as this can trigger seizures. Report any unexplained rash, mouth sores, bruising, or yellowing of skin to your doctor immediately.

]]>