Lonax

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What Is Lonax?

Lonax is an oral oxcarbazepine tablet available in 150 mg, 300 mg strengths. Oxcarbazepine is a 10-keto analogue of carbamazepine developed in the 1990s to retain carbamazepine’s efficacy while removing the active metabolite (carbamazepine-10,11-epoxide) responsible for many of carbamazepine’s side effects and drug interactions. The result is a chemically related drug with substantially better tolerability and a much simpler interaction profile.

Lonax is supplied by a WHO-GMP certified manufacturer and is bioequivalent to originator-brand oxcarbazepine (Trileptal®, Novartis).

How Does Lonax Work?

Oxcarbazepine is a prodrug rapidly reduced to its active metabolite 10-monohydroxy-derivative (MHD, eslicarbazepine):

• Voltage-gated sodium channel blockade in a use-dependent manner — the primary anticonvulsant mechanism. It silences hyperactive neurons preferentially.
• Modulation of high-voltage-activated calcium channels — reduces excitatory transmission.
• Increased potassium conductance — further reduces excitability.

Unlike carbamazepine, oxcarbazepine does not strongly induce CYP3A4, so it has fewer interactions with other drugs (statins, anticoagulants, oral contraceptives are less affected, although high doses still reduce contraceptive efficacy). It does not auto-induce its own metabolism, which means dose increases produce predictable level changes — clinically simpler than carbamazepine.

Bruk og indikasjoner

• Partial-onset (focal) seizures with or without secondary generalisation — monotherapy and adjunctive (FDA-approved in adults and children >2 years)
• Off-label: trigeminal neuralgia (alternative to carbamazepine, often better tolerated), bipolar disorder maintenance (mostly historical, not first-line), neuropathic pain

Lonax is ikke first-line for: primary generalised tonic-clonic seizures (use lamotrigine or valproate), absence or myoclonic seizures (can worsen them — class effect of sodium-channel blockers in genetic generalised epilepsy), or acute mania.

Lonax Dosage and How to Take

Lonax strengths: 150 mg, 300 mg.

Standard adult dosing:

• Monotherapy: Start 300 mg twice daily. Increase by 300 mg/day every 3 days as tolerated. Maintenance 1,200–2,400 mg/day in 2 doses.
• Adjunctive therapy: Start 300 mg twice daily; titrate weekly by 600 mg/day. Maintenance 1,200 mg/day (some need up to 2,400 mg/day).
• Children 2–16 years: Start 8–10 mg/kg/day in 2 doses, increase weekly to 30–46 mg/kg/day depending on weight.
• Switching from carbamazepine: use 1.5× the carbamazepine total daily dose; titrate over 2 weeks while tapering carbamazepine.
• Nyresvikt (CrCl <30 mL/min): halve the starting dose, slower titration.

How to Take Lonax Properly

1. Twice daily, evenly spaced. The active metabolite MHD has a half-life of 9 hours; twice-daily dosing maintains steady levels.
2. With or without food. Food does not significantly affect absorption; many patients take it with food to reduce nausea.
3. Baseline sodium check, then at 2 weeks and quarterly. Hyponatraemia is the single most distinctive side effect — clinically significant in 2–3% of adults, more in older adults and on diuretics.
4. Tell every prescriber. Oxcarbazepine has fewer interactions than carbamazepine but still affects oral contraceptives at doses above 1,200 mg/day.
5. Allow 2–3 weeks at therapeutic dose before judging seizure response.
6. Stop the drug for any new rash in the first 8 weeks. SJS/TEN risk is sharply increased in HLA-B*1502-positive patients (Han Chinese, Thai, Indonesian populations) — pre-treatment HLA-B*1502 testing is recommended in these populations.
7. Never stop abruptly. Rebound seizures including status epilepticus are possible. Taper over 2–4 weeks under medical supervision.
8. Driving: avoid until stable on dose — dizziness and double vision are common in the titration phase.

Side Effects of Lonax

Common (often dose-related, may settle with slower titration):

• Dizziness, unsteadiness
• Drowsiness, fatigue
• Diplopia (double vision), nystagmus
• Hodepine
• Nausea, vomiting
• Tremor, ataxia — usually with rapid titration
• Mild rash (5–10%)

Mindre vanlig, men viktig:

• Hyponatraemia — serum sodium <125 mmol/L in 2–3% of adults; symptoms include nausea, headache, lethargy, confusion, seizures (paradoxical — low sodium can lower seizure threshold). Risk factors: age >65, concurrent diuretics, CHF, SSRIs.
• Cognitive slowing
• Mood disturbance
• Akne
• Increased liver enzymes (rare)
• Reduced platelet count (rare)

Rare but seek emergency care:

• Stevens-Johnson syndrome / TEN — particularly in HLA-B*1502 carriers (Han Chinese, Thai, Indonesian populations). FDA recommends HLA-B*1502 testing before starting in these populations.
• DRESS syndrome — fever, rash, eosinophilia, hepatitis. Stop immediately.
• Severe hyponatraemia with seizures, encephalopathy
• Anaphylaxis
• Suicidal ideation — class warning
• Bone marrow suppression (very rare)

Advarsler og forholdsregler

• Hyponatraemia — the most distinctive side effect. Check sodium at baseline, 2 weeks, then quarterly. Stop or reduce dose if symptomatic or if sodium <125 mmol/L.
• Cross-reactivity with carbamazepine — ~25–30% of patients who had a rash on carbamazepine will also have a rash on oxcarbazepine. Severe carbamazepine reactions (SJS/DRESS) are a contraindication to oxcarbazepine.
• HLA-B*1502 in Han Chinese, Thai, Indonesian populations — sharply increased SJS/TEN risk. Pre-treatment genotyping is FDA-recommended.
• Kombinerte orale prevensjonsmidler — doses >1,200 mg/day can reduce contraceptive efficacy. Backup contraception or higher-oestrogen pill above this dose.
• Graviditet — classified D; reduces folate, modest increase in malformations vs population baseline. Folate 5 mg/day; specialist supervision.
• Older adults and patients on diuretics — sharply increased hyponatraemia risk. Check sodium more frequently.
• Suicidal ideation — class warning for all anticonvulsants.
• Never stop abruptly — rebound seizures.

Contraindications — Who Should NOT Take Lonax

• Known hypersensitivity to oxcarbazepine, carbamazepine, eslicarbazepine or any tablet excipient
• History of severe rash, SJS/TEN or DRESS to carbamazepine or oxcarbazepine
• Severe hyponatraemia at baseline (relative)
• Atrioventricular block (relative; sodium-channel blockers can worsen)
• Children <2 years (efficacy/safety not established)

Legemiddelinteraksjoner

Oppbevaringsinstruksjoner

• Oppbevar ved romtemperatur, 15–30°C. Protect from moisture.
• Keep tablets in the original blister pack until use.
• Do not store in the bathroom.
• Keep out of reach of children.
• Do not use after the expiry date.
• Return unused tablets to a pharmacy for proper disposal.

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Vanlige spørsmål

How is Lonax different from carbamazepine?

Oxcarbazepine is a 10-keto analogue of carbamazepine designed to remove the active epoxide metabolite responsible for many of carbamazepine’s side effects and interactions. Comparable efficacy, better tolerability, fewer drug interactions, simpler kinetics (no auto-induction). Trade-offs: oxcarbazepine causes more hyponatraemia (2–3% vs <1% for carbamazepine), and there is ~25–30% cross-reactivity for skin rashes. For most new starts in focal epilepsy, oxcarbazepine is the more comfortable choice.

Why does my prescriber check my sodium so often on Lonax?

Hyponatraemia is the most distinctive side effect of oxcarbazepine. Clinically significant low sodium (<125 mmol/L) occurs in approximately 2–3% of adults, more often in older patients, those on diuretics, and those with congestive heart failure. Symptoms range from mild headache and nausea to confusion, falls and seizures. Quarterly serum sodium is the standard practice; monthly if you have started a diuretic or had previous low sodium.

Can I take Lonax if I had a rash on carbamazepine?

Caution required. Om 25–30% of patients who had a rash on carbamazepine will also have a rash on oxcarbazepine. If your previous reaction was a mild benign rash that resolved on stopping carbamazepine, oxcarbazepine can be tried with close monitoring (or pre-treatment HLA-B*1502 testing in at-risk populations). If the previous reaction was Stevens-Johnson syndrome, TEN, DRESS or anaphylaxis, oxcarbazepine is contraindicated.

Why do certain ethnic groups need a genetic test before starting Lonax?

Patients of Han Chinese, Thai or Indonesian ancestry who carry the HLA-B*1502 allele have a sharply increased risk of Stevens-Johnson syndrome and toxic epidermal necrolysis on oxcarbazepine and carbamazepine. The FDA recommends pre-treatment HLA-B*1502 testing in these populations. The test is a one-off blood or buccal swab; HLA-B*1502-positive patients should generally avoid oxcarbazepine and carbamazepine.

Can Lonax affect my contraceptive pill?

At doses above 1,200 mg/day, yes. Oxcarbazepine induces CYP3A4 modestly and reduces ethinyloestradiol and levonorgestrel levels by approximately 50% at higher doses. Below 1,200 mg/day the effect is small. If you take more than 1,200 mg/day, use a pill containing at least 50 µg ethinyloestradiol, switch to a non-oestrogen method (depot or IUD), or add barrier backup. Progestogen-only pills are less reliable on oxcarbazepine.

Is Lonax safe in pregnancy?

Oxcarbazepine is FDA Pregnancy Category C. Registry data suggest a modest increase in major congenital malformations relative to baseline, less than valproate or topiramate. Like other anticonvulsants, it reduces folate — 5 mg/day folic acid is recommended pre-conception and through the first trimester. Specialist supervision is essential and dose may need adjustment as clearance increases in pregnancy. The decision to continue is a balance between seizure risk to mother and fetal exposure risk; do not stop abruptly without specialist input.

Will Lonax make me drowsy or affect my driving?

Drowsiness, dizziness, double vision and ataxia are common during the first 2–3 weeks of titration. Most patients accommodate within 4–6 weeks. Avoid driving during titration and after dose increases until you know how you respond. If double vision persists at the maintenance dose, dose reduction usually resolves it.

Can Lonax treat trigeminal neuralgia?

Yes — off-label but well-established. Trigeminal neuralgia responds to sodium-channel blockers; carbamazepine is the on-label first-line, but oxcarbazepine has comparable efficacy with better tolerability and is widely used as an alternative when carbamazepine is poorly tolerated. Typical doses are 600–1,800 mg/day in 2 divided doses.

Can I drink alcohol on Lonax?

Light, occasional alcohol is usually tolerated. Heavy drinking adds CNS depression, lowers seizure threshold and worsens hyponatraemia by promoting diuresis. Avoid binge drinking entirely.

How do I taper off Lonax safely?

Reduce by approximately 20–25% per week under your neurologist’s supervision — faster tapers risk rebound seizures and status epilepticus. Sudden discontinuation is reserved for serious adverse reactions (severe rash, DRESS, SJS, severe hyponatraemia).

Where is Lonax manufactured?

Lonax is supplied by a WHO-GMP-sertifisert produsent and is bioequivalent to originator-brand oxcarbazepine (Trileptal®, Novartis). Batch certificates of analysis are available on request.

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