Encorate Chrono
Encorate Chrono is sodium valproate 200 / 300 / 400 / 500 / 600 mg extended-release (chrono / CR) tablets from Sun Pharma — once-daily dosing with smoother plasma levels than immediate-release Encorate. For migraine prevention: start 500 mg nightly, titrate to 1,000 mg nightly (range 500-1,500 mg). Same pregnancy and monitoring restrictions as all valproate products.
✓ Verificat medical de Morgan Ellis — Cercetător farmaceutic · 8 ani de experiență · Ultima recenzie: mai 2026
⚡ Quick Answer — What is Encorate Chrono?
Encorate Chrono este un 200 / 300 / 400 / 500 / 600 mg sodium valproate / valproic acid extended-release (chrono / CR) tablet from Sun Pharma — an antiepileptic / mood-stabiliser / migraine preventive. In migraine prevention it is used at 500-1,500 mg once daily as a third- or fourth-line preventive after propranolol, topiramate, and amitriptyline. Absolute contraindication in pregnancy and in women of childbearing potential without pregnancy-prevention programme — valproate causes a 10% risk of major congenital malformations (neural tube defects, craniofacial, cardiac, limb, urogenital) and a 30-40% risk of neurodevelopmental impairment (reduced IQ 7-10 points, autism spectrum). The EMA and MHRA have issued progressively stricter prescribing restrictions since 2014. Other important side effects: hepatotoxicity (idiosyncratic; serious rarely fatal), pancreatitis, thrombocytopenia, hyperammonaemia, weight gain, hair loss, tremor, and polycystic ovarian syndrome in women.
What Is Encorate Chrono?
Encorate Chrono is an oral extended-release (chrono / CR) tablet of sodium valproate / valproic acid 200 / 300 / 400 / 500 / 600 mg from Sun Pharma, supplied in 30-180 tablet packs. Valproate is a branched short-chain fatty acid originally used as a solvent in pharmaceutical chemistry, later serendipitously discovered to have antiepileptic activity. It has been a first-line anticonvulsant for generalised and partial epilepsy since the 1970s and became the third drug with US FDA approval for migraine prophylaxis in 1996 (after propranolol and timolol).
Numele Chrono / CR extended-release formulation allows once-daily dosing with smoother plasma levels than the immediate-release formulation — better tolerability (less peak-related nausea and tremor) and better adherence.
How Valproate Prevents Migraine
Valproate works through multiple mechanisms relevant to migraine:
- GABAergic potentiation — increases GABA synthesis and reduces its degradation, enhancing inhibitory tone in the trigeminal nucleus caudalis and cortex
- Suppression of cortical spreading depression — the pathological wave that underlies migraine aura
- Voltage-gated sodium-channel blockade — reduces neuronal hyperexcitability
- Inhibition of NMDA-glutamate transmission
In migraine-prevention trials (Jensen 1994, Mathew 1995, Klapper 1997), valproate 500-1,500 mg/day reduced monthly migraine frequency by ~50% in about half of treated patients.
Approved Uses
- Migraine prophylaxis in adults — FDA-approved 1996
- Generalised epilepsy — absence, myoclonic, tonic-clonic seizures (first-line)
- Focal epilepsy (partial seizures) — alternative to carbamazepine
- Bipolar disorder — acute mania and maintenance
- Status epilepticus (IV formulation)
Encorate Chrono Dosage for Migraine Prevention
Valproate is titrated upward over 2-4 weeks to minimise nausea:
- Week 1: 500 mg once daily with evening meal
- Week 2: 750 mg once daily
- Week 3+: 1,000 mg once daily (target; adjust 500-1,500 mg based on response and tolerance)
- Assess benefit at 8-12 weeks. Keep a migraine diary to quantify change.
- Therapeutic plasma levels are 50-100 μg/mL for seizure control; for migraine, levels are not routinely needed — dose by clinical response.
Monitorizare:
- Baseline: LFTs (AST, ALT, bilirubin), FBC (platelet count), amylase, pregnancy test (women of childbearing potential), ammonia level (baseline)
- Month 1, 3, 6, then 6-monthly: LFTs, FBC
- Ammonia check if confusion or new cognitive symptoms
Discontinuation: taper over 2-4 weeks if stopping. In patients with co-existing epilepsy, never stop valproate without neurology input (seizure risk).
Efecte Secundare
Very common (>10%): nausea, dyspepsia, drowsiness, tremor, weight gain, hair thinning / hair loss, alopecia (usually transient; hair regrows after dose reduction or stopping).
Common (1-10%): ataxia, dizziness, headache, transient elevation of LFTs, thrombocytopenia (usually mild and dose-related), amenorrhoea or irregular menses, polycystic ovarian syndrome (in younger women), decreased libido, peripheral oedema.
Uncommon but serious:
- Hepatotoxicity — idiosyncratic; typically in first 6 months; risk higher in children under 2, in patients with mitochondrial disorders (POLG mutations are an absolute contraindication), and in polytherapy. Presents as nausea, vomiting, fatigue, jaundice. Requires urgent LFT + discontinuation.
- Pancreatitis — rare but potentially fatal; presents with abdominal pain, nausea, vomiting, raised lipase
- Hyperammonaemic encephalopathy — can occur with normal LFTs; presents as confusion, lethargy, new cognitive symptoms
- Thrombocytopenia, leukopenia — dose-related; severe forms rare
- Stevens-Johnson syndrome / TEN — rare; stop immediately and seek urgent care
Contraindicații
- Pregnancy (absolute) and women of childbearing potential without pregnancy-prevention programme
- Known or suspected POLG mitochondrial disorder (and children under 2 where POLG cannot be excluded) — risk of fatal hepatotoxicity
- Severe hepatic impairment or family history of severe hepatic dysfunction
- Acute porphyria
- Pancreatitis (personal history)
- Urea cycle disorders
- Hypersensitivity to valproate
Breastfeeding: valproate passes into milk in low amounts (milk/plasma ratio ~0.02). Generally considered acceptable during breastfeeding if the drug is needed; monitor the infant for unusual lethargy or poor feeding.
Interacțiuni medicamentoase
- Lamotrigine — valproate doubles lamotrigine levels; dose lamotrigine at half the usual starting dose
- Carbapenem antibiotics (meropenem, imipenem, ertapenem) — dramatically reduce valproate levels — seizure risk in epilepsy; avoid combination
- Warfarin — valproate displaces warfarin from albumin; monitor INR
- Aspirin — displaces valproate from albumin; raises free valproate concentration
- Phenytoin, carbamazepine — reduce valproate levels via CYP induction
- Other CNS depressants (benzodiazepines, alcohol, opioids) — additive sedation
Depozitare
Store below 25°C in original blister. Protect from moisture. Keep out of reach of children.
Întrebări frecvente
How long until Encorate Chrono starts preventing migraines?
Allow 8-12 weeks at target dose for full effect. Keep a migraine diary recording days per month at baseline and at week 12. A clinically meaningful response is a 50% reduction in monthly migraine days.
Is Encorate Chrono safe if I am planning pregnancy?
No. Valproate is one of the most teratogenic drugs in clinical use (~10% malformation risk, 30-40% neurodevelopmental impairment risk). Women of childbearing potential should be switched to a safer preventive (propranolol is preferred in pregnancy) before conception. A 3-month washout is usually recommended before trying to conceive. Valproate should not be used in women planning or able to become pregnant without a formal pregnancy-prevention programme.
Why is the extended-release form different from Encorate IR?
Same molecule (sodium valproate / valproic acid), different release profile. Encorate Chrono is extended-release for once-daily dosing with smoother plasma levels. Better tolerability, better adherence. Encorate IR requires twice-daily dosing.
Will Encorate Chrono make me gain weight?
Yes — weight gain is one of the most common side effects (average 3-5 kg over 6-12 months, more in some). Mechanism includes increased appetite, possibly altered glucose metabolism. If weight gain is problematic, consider switching to topiramate (which causes weight loss) or propranolol (weight-neutral).
Why do I need blood tests on Encorate Chrono?
Valproate can cause hepatotoxicity, pancreatitis, thrombocytopenia, and hyperammonaemia. Baseline + periodic LFTs, full blood count, and clinical monitoring catch problems early. Therapeutic drug monitoring (levels 50-100 μg/mL) is not routinely needed for migraine prevention — dose by clinical response.
Can I drink alcohol on Encorate Chrono?
Avoid regular or heavy alcohol use. Alcohol is additive with valproate’s sedation and adds to hepatic stress. Occasional small amounts are not absolutely contraindicated but regular drinking raises the risk of hepatotoxicity. Alcohol is also a common migraine trigger; reducing intake often improves migraine independent of valproate.
Can I stop Encorate Chrono abruptly?
No — taper over 2-4 weeks. Abrupt discontinuation can trigger rebound migraine and, in patients with any seizure tendency, seizure.
Where can I buy Encorate Chrono online?
You can buy Encorate Chrono (sodium valproate 200 / 300 / 400 / 500 / 600 mg extended-release (chrono / CR) tablet, 30-180 tablet packs) from MedsBase with discreet packaging and worldwide shipping.
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| Concentrație | 200 mg, 300 mg, 400 mg, 500 mg, 600 mg |
|---|---|
| Cantitate | 30 Comprimat/e, 60 Comprimat/e, 90 Comprimat/e, 180 Comprimat/e |
Encorate Chrono
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