Lennox–Gastaut Syndrome বা LGS কী?

Lennox–Gastaut Syndrome (LGS) হলো একটি severe developmental epileptic encephalopathy, যেখানে শিশুর একাধিক ধরনের seizure থাকে, EEG-তে slow spike-wave ≤2.5 Hz এবং sleep EEG-তে generalized paroxysmal fast activity দেখা যায়, এবং ধীরে ধীরে cognitive/behavioral impairment বা developmental regression হতে পারে। সাধারণত onset হয় ৩–৫ বছর বয়সে, তবে diagnostic age range সাধারণত childhood/adolescence পর্যন্ত ধরা হয়।

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1. Etiology / Cause

LGS-এর কারণ দুইভাবে দেখা হয়:

A. Structural / acquired cause — common

• Hypoxic-ischemic brain injury / birth asphyxia
• CNS infection: meningitis, encephalitis
• Cortical malformation / brain maldevelopment
• Tuberous sclerosis complex
• Brain tumor
• Head trauma
• Previous infantile spasms / West syndrome — প্রায় ২০–২৫% ক্ষেত্রে history থাকতে পারে
• Metabolic disorder

B. Genetic / unknown cause

• অনেক ক্ষেত্রে clear cause পাওয়া যায় না।
• Reported genes: SCN1A, GABRB3, ALG13, CHD2 ইত্যাদি।

Pathophysiology: immature developing brain-এ cortical–subcortical network dysfunction, especially bilateral synchronized epileptic network activity, LGS-এর seizure ও EEG pattern তৈরি করে।

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2. Clinical Features / Symptoms

LGS-এর classic triad:

1. Multiple seizure types
   • Tonic seizure — especially sleep থেকে, LGS-এর জন্য খুব গুরুত্বপূর্ণ
   • Atonic seizure / drop attack — হঠাৎ পড়ে গিয়ে injury
   • Atypical absence seizure
   • Myoclonic seizure
   • Generalized tonic-clonic seizure
   • Focal impaired awareness seizure
   • Non-convulsive status epilepticus
2. Developmental delay / cognitive impairment
   • Speech delay
   • Learning difficulty
   • Regression
   • Intellectual disability: mild থেকে severe হতে পারে
3. Behavioral problem
   • Hyperactivity
   • Aggression
   • Autistic features
   • Sleep disturbance

Real clinical example: ৪ বছর বয়সী শিশু দিনে বহুবার হঠাৎ পড়ে যায়, রাতে হাত-পা শক্ত হয়ে যায়, স্কুল/ভাষা development পিছিয়ে যাচ্ছে, EEG-তে slow spike-wave ≤2.5 Hz এবং sleep EEG-তে generalized fast activity—এটি LGS strongly suggest করে।

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3. Clinical Diagnosis — Specific Criteria

LGS diagnosis clinical history + EEG দিয়ে করা হয়। ILAE অনুযায়ী mandatory features:

• Tonic seizure present
• অন্তত আরও একটি seizure type: atypical absence / atonic / myoclonic / GTC / focal impaired awareness / epileptic spasms / non-convulsive status
• EEG: generalized slow spike-wave ≤2.5 Hz
• Sleep EEG: generalized paroxysmal fast activity
• Onset usually childhood; diagnostic upper limit generally ≤18 years
• Treatment-resistant epilepsy
• Developmental/cognitive impairment commonly present

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4. Investigations — Specific

A. EEG — most important

• Routine EEG
• Sleep EEG: কারণ GPFA sleep-এ বেশি দেখা যায়
• Video-EEG monitoring: seizure type confirm করার জন্য
• Findings:
  • Generalized slow spike-wave ≤2.5 Hz
  • Generalized paroxysmal fast activity 10–30 Hz during sleep

B. Neuroimaging

• MRI brain epilepsy protocol
  • cortical dysplasia
  • hypoxic injury
  • tumor
  • tuberous sclerosis
  • malformation detect করার জন্য

C. Laboratory / metabolic workup — selected cases

• CBC, electrolytes, glucose, calcium, magnesium
• LFT, RFT
• Serum ammonia, lactate
• Plasma amino acid, acylcarnitine profile
• Urine organic acid
• Toxicology screen if suspected
• Lumbar puncture if infection suspected, but raised ICP/space occupying lesion exclude করার পর

D. Genetic tests

• Epilepsy gene panel
• Chromosomal microarray
• Whole exome sequencing if unclear etiology

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5. Differential Diagnosis

• Dravet syndrome
• West syndrome / infantile spasms
• Epilepsy with myoclonic-atonic seizures / Doose syndrome
• Developmental epileptic encephalopathy with spike-wave activation in sleep
• Frontal lobe epilepsy
• Ring chromosome 20 syndrome
• Progressive myoclonic epilepsy
• Neuronal ceroid lipofuscinosis
• Metabolic / neurodegenerative disease

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6. Treatment Management

Core treatment goal

LGS সাধারণত lifelong এবং drug-resistant। লক্ষ্য হলো seizure frequency কমানো, drop attack injury prevention, development/behavior support, এবং quality of life improve করা। NICE guideline অনুযায়ী specialist paediatric/adult neurologist with epilepsy expertise involve করা উচিত।

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Pharmacological Treatment — Generic drug, dose, duration, side effect, interaction

Dose সবসময় বয়স, ওজন, liver/renal function, pregnancy risk, concomitant drug এবং serum level অনুযায়ী specialist adjust করবেন। Anti-seizure medicine কখনো হঠাৎ বন্ধ করা যাবে না।

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1. Sodium valproate / Valproic acid / Divalproex sodium

কেন ব্যবহার হয়: LGS-এর multiple generalized seizure type—tonic, atonic, atypical absence, GTC—এর জন্য broad-spectrum first-line drug। NICE LGS-এ first-line হিসেবে sodium valproate recommend করে, তবে pregnancy safety restriction অবশ্যই মানতে হবে।

Brand name	Common form/strength	Company
Valoate / Valoate CR	Syrup 200 mg/5 ml; CR tab 200/300/500 mg	Square
Valex / Valex CR	Tab 200 mg; Syrup 200 mg/5 ml; IV 500 mg/5 ml; CR 200/300/500 mg	Incepta
Epilim / Epilim Chrono	Syrup 200 mg/5 ml; Chrono 200/300/500 mg	Synovia/Sanofi lineage listing
Encorate / Encorate Chrono	Tab 200 mg; Chrono 200/300/500 mg	Sun Pharma Bangladesh
Valepsy / Valepsy CR	Syrup 200 mg/5 ml; CR 200/300/500 mg	Healthcare Pharma
Sodival CR	CR tab 200/300/500 mg	ACI
Proval / Proval CR	Syrup 200 mg/5 ml; CR 200/300/500 mg	General Pharma
Eval / Eval CR	Tab/syrup; CR 200/300/500 mg	UniMed UniHealth
Epival Chrono	Chrono/CR 200/300/500 mg	Albion
Convules CR	CR tab 200/300/500 mg	Opsonin
Nalipsy	Tab 200 mg	Drug International
Valepi	Tab 200 mg	Medimet

Dose

• Start: 10–15 mg/kg/day PO
• Increase: 5–10 mg/kg/week
• Usual therapeutic serum level: 50–100 mcg/mL
• Maximum: সাধারণত 60 mg/kg/day অতিক্রম করা হয় না।

Duration

• Fixed short course নয়; usually long-term।
• ভালো response হলে months–years continue।
• Stop করতে হলে slow taper; abrupt stop করলে status epilepticus হতে পারে।

Side effects

• Nausea, vomiting, abdominal pain
• Tremor, dizziness, somnolence
• Weight gain, increased appetite
• Hair loss
• Thrombocytopenia
• Hepatotoxicity
• Pancreatitis
• Hyperammonemia
• Major teratogenic risk

Important interactions

• Lamotrigine level বাড়ায় → rash/SJS risk; lamotrigine low-dose slow titration দরকার।
• Rufinamide level বাড়ায় → rufinamide lower starting dose দরকার।
• Cannabidiol + valproate → liver enzyme elevation risk বেশি।
• Alcohol/CNS depressant → sedation বাড়ে।

Avoid / caution

• Liver disease
• Urea cycle disorder
• Mitochondrial disorder / POLG-related disease
• Female of childbearing potential: strict pregnancy prevention counselling

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2. Lamotrigine:-

Brand name	Strength / form	Company
Lameptil	25 mg, 50 mg tablet	SANDOZ/Novartis
Lamicet	50 mg tablet	Square
Lamitrin	25 mg, 50 mg tablet; 2 mg, 5 mg dispersible tab	ACI
Lamitrin ER	50 mg, 100 mg extended-release tab	ACI
Lamo	25 mg, 50 mg tablet	Opsonin
Lamogin	25 mg, 50 mg tablet; 2 mg, 5 mg dispersible tab	Incepta
Lamopil	25 mg, 50 mg tablet	Sun Pharma Bangladesh

কেন ব্যবহার হয়: Valproate inadequate হলে second-line monotherapy বা add-on হিসেবে ব্যবহার হয়। Drop attack ও generalized seizure কমাতে evidence আছে। NICE LGS-এ second-line হিসেবে lamotrigine দেয়, তবে কিছু রোগীর seizure worsen করতে পারে—monitor করতে হবে।

Dose — slow titration essential

• With valproate adult:
  • 25 mg alternate day × 2 weeks
  • 25 mg daily × 2 weeks
  • তারপর 25–50 mg/day করে প্রতি 1–2 সপ্তাহে increase
  • Maintenance: 100–200 mg/day
• Children 2–12 years:
  • Valproate থাকলে low-dose regimen; typical maintenance 1–5 mg/kg/day, max 200 mg/day
  • Enzyme inducer থাকলে dose বেশি লাগতে পারে।

Duration

• Long-term add-on/monotherapy।
• Rash, fever, mucosal lesion হলে immediately stop/evaluate।

Side effects

• Rash, Stevens–Johnson syndrome, TEN
• DRESS
• Dizziness, diplopia, ataxia
• Nausea, vomiting
• Somnolence
• Headache
• Rare: HLH, aseptic meningitis

Interactions

• Valproate increases lamotrigine level → dose কম, titration slow।
• Carbamazepine, phenytoin, phenobarbital, primidone, rifampicin → lamotrigine level কমায়।
• Estrogen-containing OCP lamotrigine level কমাতে পারে; pill-free week-এ level বাড়তে পারে।

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3. Clobazam

কেন ব্যবহার হয়: Add-on benzodiazepine; LGS-এর drop attack, tonic/atonic seizure এবং seizure clusters কমাতে ব্যবহৃত হয়।

Brand name	Generic	Strength	Company
Clob	Clobazam	10 mg tablet	Opsonin
Clobam 10	Clobazam	10 mg tablet	Square
Frisium 10	Clobazam	10 mg tablet	Synovia/Sanofi
Cosium	Clobazam	10 mg tablet	ACME
Keolax	Clobazam	10 mg tablet	Beximco
Calm 10	Clobazam	10 mg tablet	Biopharma
Clozam	Clobazam	10 mg tablet	Navana
Clobid	Clobazam	10 mg tablet	Medimet
Colax	Clobazam	10 mg tablet	Pharmadesh
Ebazam	Clobazam	10 mg tablet	Edruc
Nebium	Clobazam	10 mg tablet	Globe
Noanxit 10	Clobazam	10 mg tablet	Rephco
Tensnil	Clobazam	10 mg tablet	Alco
Tranquil 10	Clobazam	10 mg tablet	Ibn Sina
Venium	Clobazam	10 mg tablet	Hudson

Dose

• ≤30 kg:
  • Start 5 mg/day
  • Day 7: 10 mg/day
  • Day 14: 20 mg/day
• 30 kg:
  • Start 10 mg/day
  • Day 7: 20 mg/day
  • Day 14: 40 mg/day
• 5 mg/day হলে usually divided BID।

Duration

• Long-term add-on হতে পারে, কিন্তু tolerance/dependence monitor করতে হবে।
• Stop করলে 5–10 mg/week taper।

Side effects

• Somnolence, sedation
• Drooling
• Ataxia
• Aggression/behavior change
• Respiratory depression, especially opioid/CNS depressant এর সাথে
• Dependence, withdrawal seizure
• Rash/DRESS rare

Interactions

• Opioid + clobazam → severe respiratory depression/coma/death risk।
• Alcohol/CNS depressant → sedation বাড়ে।
• Cannabidiol → N-desmethylclobazam বাড়ায়, sedation বাড়তে পারে।
• CYP2C19 inhibitor যেমন omeprazole/fluconazole/fluvoxamine → active metabolite বাড়ায়।
• Hormonal contraceptive efficacy কমাতে পারে।

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4. Rufinamide Not available in Bd.

কেন ব্যবহার হয়: LGS-এর adjunctive therapy; especially drop attack / atonic / tonic seizure কমাতে ব্যবহৃত হয়। Sodium channel inactive state prolong করে repetitive firing কমায়।

Dose

• Age 1–17 years:
  • Start 10 mg/kg/day, divided BID with food
  • Increase 10 mg/kg/day every other day
  • Max 45 mg/kg/day, not exceeding 3200 mg/day
• Adult:
  • Start 400–800 mg/day, divided BID
  • Increase 400–800 mg every other day
  • Max 3200 mg/day
• Valproate থাকলে lower starting dose দরকার।

Duration

• Long-term add-on।
• 4–8 সপ্তাহ seizure diary দেখে response assess।

Side effects

• Vomiting, nausea
• Somnolence, fatigue
• Dizziness
• Diplopia / blurred vision
• Ataxia
• Rash, rare SJS
• Leukopenia
• QT shortening

Interactions

• Valproate → rufinamide level বাড়ায়।
• Carbamazepine, phenytoin, phenobarbital → rufinamide level কমায়।
• Hormonal contraception efficacy কমাতে পারে; backup contraception দরকার।
• Contraindicated: familial short-QT syndrome।

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5. Topiramate

কেন ব্যবহার হয়: Broad-spectrum adjunctive drug; LGS-এর tonic/atonic/drop seizure কমাতে ব্যবহৃত হয়। NICE third-line add-on option হিসেবে রাখে।

Generic	Brand	Strength
Topiramate	Topimax	25 mg, 50 mg
Topiramate	Topirva	25 mg, 50 mg
Topiramate XR	Topirva XR	25 mg, 50 mg, 100 mg
Topiramate	Topmate	25 mg, 50 mg
Topiramate	Epimet	25 mg, 50 mg
Topiramate	Etopira	25 mg, 50 mg

Dose

• Adult:
  • Start 25–50 mg/day
  • Increase 25–50 mg/week
  • Maintenance 200–400 mg/day, divided BID
• Children 2–16 years:
  • Start 25 mg nightly বা 1–3 mg/kg/day
  • Increase 1–3 mg/kg/day every 1–2 weeks
  • Maintenance 5–9 mg/kg/day, divided BID

Duration

• Long-term add-on; cognition, weight, bicarbonate, renal stone risk monitor।

Side effects

• Cognitive slowing, word-finding difficulty
• Paresthesia
• Somnolence, dizziness, ataxia
• Weight loss, anorexia
• Metabolic acidosis
• Nephrolithiasis
• Oligohidrosis / heat intolerance
• Acute angle-closure glaucoma
• Mood change

Interactions

• Valproate + topiramate → hyperammonemic encephalopathy risk।
• Ketogenic diet / carbonic anhydrase inhibitor → metabolic acidosis ও renal stone risk বাড়ে।
• Higher dose topiramate hormonal contraceptive efficacy কমাতে পারে।
• Pregnancy risk আছে; women/girls of childbearing potential-এ strict caution।

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6. Cannabidiol, purified oral solution Not available in Bd.

কেন ব্যবহার হয়: Refractory LGS-এ add-on therapy, especially drop seizures কমাতে; NICE cannabidiol with clobazam option দিয়েছে specific criteria অনুযায়ী।

Dose

• Start 2.5 mg/kg BID = 5 mg/kg/day
• After 1 week: 5 mg/kg BID = 10 mg/kg/day
• If needed: weekly increase to 10 mg/kg BID
• Max 20 mg/kg/day
• Start করার আগে ALT, AST, bilirubin করতে হবে।

Duration

• Response ও liver enzyme দেখে continue।
• Usually 3–6 মাসে meaningful response না থাকলে reassess।

Side effects

• Somnolence
• Decreased appetite
• Diarrhea
• Transaminase elevation
• Fatigue
• Rash
• Insomnia / sleep disturbance
• Infection tendency

Interactions

• Clobazam → active metabolite বাড়ে, sedation বাড়ে।
• Valproate → ALT/AST elevation risk বেশি।
• Rifampicin / strong CYP inducer → cannabidiol level কমায়।
• Alcohol/CNS depressant → sedation বাড়ায়।
• CYP2C19 substrate drug affected হতে পারে।

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7. Fenfluramine Not available in Bd.

কেন ব্যবহার হয়: Refractory LGS-এ add-on therapy; drop seizure কমাতে ব্যবহৃত হয়। Cardiac valvular disease ও pulmonary arterial hypertension risk থাকায় strict monitoring দরকার।

Dose

• Start 0.1 mg/kg BID
• Day 7: 0.2 mg/kg BID
• Day 14: 0.35 mg/kg BID
• Maximum total daily dose: 26 mg/day
• Stiripentol + clobazam থাকলে max lower: 0.2 mg/kg BID, max 17 mg/day।

Monitoring

• Echocardiography before treatment
• Every 6 months during treatment
• Stop করার 3–6 months পর repeat echo

Side effects

• Diarrhea
• Decreased appetite, weight loss
• Fatigue
• Somnolence
• Vomiting
• Increased blood pressure
• Glaucoma risk
• Serotonin syndrome
• Valvular heart disease / pulmonary hypertension

Interactions

• MAOI-এর সাথে contraindicated; 14 দিনের washout দরকার।
• SSRI, SNRI, TCA, triptan, lithium, tramadol, dextromethorphan, St John’s wort → serotonin syndrome risk।
• Strong CYP1A2/CYP2D6 inhibitor dose adjustment দরকার।
• Strong enzyme inducer এ avoid/adjust।

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8. Felbamate — last resort Not Available in Bd.

কেন ব্যবহার হয়: Severe refractory LGS-এ, অন্য drug ব্যর্থ হলে specialist supervision-এ last-line option। Aplastic anemia ও hepatic failure-এর জন্য routine first-line নয়।

Dose

• Children 2–14 years:
  • Start 15 mg/kg/day, divided TID/QID
  • Increase 15 mg/kg/day weekly
  • Max 45 mg/kg/day
• Adult:
  • Start 1200 mg/day, divided TID/QID
  • Increase 1200 mg/day weekly
  • Max 3600 mg/day
• Existing AED dose প্রায় 20% reduce করতে হতে পারে।

Duration

• Only if clear benefit outweighs risk।
• CBC + LFT baseline এবং frequent monitoring আবশ্যক।

Side effects

• Aplastic anemia
• Acute liver failure
• Weight loss, anorexia
• Insomnia
• Headache
• Nausea, vomiting
• Fever, fatigue

Interactions

• Phenytoin, valproate, phenobarbital level বাড়াতে পারে।
• Carbamazepine level কমায় কিন্তু epoxide metabolite বাড়ায়।
• Carbamazepine/phenytoin/phenobarbital felbamate level কমাতে পারে।

Role in LGS	Generic name	Bangladesh available brand names	কেন ব্যবহার হয়
1st line	Sodium valproate / Valproic acid	Convules, Convules CR, Encorate, Encorate Chrono, Epilim, Epilim Chrono, Epival Chrono, Eval, Eval CR, Nalipsy, Proval, Proval CR, Sodival CR, Valepsy, Valepsy CR, Valex, Valex CR, Valoate, Valoate CR, Valporin, Valporin CR	Multiple seizure type: tonic, atonic/drop, atypical absence, GTC, myoclonic seizure control. NICE LGS-এ first-line হিসেবে sodium valproate recommend করে। (NICE)
2nd line / add-on	Lamotrigine	Lamitrin, Lamitrin ER, Lamo, Lamogin, Lamopil	Valproate inadequate হলে second-line monotherapy/add-on; generalized seizure burden কমাতে। তবে কিছু LGS রোগীতে seizure worsen করতে পারে, তাই monitoring দরকার। (NICE)
3rd line add-on	Clobazam	Calm, Clob, Clobid, Clozam, Colax, Cosium, Ebazam, Frisium, Keolax, Nebium, Noanxit, Tensnil, Tranquil, Venium	Add-on benzodiazepine; drop attack, tonic seizure, seizure cluster কমাতে। (NICE)
3rd line add-on	Topiramate	Epimet, Etopira, Topimax, Topirva, Topirva XR, Topmate	Broad-spectrum add-on; tonic/atonic/drop seizure ও GTC কমাতে। (NICE)
Rescue / prolonged seizure	Diazepam	Azepam, D-Pam, Diazimet, Easium, G-Diazepam, Pharmapam, Relaxen, Sedapen, Sedatab, Sedil, Seduxen, Seequil-S, Selium, Tensareal	Status epilepticus / prolonged seizure / febrile convulsion rescue; LGS maintenance drug নয়। (Medex)
Rescue / hospital use	Midazolam	Anquil, Benquil, Dormax, Dormicum, Dormitol, Hypnocum, Hypnofast, Midalam, Midazolam Hameln, Midolam, Midzo, Milam	Acute prolonged seizure/status epilepticus; IM/IV/buccal/intranasal protocol অনুযায়ী emergency control। (Medex)
Sometimes used in mixed epilepsy, not core LGS drug	Levetiracetam	Citazar, Citazar XR, Epicet XR, Erata, Leveron XR, Levetam	Myoclonic/GTC/partial seizure থাকলে selected add-on; LGS-specific first-line নয়। (Medex)
Not reliably found as Bangladesh routine brand in public directories	Rufinamide	Verified Bangladesh brand পাওয়া যায়নি	NICE LGS third-line add-on হিসেবে রাখে, especially drop attacks; Bangladesh-এ import/specialist access লাগতে পারে। (NICE)
Not reliably found as Bangladesh routine brand in public directories	Cannabidiol purified oral solution	Verified Bangladesh brand পাওয়া যায়নি; international brand: Epidiolex/Epidyolex	Refractory LGS-এ clobazam-এর সাথে add-on; liver enzyme monitoring দরকার। NICE specific criteria-তে ব্যবহার করে। (NICE)
Not reliably found as Bangladesh routine brand in public directories	Fenfluramine	Verified Bangladesh brand পাওয়া যায়নি; international brand: Fintepla	Refractory LGS add-on; echo monitoring লাগে because valvular disease/PAH risk। NICE 2025 update-এ third-line option। (NICE)
Last resort; not reliably found as Bangladesh routine brand	Felbamate	Verified Bangladesh brand পাওয়া যায়নি; international brand: Felbatol	Very refractory LGS; aplastic anemia/hepatic failure risk, তাই specialist-only last-line। NICE all other options fail করলে consider করতে বলে। (NICE)

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7. Drugs that may worsen LGS seizures

LGS-এ কিছু drug tonic/myoclonic/drop seizure worsen করতে পারে; তাই specialist ছাড়া avoid/very careful use:

• Carbamazepine
• Oxcarbazepine
• Gabapentin
• Pregabalin
• Tiagabine
• Vigabatrin
• Lacosamide
• Phenobarbital
• Lamotrigine—যদিও second-line option, কিছু রোগীতে worsening হতে পারে, তাই close monitoring দরকার।

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8. Non-pharmacological Management

• Ketogenic diet: third-line drugs fail করলে specialist dietitian supervision-এ consider।
• Helmet / fall protection: drop attack থাকলে
• Vagus nerve stimulation: refractory case
• Corpus callosotomy: severe drop attacks with injury
• Epilepsy surgery: focal structural lesion থাকলে selected case
• Developmental therapy: speech therapy, occupational therapy, physiotherapy
• Behavioral and sleep management
• School safety plan

Point-wise Pharmacological Dose + Purpose + Side effect + Interaction

1) Sodium valproate / Valproic acid

BD brands: Epilim/Epilim Chrono, Valex/Valex CR, Valoate/Valoate CR, Convules CR, Proval CR, Valepsy CR, Valporin CR, Encorate Chrono.

• Use: LGS first-line; tonic, atonic/drop, atypical absence, myoclonic, GTC seizure.
• Dose: start 10–15 mg/kg/day PO, weekly increase 5–10 mg/kg/day; usual max 60 mg/kg/day.
• Duration: long-term; seizure-free/controlled হলে years; abrupt stop করা যাবে না।
• Side effects: weight gain, tremor, hair loss, GI upset, thrombocytopenia, hepatotoxicity, pancreatitis, hyperammonemia, teratogenicity.
• Interaction: lamotrigine level ↑ → rash/SJS risk; cannabidiol + valproate → ALT/AST ↑; topiramate + valproate → hyperammonemia risk.

2) Lamotrigine

BD brands: Lamitrin, Lamitrin ER, Lamo, Lamogin, Lamopil.

• Use: Valproate failure/intolerance হলে second-line; generalized seizure reduction.
• Dose: very slow titration. Valproate-এর সাথে থাকলে lower dose: adult often 25 mg alternate day × 2 weeks, then 25 mg daily × 2 weeks, then gradual increase.
• Duration: long-term if effective.
• Side effects: rash, SJS/TEN, dizziness, diplopia, ataxia, headache, nausea.
• Interaction: valproate lamotrigine level ↑; carbamazepine/phenytoin/phenobarbital/rifampicin level ↓; estrogen OCP level ↓.

3) Clobazam

BD brands: Frisium, Clob, Calm, Clozam, Cosium, Keolax, Tranquil, Venium, etc.

• Use: LGS drop attack/seizure cluster; add-on.
• Dose:
  • ≤30 kg: start 5 mg/day, then 10 mg/day, max about 20 mg/day.
  • 30 kg: start 10 mg/day, then 20 mg/day, max about 40 mg/day.
• Duration: long-term possible, but tolerance/dependence monitor; taper slowly.
• Side effects: sedation, drooling, ataxia, aggression/irritability, respiratory depression, dependence, withdrawal seizure.
• Interaction: opioid/alcohol/CNS depressant → respiratory depression; cannabidiol → active metabolite ↑ → sedation; fluconazole/fluvoxamine/omeprazole → clobazam effect ↑.

4) Topiramate

BD brands: Topirva, Topirva XR, Topimax, Topmate, Epimet, Etopira.

• Use: third-line add-on; tonic/atonic/drop seizure and GTC.
• Dose: children usually start 1–3 mg/kg/day, increase gradually; maintenance often 5–9 mg/kg/day divided BID. Adult start 25–50 mg/day, increase weekly.
• Duration: long-term if effective.
• Side effects: cognitive slowing, speech difficulty, paresthesia, weight loss, metabolic acidosis, renal stone, oligohidrosis/heat intolerance, glaucoma.
• Interaction: valproate → hyperammonemia; carbonic anhydrase inhibitor/ketogenic diet → acidosis/stone risk; high dose may reduce hormonal contraceptive efficacy.

5) Diazepam — Rescue

BD brands: Sedil, Seduxen, Easium, G-Diazepam, Azepam, D-Pam, Diazimet.

• Use: seizure >5 min, cluster seizure, status epilepticus rescue.
• Dose: hospital/emergency protocol অনুযায়ী; IV/rectal/suppository formulation অনুযায়ী dose আলাদা।
• Duration: maintenance নয়; acute use only.
• Side effects: respiratory depression, hypotension, sedation, aspiration risk.
• Interaction: opioid, alcohol, sedative antihistamine, antipsychotic, other benzodiazepine → respiratory depression.

6) Midazolam — Rescue / Hospital

BD brands: Midolam, Hypnofast, Dormitol, Dormax, Anquil, Midzo, Milam.

• Use: status epilepticus/prolonged seizure; IM/IV/buccal/intranasal route.
• Dose: protocol-based; paediatric dose usually weight-based.
• Duration: acute rescue only.
• Side effects: respiratory depression, hypotension, excessive sedation.
• Interaction: opioid/CNS depressant ↑; CYP3A4 inhibitors such as clarithromycin, azole antifungal may increase effect.

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Clinically Important Note

LGS treatment specialist-based হওয়া উচিত। NICE স্পষ্টভাবে বলে LGS রোগীর care-এ adult/paediatric neurologist with epilepsy expertise থাকা দরকার। Valproate first-line, lamotrigine second-line, এরপর cannabidiol with clobazam, clobazam, fenfluramine, rufinamide, topiramate third-line add-on হিসেবে consider করা হয়।

Overview / Summary

বাংলাদেশে LGS-এর জন্য practical available drugs হলো sodium valproate, lamotrigine, clobazam, topiramate, আর emergency rescue হিসেবে diazepam/midazolam। Rufinamide, cannabidiol, fenfluramine, felbamate আন্তর্জাতিক guideline-এ আছে, কিন্তু Bangladesh public medicine directories-এ routine verified brand পাওয়া যায়নি; specialist/import access লাগতে পারে।

Actionable Plan / Steps

1. First-line: sodium valproate, contraindication না থাকলে।
2. Inadequate response: lamotrigine add-on/alternative.
3. Drop attack বেশি হলে: clobazam ± topiramate consider.
4. Refractory হলে: tertiary epilepsy center → ketogenic diet, VNS/corpus callosotomy, imported rufinamide/cannabidiol/fenfluramine consideration.
5. Seizure action plan: diazepam/midazolam rescue protocol লিখে caregiver training দিন।
6. CBC, LFT, RFT, weight, cognition, seizure diary, drug adverse effect regular monitor করুন।

Reference List

1. NICE NG217. Epilepsies in children, young people and adults, LGS section, updated 2025.
2. MedEx Bangladesh medicine index: Sodium valproate, lamotrigine, clobazam, topiramate, diazepam, midazolam brand listings.
3. Motte J, et al. Lamotrigine for LGS. NEJM. DOI: 10.1056/NEJM199712183372504
4. Ng YT, et al. Clobazam in LGS. Neurology. DOI: 10.1212/WNL.0b013e318232de76
5. Sachdeo RC, et al. Topiramate in LGS. Neurology. DOI: 10.1212/WNL.52.9.1882
6. Devinsky O, et al. Cannabidiol in LGS. NEJM. DOI: 10.1056/NEJMoa1714631
7. Knupp KG, et al. Fenfluramine in LGS. JAMA Neurology. DOI: 10.1001/jamaneurol.2022.0829

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9. Prevention

LGS সবসময় prevent করা যায় না, কারণ genetic/structural cause থাকতে পারে। কিন্তু secondary causes কমানো যায়।

Primary prevention

• Good antenatal ও perinatal care: birth asphyxia/hypoxic injury কমানো
• Neonatal seizure, hypoglycemia, jaundice দ্রুত treat
• CNS infection prevention: vaccination, hygiene, meningitis/encephalitis early treatment
• Head injury prevention: helmet, road safety
• Neurocysticercosis/parasite prevention in endemic area
• Tuberous sclerosis/family history থাকলে genetic counselling

Secondary prevention

• Seizure diary maintain
• Medicine adherence
• Sleep deprivation avoid
• Fever/infection early treat
• Swimming/bathing supervision
• Drop attack থাকলে helmet
• Written seizure action plan
• Seizure >5 min, repeated seizure, breathing problem, water-related seizure, injury হলে emergency care নিতে হবে।

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Overview / Summary

LGS হলো severe childhood-onset epileptic encephalopathy, যেখানে tonic seizure, multiple seizure types, developmental impairment এবং characteristic EEG pattern থাকে। Diagnosis mainly clinical + EEG; sleep EEG অত্যন্ত গুরুত্বপূর্ণ। Treatment long-term, usually combination therapy লাগে। Valproate first-line; lamotrigine second-line; add-on হিসেবে clobazam, rufinamide, topiramate, cannabidiol, fenfluramine ব্যবহার হয়; felbamate last resort।

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Actionable Plan / Steps

1. Suspected LGS হলে paediatric neurologist/epileptologist refer করুন।
2. Seizure semiology লিখুন: tonic, atonic/drop, atypical absence, GTC, NCSE আছে কি না।
3. Video EEG + sleep EEG করুন।
4. MRI brain epilepsy protocol করুন।
5. Cause unclear হলে metabolic + genetic workup করুন।
6. Injury risk থাকলে helmet, bathing/swimming supervision, school seizure plan দিন।
7. Drug start করার আগে baseline CBC, LFT, RFT, electrolytes; valproate/CBD/felbamate/fenfluramine অনুযায়ী specific monitoring করুন।
8. Seizure diary দিয়ে 4–12 সপ্তাহ interval-এ response ও adverse effect review করুন।
9. Drug abruptly stop করবেন না; taper specialist supervision-এ।

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Reference List

Textbook

1. Harrison’s Principles of Internal Medicine, 21st ed. McGraw-Hill; Chapter: Seizures and Epilepsy.
2. Davidson’s Principles and Practice of Medicine, 24th ed. Elsevier; Neurology/Epilepsy section.
3. Nelson Textbook of Pediatrics, 22nd ed. Elsevier; Childhood epilepsy and epileptic encephalopathies.
4. Bradley and Daroff’s Neurology in Clinical Practice, 8th ed. Elsevier; Epilepsy syndromes.

Guideline / Official source

1. NICE Guideline NG217: Epilepsies in children, young people and adults, updated 2025.
2. ILAE EpilepsyDiagnosis.org: Lennox–Gastaut syndrome diagnostic criteria.
3. WHO Epilepsy fact sheet / prevention guidance.
4. CDC Seizure First Aid guidance.

Peer-reviewed DOI

1. Motte J, et al. Lamotrigine for generalized seizures associated with Lennox–Gastaut syndrome. N Engl J Med. 1997;337:1807–1812. DOI: 10.1056/NEJM199712183372504
2. Glauser T, et al. Rufinamide for generalized seizures associated with Lennox–Gastaut syndrome. Neurology. 2008;70:1950–1958. DOI: 10.1212/01.wnl.0000303813.95800.0d
3. Ng YT, et al. Randomized trial of clobazam in Lennox–Gastaut syndrome. Neurology. 2011;77:1473–1481. DOI: 10.1212/WNL.0b013e318232de76
4. Devinsky O, et al. Cannabidiol in patients with Lennox–Gastaut syndrome. N Engl J Med. 2018;378:1888–1897. DOI: 10.1056/NEJMoa1714631
5. Sachdeo RC, et al. Topiramate in Lennox–Gastaut syndrome. Neurology. 1999;52:1882–1887. DOI: 10.1212/WNL.52.9.1882
6. Felbamate Study Group. Felbamate in Lennox–Gastaut syndrome. N Engl J Med. 1993;328:29–33. DOI: 10.1056/NEJM199301073280104
7. Knupp KG, et al. Fenfluramine for Lennox–Gastaut syndrome. JAMA Neurology. 2022;79:554–564. DOI: 10.1001/jamaneurol.2022.0829

Md.Rafiqul Islam Lipu,Date:-21-05-2026 Thursday,Time:-10-27-49 Pm