Clobazam

# Clobazam ## Overview - **Classification**: Benzodiazepine, Anticonvulsant (C-IV controlled substance) - **Mechanism**: Potentiates the effect of GABA by binding to GABA-A receptors, increasing chloride ion influx and neuronal hyperpolarization, thus reducing neuronal excitability. ## Primary Indications 1. **Lennox-Gastaut Syndrome (LGS)** - Adjunctive treatment for seizures associated with LGS. 2. **Anxiety** - Short-term symptomatic relief of anxiety (historical, less common primary use now). ## Adult Dosing ### Standard Dosing **Adjunctive treatment of seizures associated with Lennox-Gastaut Syndrome (LGS)** - **Initial Dose**: **5 mg** PO BID, OR **10 mg** PO once daily at bedtime. - **Titration**: Increase by **5-10 mg/day** weekly, as tolerated. - **Frequency**: Once or twice daily. - **Route**: Oral. - **Maximum Dose**: **80 mg/day**. ### Dose Adjustments - **Renal Impairment**: Use with caution. Consider lower starting dose **5 mg** PO daily. - **Hepatic Impairment**: Start at **5 mg** PO once daily. Titrate slowly. Max **30 mg/day**. - **Elderly Patients**: Start at **5 mg** PO once daily. Titrate slowly. Max **30 mg/day** due to increased sensitivity to adverse effects. ## Pediatric Dosing ### Neonates (0-28 days) - **Dose**: Not recommended. - **Special Notes**: Limited data; high risk of sedation and respiratory depression. Consult specialist if considered. ### Infants (1-12 months) - **Dose**: Not specifically recommended for LGS in this age group. - **Special Notes**: Use with extreme caution under specialist guidance only. Risk of profound sedation. ### Children (1-12 years) **Adjunctive treatment of seizures associated with Lennox-Gastaut Syndrome (LGS)** - **Weight <30 kg**: - **Initial Dose**: **5 mg** PO once daily at bedtime. - **Titration**: Increase to **5 mg** PO BID after 7 days. - **Maximum Dose**: **20 mg/day** (or **0.8 mg/kg/day**). - **Weight ≥30 kg**: - **Initial Dose**: **5 mg** PO BID, OR **10 mg** PO once daily at bedtime. - **Titration**: Increase by **5-10 mg/day** weekly. - **Maximum Dose**: **40 mg/day**. - **Frequency**: Once or twice daily. - **Route**: Oral. - **Special Notes**: Oral suspension available (**2.5 mg/mL**) for precise dosing or difficulty swallowing. Monitor closely for sedation. ### Adolescents (13-18 years) **Adjunctive treatment of seizures associated with Lennox-Gastaut Syndrome (LGS)** - **Initial Dose**: **5 mg** PO BID, OR **10 mg** PO once daily at bedtime. - **Titration**: Increase by **5-10 mg/day** weekly. - **Frequency**: Once or twice daily. - **Route**: Oral. - **Maximum Dose**: **80 mg/day** (follow adult dosing). ## Safety Information ### Contraindications - **Absolute**: Hypersensitivity to clobazam or other benzodiazepines. - **Absolute**: Severe respiratory insufficiency, sleep apnea syndrome. - **Absolute**: Severe hepatic insufficiency. - **Absolute**: Myasthenia gravis. - **Absolute**: Alcohol or drug intoxication. ### Common Adverse Effects - **Very Common (>10%)**: Somnolence, sedation, lethargy, fatigue, drooling, aggression, ataxia, fever. - **Common (1-10%)**: Constipation, cough, insomnia, irritability, pneumonia, rash, tremor, slurred speech. - **Serious but Rare**: Suicidal ideation, respiratory depression, severe cutaneous adverse reactions (SJS, TEN, DRESS). ### Key Drug Interactions - **Opioids, other CNS Depressants (alcohol, sedatives)**: Greatly increased risk of profound sedation, respiratory depression, coma, death. Avoid concomitant use. - **CYP2C19 Inhibitors (e.g., fluvoxamine, fluoxetine, omeprazole)**: Increased clobazam exposure. Consider clobazam dose reduction. - **CYP2D6 Substrates (e.g., dextromethorphan, fluoxetine)**: Clobazam is a weak CYP2D6 inhibitor; may increase levels of substrates. - **Valproate**: May increase clobazam levels; consider clobazam dose reduction. ## Monitoring & Follow-up - **Before Treatment**: Assess for respiratory, hepatic impairment. Evaluate for history of substance abuse or suicidal ideation. - **During Treatment**: Monitor for CNS depression (sedation, ataxia), respiratory status, suicidal ideation. - **Clinical Signs**: Changes in seizure control, unusual behavior, signs of withdrawal (if tapered too quickly), skin reactions. ## Clinical Pearls - 💡 **Tip 1**: Administer once daily at bedtime to minimize daytime sedation, or divide doses to improve tolerability. - 💡 **Tip 2**: Do not discontinue abruptly; taper gradually over weeks to prevent withdrawal seizures or status epilepticus. - 💡 **Tip 3**: Counsel patients/caregivers on CNS depressant effects, avoiding alcohol, and safe use of machinery. - 💡 **Tip 4**: Patients taking clobazam may develop tolerance to the anxiolytic/sedative effects, but often not to the anticonvulsant effects. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.