Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
BUTABARBITAL SODIUM vs BREVITAL SODIUM
Clinician-reviewed, head-to-head comparison of mechanism, dosing, pharmacokinetics, and safety profiles.
Last clinically reviewed: July 2026 · OpiCalc Medical Review Team
Depresses neuronal activity in the reticular activating system by enhancing GABA-A receptor-mediated chloride influx, increasing the duration of chloride channel opening and inhibiting excitatory neurotransmission at high doses.
Brevital sodium (methohexital) is a barbiturate that acts as a GABA-A receptor agonist, enhancing chloride ion influx and hyperpolarizing neurons, leading to rapid sedation and anesthesia.
Preoperative sedation,Daytime sedation,Insomnia (short-term treatment),Status epilepticus (adjunct),Withdrawal syndrome (off-label)
Induction and maintenance of general anesthesia,Adjunct to regional anesthesia,Short-duration surgical procedures
Sedative: 15-30 mg orally 3-4 times daily. Hypnotic: 50-100 mg orally at bedtime. Maximum single dose: 100 mg. Maximum daily dose: 300 mg. Route: oral, intramuscular, intravenous. For IM/IV: divide oral dose by 2.
Induction of anesthesia: 1-1.5 mg/kg IV bolus over 15 seconds; maintenance: 0.5-1 mg/kg IV bolus as needed or 50-150 mcg/kg/min IV infusion.
Terminal elimination half-life: 30-50 hours; accumulates with repeated dosing, prolonged in hepatic impairment
Terminal elimination half-life: 3–6 hours (mean ~4 hours); prolonged in hepatic impairment, obesity, or with repeated dosing due to redistribution.
Primarily hepatic via CYP2C9, CYP2C19, and CYP3A4; conjugated with glucuronic acid; excreted renally.
Hepatic metabolism primarily by CYP2C9 and CYP3A4 to inactive metabolites; less than 1% excreted unchanged in urine.
Renal: 50-70% as metabolites (hydroxylated and conjugated forms), 5-10% unchanged; fecal: minor (<5%)
Primarily hepatic biotransformation to inactive metabolites (mainly hydroxy-methohexital), with renal excretion of metabolites; less than 1% excreted unchanged in urine. Minor biliary/fecal elimination.
25-35%, primarily to albumin
Approximately 70–90% bound to albumin.
0.5-0.8 L/kg; distributes widely into tissues, crosses blood-brain barrier
Vd: 1.1–2.5 L/kg (mean ~1.5 L/kg). Larger Vd indicates extensive tissue distribution (highly lipophilic), leading to rapid redistribution and short duration after single bolus.
Oral: 80-100% (rapid absorption); IM: complete
IV: 100%. IM: Not well established; likely >90%. Rectal: Variable, ~50–70% due to first-pass metabolism and incomplete absorption.
Contraindicated in severe renal impairment (e GFR <30 m L/min). For e GFR 30-50 m L/min: reduce dose by 25% and monitor for CNS depression. e GFR >50 m L/min: no adjustment.
No dosage adjustment required for GFR ≥10 m L/min; for GFR <10 m L/min, reduce dose by 50%.
Contraindicated in Child-Pugh Class C. Child-Pugh A: reduce dose by 50%. Child-Pugh B: reduce dose by 75% or use alternative. Avoid in severe hepatic impairment.
Child-Pugh A: no adjustment; Child-Pugh B: reduce dose by 50%; Child-Pugh C: reduce dose by 75% or consider alternative.
Not recommended for children <6 years. For children 6-12 years: sedative 5-15 mg orally 3-4 times daily; hypnotic not typically used. For adolescents >12 years: adult dosing with caution. Maximum single dose: 30 mg. Weight-based: 2-3 mg/kg/day divided every 6-8 hours, not to exceed 100 mg/day.
Induction: 1-2 mg/kg IV; maintenance: 0.5-1 mg/kg IV bolus or 50-150 mcg/kg/min IV infusion. Contraindicated in infants <2 months with stable BSA.
Start with lowest effective dose (e.g., 15 mg orally for sedation). Maximum dose: 50 mg per dose. Caution due to increased sensitivity, risk of falls, and cognitive impairment. Avoid hypnotic use. Consider non-barbiturate alternatives.
Reduce induction dose by 50% and administer slowly over 60 seconds; maintenance infusion rates at lower end (50-100 mcg/kg/min).
Barbiturates are habit-forming. Tolerance, psychological and physical dependence may occur. Withdrawal symptoms include delirium, convulsions, and death. Abrupt cessation after prolonged use is not recommended.
None.
Respiratory depression risk; use caution in hepatic impairment, renal impairment, elderly, or debilitated patients; avoid abrupt discontinuation; may cause paradoxical excitement; monitor for hypersensitivity reactions.
Respiratory depression and apnea may occur; resuscitative equipment must be available,Hypotension and bradycardia possible; use with caution in patients with cardiovascular disease,Extravasation causes tissue necrosis; avoid intra-arterial injection,Seizures may occur in epileptic patients,Rapid injection may cause severe respiratory depression
Hypersensitivity to barbiturates, porphyria, severe respiratory disease, severe hepatic impairment, history of addiction to sedative-hypnotics.
Known hypersensitivity to barbiturates,Porphyria (may precipitate acute attacks),Severe respiratory insufficiency,Status asthmaticus,Hypovolemic shock or severe hypotension
Avoid grapefruit juice as it may alter metabolism. Limit or avoid alcohol; concurrent use increases CNS depression risk. Take with food if GI upset occurs; avoid high-fat meals as they may slow absorption.
No specific food interactions are documented for BREVITAL SODIUM. However, patients should avoid heavy meals before anesthesia due to risk of aspiration. Do not consume alcohol or grapefruit juice for 24 hours before and after administration, as they may alter drug metabolism and increase sedation.
First trimester: Increased risk of major malformations, particularly oral clefts (odds ratio 2.0-3.0). Second trimester: Risk of neural tube defects and cardiac anomalies. Third trimester: Neonatal withdrawal syndrome, respiratory depression, and hemorrhagic disease due to vitamin K deficiency. FDA Category D.
Teratogenic potential not fully established in humans. In animal studies, methohexital caused fetal resorptions and malformations at maternally toxic doses. First trimester: Avoid unless essential; risk of neural tube defects cannot be excluded. Second trimester: Limited data, but may cause fetal depression if used near delivery. Third trimester: Crosses placenta; may cause neonatal respiratory depression, hypotonia, and prolonged sedation. Use only if clearly needed with lowest effective dose.
Excreted in breast milk; M/P ratio estimated 0.3-0.5. Risk of infant sedation, poor feeding, and withdrawal. Contraindicated in breastfeeding unless essential. Monitor for drowsiness, weight gain, and developmental milestones.
Excretion into human milk unknown. M/P ratio not determined. Due to short half-life, minimal transfer expected after a single dose. Caution with repeated doses or prolonged infusion. Monitor infant for sedation, feeding difficulties, or respiratory depression.
Increased clearance (up to 50% higher) in pregnancy, especially third trimester. Dose may need to be increased by 30-50% to maintain therapeutic effect. Monitor serum levels and adjust to minimum effective dose.
Pregnancy may increase volume of distribution and clearance, potentially requiring higher initial doses, but the induction dose typically unchanged. Reduced doses may be needed in preeclampsia or cesarean section due to enhanced sensitivity. No specific dose adjustment guidelines; titrate to effect with careful monitoring.
Barbiturate with rapid onset used for preoperative sedation and seizure control. Respiratory and CNS depression risk is dose-dependent; avoid in porphyria. Tolerance develops with prolonged use; withdrawal can be life-threatening. Use as second-line for status epilepticus after benzodiazepines. Highly protein-bound; monitor for interactions with warfarin and oral contraceptives.
BREVITAL SODIUM (methohexital) is an ultrashort-acting barbiturate used for induction of anesthesia and for short procedures. Due to its rapid onset and brief duration, it requires careful titration. It is contraindicated in patients with porphyria. Extravasation causes tissue necrosis; administer only through a secure IV line. It lowers seizure threshold, but can also be used for electroconvulsive therapy (ECT) to induce seizures. Respiratory depression and hypotension are dose-dependent; have resuscitation equipment ready. Avoid in patients with severe hepatic impairment. Coadministration with opioids or benzodiazepines potentiates sedation and respiratory depression.
Take exactly as prescribed; do not increase dose or frequency.,Avoid alcohol and other CNS depressants (e.g., opioids, benzodiazepines).,Do not drive or operate machinery until you know how this drug affects you.,Do not stop suddenly; abrupt discontinuation can cause withdrawal seizures.,Inform your doctor if you have a history of porphyria, liver disease, or depression.,Use effective contraception; this drug may reduce hormonal contraceptive efficacy.
BREVITAL SODIUM is a potent anesthetic that causes rapid loss of consciousness and should only be administered by trained medical professionals.,You may experience temporary pain or burning at the injection site; report any persistent pain or swelling to your healthcare provider.,Drowsiness, dizziness, and confusion may persist for several hours after the procedure; do not drive or operate machinery for at least 24 hours.,Avoid alcohol and other sedatives for 24 hours before and after the procedure as they may increase side effects.,Inform your doctor if you have a history of porphyria, liver disease, or drug allergies.,If you are pregnant or breastfeeding, discuss the risks and benefits with your healthcare provider.
"Butabarbital, a barbiturate, induces cytochrome P450 (CYP) enzymes, enhancing the hepatic metabolism of ketamine, a dissociative anesthetic primarily metabolized by CYP3A4 and CYP2B6. This interaction reduces ketamine's systemic exposure and anesthetic efficacy, potentially leading to suboptimal sedation or anesthesia. Additionally, concurrent use may increase the risk of respiratory depression and hypotension due to additive central nervous system (CNS) depressant effects."
"Butabarbital, a barbiturate, is a potent CNS depressant that acts primarily by potentiating GABA-A receptor activity. Metaxalone is a centrally acting muscle relaxant with sedative properties. Coadministration results in additive or synergistic CNS depression, leading to increased risk of excessive sedation, respiratory depression, impaired psychomotor function, and potential coma or death, especially at higher doses or in vulnerable patients."
"Butabarbital, a barbiturate sedative-hypnotic, induces hepatic cytochrome P450 enzymes, particularly CYP3A4, which are responsible for metabolizing the atypical antipsychotic paliperidone. This induction decreases plasma concentrations of paliperidone, potentially reducing its therapeutic efficacy in treating schizophrenia or bipolar disorder. Concomitant use may lead to relapse of psychiatric symptoms or necessitate dose adjustments."
No interactions on record
Explore head-to-head clinical comparisons of other medications in the same therapeutic classes.
Common clinical questions about BUTABARBITAL SODIUM vs BREVITAL SODIUM, answered by our medical review team.
BUTABARBITAL SODIUM is a Barbiturate that works by Depresses neuronal activity in the reticular activating system by enhancing GABA-A receptor-mediated chloride influx, increasing the duration of chloride channel opening and inhibiting excitatory neurotransmission at high doses.. BREVITAL SODIUM is a Barbiturate Anesthetic that works by Brevital sodium (methohexital) is a barbiturate that acts as a GABA-A receptor agonist, enhancing chloride ion influx and hyperpolarizing neurons, leading to rapid sedation and anesthesia.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between BUTABARBITAL SODIUM and BREVITAL SODIUM depend on the specific clinical indication. These are agents from distinct pharmacological classes and are not directly interchangeable by dose. A physician or clinical pharmacist should guide any therapeutic switching decisions.
The standard adult dose of BUTABARBITAL SODIUM is: Sedative: 15-30 mg orally 3-4 times daily. Hypnotic: 50-100 mg orally at bedtime. Maximum single dose: 100 mg. Maximum daily dose: 300 mg. Route: oral, intramuscular, intravenous. For IM/IV: divide oral dose by 2.. The standard adult dose of BREVITAL SODIUM is: Induction of anesthesia: 1-1.5 mg/kg IV bolus over 15 seconds; maintenance: 0.5-1 mg/kg IV bolus as needed or 50-150 mcg/kg/min IV infusion.. Dosing should always be individualized based on indication, renal and hepatic function, age, and other patient factors.
No direct drug-drug interaction has been formally documented between BUTABARBITAL SODIUM and BREVITAL SODIUM in current clinical databases. However, individual patient risk factors including other medications, organ function, and comorbidities should always be evaluated by a qualified healthcare provider.
The maternal-fetal safety profiles differ. BUTABARBITAL SODIUM is classified as Category C. First trimester: Increased risk of major malformations, particularly oral clefts (odds ratio 2.0-3.0). Second trimester: Risk of neural tube defects and cardiac anomalies. Third tr. BREVITAL SODIUM is classified as Category C. Teratogenic potential not fully established in humans. In animal studies, methohexital caused fetal resorptions and malformations at maternally toxic doses. First trimester: Avoid . Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.