Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
VALTOCO vs ONFI
Clinician-reviewed, head-to-head comparison of mechanism, dosing, pharmacokinetics, and safety profiles.
Last clinically reviewed: July 2026 · OpiCalc Medical Review Team
GABA-A receptor positive allosteric modulator; increases chloride ion conductance, hyperpolarizes neurons, and suppresses seizure activity.
GABA-A receptor positive allosteric modulator; increases the frequency of chloride channel opening in response to GABA.
Acute treatment of intermittent, stereotypic episodes of frequent seizure activity (i.e., seizure clusters, acute repetitive seizures) that are distinct from a patient's usual seizure pattern in patients with epilepsy aged 2 years and older
Treatment of seizures associated with Lennox-Gastaut syndrome,Adjunctive therapy for other seizure types
5 mg, 10 mg, 15 mg, or 20 mg intranasally as a single dose based on weight; for patients weighing <50 kg: 5 mg, 10 mg for 50-75 kg, 15 mg for 75-100 kg, 20 mg for >100 kg. In adults, maximum dose is 20 mg per seizure cluster.
Initial: 10 mg orally twice daily; may increase by 10 mg/day after 1 week to maintenance of 20–40 mg/day in two divided doses. Maximum: 60 mg/day.
Terminal elimination half-life: 15-17 hours (range 11-20 h) in adults; no dose adjustment for age or renal impairment is recommended, but clinical monitoring is prudent in hepatic impairment.
The terminal elimination half-life of clobazam is 36–42 hours. The active metabolite N-desmethylclobazam has a half-life of 71–82 hours. The long half-life permits once-daily dosing but also leads to slow accumulation; steady-state is achieved after 2–3 weeks.
Hepatic via CYP3A4 and CYP2C9; active metabolite desmethyldiazepam (nordazepam)
Hepatic via CYP3A4 and CYP2C19; primary metabolite N-desmethylclobazam is active.
Renal (70% as unchanged drug and metabolites, primarily glucuronide conjugate, with <2% as unchanged drug); biliary/fecal (30%)
Clobazam (ONFI) undergoes extensive hepatic metabolism. Approximately 82% of the dose is eliminated in urine (as unchanged drug and metabolites) and about 11% in feces. Unchanged clobazam accounts for <1% of urinary excretion. The major metabolite, N-desmethylclobazam, is excreted primarily renally.
96% bound, primarily to albumin
Clobazam is approximately 80–90% bound to plasma proteins, primarily albumin.
0.5-0.8 L/kg; approximates total body water, indicating extensive tissue distribution.
The apparent volume of distribution is approximately 100 L (range 77–120 L), or roughly 1.4 L/kg. This large Vd indicates extensive tissue distribution and accumulation in fatty tissues.
Intranasal: 75% (range 65-85%) relative to intravenous; rectal: 70-90% relative to intravenous.
Oral bioavailability is nearly complete (>90%). Clobazam is well absorbed after oral administration with only minor first-pass metabolism.
No dosage adjustment required for mild to moderate renal impairment. Severe renal impairment (e GFR <15 m L/min): consider using lower doses due to increased exposure; use with caution.
No specific GFR-based dose adjustments; use with caution in severe impairment (Cr Cl < 30 m L/min) due to potential for increased sedation.
Child-Pugh A or B: no adjustment needed. Child-Pugh C: reduce dose by 50% due to increased diazepam exposure.
Mild to moderate (Child-Pugh A/B): Initial 5 mg orally twice daily; may increase by 5 mg/day after 1 week to maximum 20 mg/day. Severe (Child-Pugh C): Not recommended.
Age 6-17 years: 0.2 mg/kg intranasally, maximum single dose 20 mg. Administer as single dose per seizure cluster. Not recommended for children <6 years.
Clobazam (ONFI) for seizures: Age 2 to <6 years, body weight ≥12.5 kg: Initial 5 mg orally once daily; titrate to maintenance 5 mg twice daily. Age ≥6 years: Weight ≤30 kg: Initial 5 mg once daily; titrate to 5 mg twice daily (max 20 mg/day). Weight >30 kg: same as adult dosing. Administer with food.
Elderly patients may have increased sensitivity; consider starting at lower end of dosing range (5-10 mg) and titrate based on response and tolerability. Use with caution due to risk of sedation and falls.
Elderly (≥65 years): Initial 5 mg orally twice daily; increase slowly to lowest effective maintenance due to increased sensitivity and risk of falls. Avoid doses above 20 mg/day unless clearly necessary.
WARNING: RISK OF RESPIRATORY DEPRESSION AND CARDIAC ARREST WITH CONCOMITANT USE OF ALCOHOL OR OTHER CNS DEPRESSANTS; RISK OF SUBSTANCE ABUSE, DEPENDENCE, AND WITHDRAWAL; WITHDRAWAL SEIZURES; AND RISK OF SERIOUS SKIN REACTIONS.
Concomitant use with opioids may result in profound sedation, respiratory depression, coma, and death. Reserve concomitant use for patients for whom alternative treatment options are inadequate.
Risk of CNS depression and impaired motor function,Risk of abuse and dependence,Risk of withdrawal seizures upon abrupt discontinuation,Risk of serious skin reactions (e.g., Stevens-Johnson syndrome),Concomitant use with opioids may cause profound sedation, respiratory depression, coma, and death,Use in patients with compromised respiratory function or hepatic impairment requires caution
Risk of respiratory depression, especially with opioids,Sedation and somnolence,Risk of abuse and dependence,Withdrawal seizures on abrupt discontinuation,Increased risk of suicidal thoughts or behavior
Hypersensitivity to diazepam or any component of the formulation,Acute narrow-angle glaucoma,Concomitant use with opioid analgesics for acute treatment of seizure clusters (unless alternative treatments are not available)
Hypersensitivity to clobazam or any component of formulation,Severe hepatic impairment
No specific food interactions. Avoid alcohol consumption during VALTOCO use as it may increase CNS depressant effects.
Avoid grapefruit and grapefruit juice as they may increase clobazam levels. No other significant food interactions are known. CNS depressant effects may be potentiated by alcohol.
Diazepam (active moiety in VALTOCO) is Pregnancy Category D. First trimester: Associated with increased risk of congenital malformations, particularly cleft lip/palate, when used chronically. Second and third trimesters: May cause fetal benzodiazepine exposure leading to floppy infant syndrome, neonatal withdrawal, and central nervous system depression. Late third trimester or delivery: Risk of neonatal respiratory depression, hypotonia, and feeding difficulties.
Pregnancy Category C. First trimester: increased risk of major malformations including cleft lip/palate (OR 2.0-3.0); second/third trimester: risk of neonatal withdrawal, hypotonia, poor feeding, respiratory depression, and hypothermia; consistent exposure may cause floppy infant syndrome. Late pregnancy exposure linked to neonatal benzodiazepine withdrawal syndrome.
Diazepam is excreted into breast milk with an M/P ratio approximately 0.3. The relative infant dose is low (2-5% of weight-adjusted maternal dose). Caution is advised due to potential accumulation in neonates (long half-life) causing sedation, poor feeding, and respiratory depression. Use only if clearly needed with infant monitoring.
Clobazam is excreted into breast milk; M/P ratio approximately 0.5-0.6. Accumulation possible in neonates; monitor for sedation, poor feeding, apnea. Avoid if infant has impaired hepatic function or low birth weight. American Academy of Pediatrics recommends caution; use lowest effective maternal dose.
No specific dose adjustment recommended for VALTOCO during pregnancy for acute seizure management. However, due to increased volume of distribution and altered protein binding in pregnancy, a higher dose or more frequent dosing may be required for chronic use; clinical response should guide titration. Monitor for excessive sedation or respiratory depression as clearance may be reduced in late pregnancy.
Increased clearance during pregnancy (CYP3A4 induction); plasma concentrations may decrease by 30-50% in third trimester. Dose adjustments often required: monitor therapeutic response and consider dose increase by 50-100% in late pregnancy; postpartum reduce to prepregnancy dose over 1-2 weeks to avoid toxicity.
VALTOCO (diazepam nasal spray) is indicated for acute treatment of intermittent, stereotypic episodes of frequent seizure activity (i.e., seizure clusters, acute repetitive seizures) in patients with epilepsy aged 6 years and older. Administer one spray into one nostril; if needed, a second spray into the opposite nostril can be given after 4 hours if seizure activity persists. Do not use more than two doses per episode. Onset of action is rapid (within 2-5 minutes). Monitor for respiratory depression, especially in patients with compromised respiratory function or concomitant CNS depressants. Each spray delivers 5 mg or 10 mg diazepam; the dose depends on patient weight (5 mg for <40 kg, 10 mg for ≥40 kg). Tilt patient's head back slightly during administration. Do not reuse the device; discard after use.
ONFI (clobazam) is a benzodiazepine indicated for seizures associated with Lennox-Gastaut syndrome. Titrate slowly to minimize sedation. Monitor for withdrawal symptoms upon discontinuation; taper over several weeks. Not recommended for use in patients with severe hepatic impairment (Child-Pugh C). For patients on other CNS depressants, consider dose reduction. Clobazam's active metabolite, N-desmethylclobazam, has a long half-life (36-46 hours) and can accumulate, especially in poor CYP2C19 metabolizers. In such patients, consider lower doses and monitor for excessive sedation.
Use VALTOCO exactly as prescribed; only for seizure clusters, not for daily seizures.,Administer one spray into one nostril; do not prime the device.,After administration, tilt head back slightly and breathe normally.,If seizure activity continues after 4 hours, a second dose may be given in the opposite nostril.,Do not use more than two doses per seizure episode; if ineffective, seek emergency medical help.,Store at room temperature (20-25°C); protect from light and moisture.,Keep out of reach of children; discard device after use.,May cause dizziness, drowsiness, or coordination problems; avoid driving or operating machinery until effects wear off.,Inform healthcare provider of all medications, especially CNS depressants (e.g., alcohol, opioids, sedatives).,Do not consume alcohol while using VALTOCO.
Take ONFI exactly as prescribed; do not stop suddenly as withdrawal seizures may occur.,Avoid alcohol and other sedatives while taking this medication due to increased risk of drowsiness and respiratory depression.,Report any unusual mood changes, depression, or suicidal thoughts to your healthcare provider.,Do not drive or operate heavy machinery until you know how ONFI affects you, as it can cause dizziness and drowsiness.,If you are pregnant, planning to become pregnant, or breastfeeding, discuss with your doctor before using ONFI.,Store at room temperature, away from moisture and heat.
No interactions on record
No interactions on record
Explore head-to-head clinical comparisons of other medications in the same therapeutic classes.
Common clinical questions about VALTOCO vs ONFI, answered by our medical review team.
VALTOCO is a Benzodiazepine Anticonvulsant that works by GABA-A receptor positive allosteric modulator; increases chloride ion conductance, hyperpolarizes neurons, and suppresses seizure activity.. ONFI is a Benzodiazepine Anticonvulsant that works by GABA-A receptor positive allosteric modulator; increases the frequency of chloride channel opening in response to GABA.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between VALTOCO and ONFI depend on the specific clinical indication. These are both Benzodiazepine Anticonvulsant agents and are not directly interchangeable by dose. A physician or clinical pharmacist should guide any therapeutic switching decisions.
The standard adult dose of VALTOCO is: 5 mg, 10 mg, 15 mg, or 20 mg intranasally as a single dose based on weight; for patients weighing <50 kg: 5 mg, 10 mg for 50-75 kg, 15 mg for 75-100 kg, 20 mg for >100 kg. In adults, maximum dose is 20 mg per seizure cluster.. The standard adult dose of ONFI is: Initial: 10 mg orally twice daily; may increase by 10 mg/day after 1 week to maintenance of 20–40 mg/day in two divided doses. Maximum: 60 mg/day.. 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 VALTOCO and ONFI 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. VALTOCO is classified as Category C. Diazepam (active moiety in VALTOCO) is Pregnancy Category D. First trimester: Associated with increased risk of congenital malformations, particularly cleft lip/palate, when used c. ONFI is classified as Category C. Pregnancy Category C. First trimester: increased risk of major malformations including cleft lip/palate (OR 2.0-3.0); second/third trimester: risk of neonatal withdrawal, hypotonia. Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.