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Flurazepam: Pediatric drug information

Flurazepam: Pediatric drug information
2025© UpToDate, Inc. and its affiliates and/or licensors. All Rights Reserved.
For additional information see "Flurazepam: Drug information" and "Flurazepam: Patient drug information"

For abbreviations, symbols, and age group definitions show table
ALERT: US Boxed Warning
Risk from concomitant use with opioids:

Concomitant use of benzodiazepines and opioids may result in profound sedation, respiratory depression, coma, and death. Reserve concomitant prescribing of these drugs in patients for whom alternative treatment options are inadequate. Limit dosages and durations to the minimum required. Follow patients for signs and symptoms of respiratory depression and sedation.

Abuse, misuse, and addiction:

The use of benzodiazepines, including flurazepam, exposes users to risks of abuse, misuse, and addiction, which can lead to overdose or death. Abuse and misuse of benzodiazepines commonly involve concomitant use of other medications, alcohol, and/or illicit substances, which is associated with an increased frequency of serious adverse outcomes. Before prescribing flurazepam and throughout treatment, assess each patient's risk for abuse, misuse, and addiction.

Dependence and withdrawal reactions:

The continued use of benzodiazepines, including flurazepam, may lead to clinically significant physical dependence. The risks of dependence and withdrawal increase with longer treatment duration and higher daily dose. Abrupt discontinuation or rapid dosage reduction of flurazepam after continued use may precipitate acute withdrawal reactions, which can be life-threatening. To reduce the risk of withdrawal reactions, use a gradual taper to discontinue flurazepam or reduce the dosage.

Therapeutic Category
  • Benzodiazepine;
  • Hypnotic;
  • Sedative
Dosing: Pediatric
Insomnia

Insomnia: Limited data available: Adolescents ≥15 years: Oral: 15 mg at bedtime (Ref).

Dosage adjustment for concomitant therapy: Significant drug interactions exist, requiring dose/frequency adjustment or avoidance. Consult drug interactions database for more information.

Dosing: Kidney Impairment: Pediatric

There are no dosing adjustments provided in the manufacturer's labeling.

Dosing: Liver Impairment: Pediatric

There are no dosing adjustments provided in the manufacturer's labeling.

Dosing: Adult

(For additional information see "Flurazepam: Drug information")

Dosage guidance:

Safety: Reduce dose or avoid use in patients receiving opioids or with significant chronic disease (eg, respiratory compromise) (Ref). Avoid use in patients with a history of substance use, misuse of medications, or depression (Ref).

Insomnia, sleep onset or sleep maintenance

Insomnia, sleep onset or sleep maintenance (alternative agent):

Note: Due to risk of next day impairment, dependence, and habituation, benzodiazepines should be reserved for patients in whom alternative, safer therapies for insomnia have failed (Ref). When used, limit long-term use (>4 weeks) to cases for which nonpharmacologic treatments are not available or not effective and benefits are felt to outweigh risks (Ref).

Oral: Initial: 15 mg at bedtime, as needed; may increase daily dose to 30 mg at bedtime based on response and tolerability.

Discontinuation of therapy : When prescribing benzodiazepines for insomnia, reduce by 25% of the original dose every 1 to 2 weeks until lowest available dose is reached, then discontinue (flurazepam can be reduced in 15 mg increments). Patients on long-term therapy or in whom discontinuation has previously failed may benefit from a slower taper in conjunction with cognitive behavioral therapy for insomnia (Ref).

Dosage adjustment for concomitant therapy: Significant drug interactions exist, requiring dose/frequency adjustment or avoidance. Consult drug interactions database for more information.

Dosing: Kidney Impairment: Adult

There are no dosage adjustments provided in the manufacturer's labeling; use with caution.

Dosing: Liver Impairment: Adult

There are no dosage adjustments provided in the manufacturer's labeling; use with caution.

Adverse Reactions

The following adverse drug reactions and incidences are derived from product labeling unless otherwise specified. Frequency not defined.

Cardiovascular: Chest pain, flushing, hypotension, palpitations, syncope

Central nervous system: Abnormal reflexes (slowing), apprehension, ataxia, bitter taste, body pain, confusion, depression, dizziness, drowsiness, drug dependence, dysarthria, euphoria, falling, hallucination, hangover effect, headache, irritability, memory impairment, nervousness, paradoxical reaction, restlessness, slurred speech, staggering, talkativeness

Dermatologic: Diaphoresis, pruritus, skin rash

Endocrine & metabolic: Weight gain, weight loss

Gastrointestinal: Constipation, decreased appetite, diarrhea, gastric distress, gastrointestinal pain, heartburn, increased appetite, nausea, sialorrhea, vomiting, xerostomia

Hematologic & oncologic: Granulocytopenia, leukopenia

Hepatic: Abnormal bilirubin levels (total bilirubin increased), cholestatic jaundice, increased serum alkaline phosphatase, increased serum ALT, increased serum AST

Neuromuscular & skeletal: Arthralgia, weakness

Ophthalmic: Accommodation disturbance, blurred vision, burning sensation of eyes

Respiratory: Apnea, dyspnea

<1%, postmarketing, and/or case reports: Anaphylaxis, angioedema, parasomnias (cooking while sleeping, making phone calls while sleeping, sleep driving, sleep eating)

Contraindications

Hypersensitivity to flurazepam, other benzodiazepines, or any component of the formulation; pregnancy.

Canadian labeling: Additional contraindications (not in US labeling): Severe respiratory function impairment (eg, significant sleep apnea syndrome); myasthenia gravis; severe hepatic impairment.

Warnings/Precautions

Concerns related to adverse effects:

• Anterograde amnesia: Benzodiazepines have been associated with anterograde amnesia (Nelson 1999).

• CNS depression: May cause CNS depression, which may impair physical or mental abilities; patients must be cautioned about performing tasks that require mental alertness (eg, operating machinery, driving).

• Hypersensitivity reactions: Reports of hypersensitivity reactions, including anaphylaxis and angioedema, have been reported with flurazepam. Patients who develop angioedema should not be rechallenged with flurazepam.

• Paradoxical reactions: Paradoxical reactions, including hyperactive or aggressive behavior, have been reported with benzodiazepines; risk may be increased in adolescent/pediatric patients, geriatric patients, or patients with a history of alcohol use disorder or psychiatric/personality disorders (Mancuso 2004).

• Sleep-related activities: Hazardous sleep-related activities such as sleep-driving, cooking and eating food, and making phone calls while asleep have been noted with benzodiazepines (Dolder 2008).

Disease-related concerns:

• Depression: Avoid use in patients with depression because of concerns about worsening mood symptoms, particularly if suicidal risk may be present, except for acute or emergency situations (eg, acute agitation, status epilepticus) (Craske 2022).

• Hepatic impairment: Use with caution in patients with hepatic impairment.

• Renal impairment: Use with caution in patients with renal impairment.

• Respiratory disease: Reduce dose or avoid use in patients with respiratory disease, including chronic obstructive pulmonary disease or sleep apnea. Benzodiazepines may cause significant respiratory depression.

• Sleep apnea: Benzodiazepines can suppress respiratory drive in patients with obstructive sleep apnea; use caution when prescribing for insomnia in this population (Webster 2020).

Special populations:

• Debilitated patients: Use with caution in debilitated patients.

• Older adult: Older adult patients may be at an increased risk of death with use; risk has been found highest within the first 4 months of use in older adult dementia patients (Jennum 2015; Saarelainen 2018).

• Fall risk: Use with extreme caution in patients who are at risk of falls; benzodiazepines have been associated with falls and traumatic injury (Nelson 1999).

Other warnings/precautions:

• Abuse, misuse, and substance use disorder: Counsel patients at increased risk on proper use and monitoring for signs and symptoms of abuse, misuse, and substance use disorder. Institute early treatment or refer patients in whom substance use disorder is suspected. Limit dosages and durations to the minimum required.

• Appropriate use: Does not have analgesic, antidepressant, or antipsychotic properties. As a hypnotic, should be used only after evaluation of potential causes of sleep disturbance. Failure of sleep disturbance to resolve after 7 to 10 days may indicate psychiatric or medical illness. A worsening of insomnia or the emergence of new abnormalities of thought or behavior may represent unrecognized psychiatric or medical illness and requires immediate and careful evaluation.

• Dependence and withdrawal reactions: Some patients may develop a protracted withdrawal syndrome lasting >12 months; may be difficult to differentiate withdrawal symptoms from reemergence or continuation of symptoms for which benzodiazepines were prescribed. Flumazenil may cause withdrawal in patients receiving long-term benzodiazepine therapy.

• Rebound insomnia: Following withdrawal of therapy, transient insomnia may recur accompanied by other reactions, including restlessness, anxiety, and mood changes (Bélanger 2009).

• Tolerance: Flurazepam is a long half-life benzodiazepine. Duration of action after a single dose is determined by redistribution rather than metabolism. Tolerance develops to the hypnotic effects (Vinkers 2012). Chronic use of this agent may increase the perioperative benzodiazepine dose needed to achieve desired effect.

• Withdrawal: A longer sleep-onset latency and increased awakenings during sleep may occur for 1 to 2 days following the discontinuation of GABA-mediated (GABAergic) medications. A more severe withdrawal syndrome may rarely occur following abrupt discontinuation or large decreases in dose after sustained use (>10 days), and is characterized by new-onset agitation, ataxia, depersonalization, dizziness, dysphoria, fatigue, headache, hypersensitivity to stimuli, irritability, muscle cramps or pain, nausea, sweating, twitching, vomiting, and weakness. This withdrawal syndrome generally resolves within weeks or upon reinitiation of the GABAergic medication. Intermittent dosing may reduce the risk of withdrawal symptoms (BAP [Wilson 2019]). Use caution when reducing dose or withdrawing therapy; decrease slowly and monitor for withdrawal symptoms.

Dosage Forms: US

Excipient information presented when available (limited, particularly for generics); consult specific product labeling.

Capsule, Oral, as hydrochloride:

Generic: 15 mg, 30 mg

Generic Equivalent Available: US

Yes

Pricing: US

Capsules (Flurazepam HCl Oral)

15 mg (per each): $21.80

30 mg (per each): $22.88

Disclaimer: A representative AWP (Average Wholesale Price) price or price range is provided as reference price only. A range is provided when more than one manufacturer's AWP price is available and uses the low and high price reported by the manufacturers to determine the range. The pricing data should be used for benchmarking purposes only, and as such should not be used alone to set or adjudicate any prices for reimbursement or purchasing functions or considered to be an exact price for a single product and/or manufacturer. Medi-Span expressly disclaims all warranties of any kind or nature, whether express or implied, and assumes no liability with respect to accuracy of price or price range data published in its solutions. In no event shall Medi-Span be liable for special, indirect, incidental, or consequential damages arising from use of price or price range data. Pricing data is updated monthly.

Dosage Forms: Canada

Excipient information presented when available (limited, particularly for generics); consult specific product labeling.

Capsule, Oral, as hydrochloride:

Generic: 15 mg, 30 mg

Controlled Substance

C-IV

Administration: Pediatric

Oral: May be administered without regard to meals; administer dose at bedtime

Storage/Stability

Store at 20°C to 25°C (68°F to 77°F); protect from light.

Medication Guide and/or Vaccine Information Statement (VIS)

An FDA-approved patient medication guide, which is available with the product information and at http://www.accessdata.fda.gov/drugsatfda_docs/label/2009/016721s077lbl.pdf, must be dispensed with this medication.

Use

Short-term treatment of insomnia (FDA approved in adults)

Medication Safety Issues
Sound-alike/look-alike issues:

Flurazepam may be confused with temazepam

Dalmane may be confused with Demulen

High alert medication:

The Institute for Safe Medication Practices (ISMP) includes this medication among its list of drugs (contraindicated in pregnancy) which have a heightened risk of causing significant patient harm when used in error (High-Alert Medications in Community/Ambulatory Care Settings).

Older Adult: High-Risk Medication:

Beers Criteria: Benzodiazepines (flurazepam) are identified in the Beers Criteria as potentially inappropriate medications to be avoided in patients 65 years and older due to risk of abuse, misuse, physical dependence, and addiction. In addition, older adults have an increased risk of impaired cognition, delirium, falls, fractures, and motor vehicle accidents with benzodiazepine use, and slower metabolism of long-acting benzodiazepines (eg, flurazepam) (Beers Criteria [AGS 2023]).

Metabolism/Transport Effects

None known.

Drug Interactions

Note: Interacting drugs may not be individually listed below if they are part of a group interaction (eg, individual drugs within “CYP3A4 Inducers [Strong]” are NOT listed). For a complete list of drug interactions by individual drug name and detailed management recommendations, use the drug interactions program by clicking on the “Launch drug interactions program” link above.

Note: Interacting drugs may not be individually listed below if they are part of a group interaction (eg, individual drugs within “CYP3A4 Inducers [Strong]” are NOT listed). For a complete list of drug interactions by individual drug name and detailed management recommendations, use the drug interactions program

Acrivastine: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Alcohol (Ethyl): CNS Depressants may increase CNS depressant effects of Alcohol (Ethyl). Risk C: Monitor

Alizapride: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Amisulpride (Oral): May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

ARIPiprazole Lauroxil: May increase CNS depressant effects of Benzodiazepines. ARIPiprazole Lauroxil may increase hypotensive effects of Benzodiazepines. Specifically, the risk of orthostatic hypotension may be increased. Risk C: Monitor

ARIPiprazole: May increase CNS depressant effects of Benzodiazepines. ARIPiprazole may increase hypotensive effects of Benzodiazepines. Specifically, orthostatic hypotension may be increased. Risk C: Monitor

Articaine: May increase CNS depressant effects of CNS Depressants. Management: Consider reducing the dose of articaine if possible when used in patients who are also receiving CNS depressants. Monitor for excessive CNS depressant effects with any combined use. Risk D: Consider Therapy Modification

Azelastine (Nasal): May increase CNS depressant effects of CNS Depressants. Risk X: Avoid

Benperidol: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Beta-Acetyldigoxin: Benzodiazepines may increase serum concentration of Beta-Acetyldigoxin. Risk C: Monitor

Blonanserin: CNS Depressants may increase CNS depressant effects of Blonanserin. Management: Use caution if coadministering blonanserin and CNS depressants; dose reduction of the other CNS depressant may be required. Strong CNS depressants should not be coadministered with blonanserin. Risk D: Consider Therapy Modification

Brexanolone: CNS Depressants may increase CNS depressant effects of Brexanolone. Risk C: Monitor

Brimonidine (Topical): May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Bromopride: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Bromperidol: May increase CNS depressant effects of CNS Depressants. Risk X: Avoid

Buclizine: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Buprenorphine: CNS Depressants may increase CNS depressant effects of Buprenorphine. Management: Consider reduced doses of other CNS depressants, and avoiding such drugs in patients at high risk of buprenorphine overuse/self-injection. Initiate buprenorphine at lower doses in patients already receiving CNS depressants. Risk D: Consider Therapy Modification

BusPIRone: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Cannabinoid-Containing Products: CNS Depressants may increase CNS depressant effects of Cannabinoid-Containing Products. Risk C: Monitor

Certoparin: May increase serum concentration of Benzodiazepines. Risk C: Monitor

Cetirizine (Systemic): May increase CNS depressant effects of CNS Depressants. Management: Consider avoiding this combination if possible. If required, monitor for excessive sedation or CNS depression, limit the dose and duration of combination therapy, and consider CNS depressant dose reductions. Risk D: Consider Therapy Modification

Chloral Hydrate/Chloral Betaine: CNS Depressants may increase CNS depressant effects of Chloral Hydrate/Chloral Betaine. Management: Consider alternatives to the use of chloral hydrate or chloral betaine and additional CNS depressants. If combined, consider a dose reduction of either agent and monitor closely for enhanced CNS depressive effects. Risk D: Consider Therapy Modification

Chlormethiazole: May increase CNS depressant effects of CNS Depressants. Management: Monitor closely for evidence of excessive CNS depression. The chlormethiazole labeling states that an appropriately reduced dose should be used if such a combination must be used. Risk D: Consider Therapy Modification

Chlorphenesin Carbamate: May increase adverse/toxic effects of CNS Depressants. Risk C: Monitor

CloZAPine: Benzodiazepines may increase adverse/toxic effects of CloZAPine. Management: Consider decreasing the dose of (or possibly discontinuing) benzodiazepines prior to initiating clozapine. Monitor for respiratory depression, hypotension, and other toxicities if these agents are combined. Risk D: Consider Therapy Modification

CNS Depressants: May increase adverse/toxic effects of CNS Depressants. Risk C: Monitor

Corticosteroids (Orally Inhaled): Benzodiazepines may increase adverse/toxic effects of Corticosteroids (Orally Inhaled). Specifically, the risk of pneumonia may be increased. Risk C: Monitor

Dantrolene: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Daridorexant: May increase CNS depressant effects of CNS Depressants. Management: Dose reduction of daridorexant and/or any other CNS depressant may be necessary. Use of daridorexant with alcohol is not recommended, and the use of daridorexant with any other drug to treat insomnia is not recommended. Risk D: Consider Therapy Modification

DexmedeTOMIDine: CNS Depressants may increase CNS depressant effects of DexmedeTOMIDine. Management: Monitor for increased CNS depression during coadministration of dexmedetomidine and CNS depressants, and consider dose reductions of either agent to avoid excessive CNS depression. Risk D: Consider Therapy Modification

Difelikefalin: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Difenoxin: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Dihydralazine: CNS Depressants may increase hypotensive effects of Dihydralazine. Risk C: Monitor

Dimethindene (Topical): May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Dothiepin: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Doxylamine: CNS Depressants may increase CNS depressant effects of Doxylamine. Risk C: Monitor

DroPERidol: May increase CNS depressant effects of CNS Depressants. Management: Consider dose reductions of droperidol or of other CNS agents (eg, opioids, barbiturates) with concomitant use. Risk D: Consider Therapy Modification

Emedastine (Systemic): May increase CNS depressant effects of CNS Depressants. Management: Consider avoiding this combination if possible. If required, monitor for excessive sedation or CNS depression, limit the dose and duration of combination therapy, and consider CNS depressant dose reductions. Risk C: Monitor

Entacapone: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Esketamine (Nasal): May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Flunarizine: CNS Depressants may increase CNS depressant effects of Flunarizine. Risk X: Avoid

Flunitrazepam: CNS Depressants may increase CNS depressant effects of Flunitrazepam. Management: Reduce the dose of CNS depressants when combined with flunitrazepam and monitor patients for evidence of CNS depression (eg, sedation, respiratory depression). Use non-CNS depressant alternatives when available. Risk D: Consider Therapy Modification

Fosamprenavir: May increase serum concentration of Flurazepam. Risk C: Monitor

HydrOXYzine: May increase CNS depressant effects of CNS Depressants. Management: Consider a decrease in the CNS depressant dose, as appropriate, when used together with hydroxyzine. Increase monitoring of signs/symptoms of CNS depression in any patient receiving hydroxyzine together with another CNS depressant. Risk D: Consider Therapy Modification

Ilaprazole: May increase serum concentration of Benzodiazepines. Risk C: Monitor

Ixabepilone: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Kava Kava: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Ketotifen (Systemic): May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Kratom: May increase CNS depressant effects of CNS Depressants. Risk X: Avoid

Lemborexant: May increase CNS depressant effects of CNS Depressants. Management: Dosage adjustments of lemborexant and of concomitant CNS depressants may be necessary when administered together because of potentially additive CNS depressant effects. Close monitoring for CNS depressant effects is necessary. Risk D: Consider Therapy Modification

Levocetirizine: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Lisuride: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Lofepramine: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Lofexidine: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Loxapine: CNS Depressants may increase CNS depressant effects of Loxapine. Management: Consider reducing the dose of CNS depressants administered concomitantly with loxapine due to an increased risk of respiratory depression, sedation, hypotension, and syncope. Risk D: Consider Therapy Modification

Magnesium Sulfate: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Melatonin: May increase sedative effects of Benzodiazepines. Risk C: Monitor

Melitracen [INT]: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Mequitazine: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Metergoline: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Methadone: Benzodiazepines may increase CNS depressant effects of Methadone. Management: Clinicians should generally avoid concurrent use of methadone and benzodiazepines when possible; any combined use should be undertaken with extra caution. Risk D: Consider Therapy Modification

Methotrimeprazine: CNS Depressants may increase CNS depressant effects of Methotrimeprazine. Methotrimeprazine may increase CNS depressant effects of CNS Depressants. Management: Reduce the usual dose of CNS depressants by 50% if starting methotrimeprazine until the dose of methotrimeprazine is stable. Monitor patient closely for evidence of CNS depression. Risk D: Consider Therapy Modification

Methoxyflurane: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Metoclopramide: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

MetyroSINE: CNS Depressants may increase sedative effects of MetyroSINE. Risk C: Monitor

Minocycline (Systemic): May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Moxonidine: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Nabilone: May increase CNS depressant effects of CNS Depressants. Risk X: Avoid

Nalfurafine: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Nirmatrelvir and Ritonavir: May increase serum concentration of Flurazepam. Risk C: Monitor

Noscapine: CNS Depressants may increase adverse/toxic effects of Noscapine. Risk X: Avoid

OLANZapine: Benzodiazepines may increase adverse/toxic effects of OLANZapine. Management: Monitor closely for hypotension, respiratory or central nervous system depression, and bradycardia if olanzapine is combined with benzodiazepines. Use of parenteral benzodiazepines with IM olanzapine is not recommended. Risk C: Monitor

Olopatadine (Nasal): May increase CNS depressant effects of CNS Depressants. Risk X: Avoid

Opicapone: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Opioid Agonists: CNS Depressants may increase CNS depressant effects of Opioid Agonists. Management: Avoid concomitant use of opioid agonists and benzodiazepines or other CNS depressants when possible. These agents should only be combined if alternative treatment options are inadequate. If combined, limit the dosages and duration of each drug. Risk D: Consider Therapy Modification

Opipramol: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Orphenadrine: CNS Depressants may increase CNS depressant effects of Orphenadrine. Risk X: Avoid

Oxomemazine: May increase CNS depressant effects of CNS Depressants. Risk X: Avoid

Oxybate Salt Products: Benzodiazepines may increase CNS depressant effects of Oxybate Salt Products. Risk X: Avoid

OxyCODONE: CNS Depressants may increase CNS depressant effects of OxyCODONE. Management: Avoid concomitant use of oxycodone and benzodiazepines or other CNS depressants when possible. These agents should only be combined if alternative treatment options are inadequate. If combined, limit the dosages and duration of each drug. Risk D: Consider Therapy Modification

Paliperidone: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Paraldehyde: CNS Depressants may increase CNS depressant effects of Paraldehyde. Risk X: Avoid

Perampanel: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Periciazine: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Pipamperone: May increase adverse/toxic effects of CNS Depressants. Risk C: Monitor

Piribedil: CNS Depressants may increase CNS depressant effects of Piribedil. Risk C: Monitor

Pizotifen: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Pramipexole: CNS Depressants may increase sedative effects of Pramipexole. Risk C: Monitor

Procarbazine: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Rilmenidine: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Ritonavir: May increase serum concentration of Flurazepam. Risk C: Monitor

Ropeginterferon Alfa-2b: CNS Depressants may increase adverse/toxic effects of Ropeginterferon Alfa-2b. Specifically, the risk of neuropsychiatric adverse effects may be increased. Management: Avoid coadministration of ropeginterferon alfa-2b and other CNS depressants. If this combination cannot be avoided, monitor patients for neuropsychiatric adverse effects (eg, depression, suicidal ideation, aggression, mania). Risk D: Consider Therapy Modification

ROPINIRole: CNS Depressants may increase sedative effects of ROPINIRole. Risk C: Monitor

Rotigotine: CNS Depressants may increase sedative effects of Rotigotine. Risk C: Monitor

Saquinavir: May increase serum concentration of Flurazepam. Risk C: Monitor

Suvorexant: CNS Depressants may increase CNS depressant effects of Suvorexant. Management: Dose reduction of suvorexant and/or any other CNS depressant may be necessary. Use of suvorexant with alcohol is not recommended, and the use of suvorexant with any other drug to treat insomnia is not recommended. Risk D: Consider Therapy Modification

Teduglutide: May increase serum concentration of Benzodiazepines. Risk C: Monitor

Thalidomide: CNS Depressants may increase CNS depressant effects of Thalidomide. Risk X: Avoid

Theophylline Derivatives: May decrease therapeutic effects of Benzodiazepines. Risk C: Monitor

Trimeprazine: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Valerian: May increase CNS depressant effects of CNS Depressants. Risk C: Monitor

Yohimbine: May decrease therapeutic effects of Antianxiety Agents. Risk C: Monitor

Zolpidem: CNS Depressants may increase CNS depressant effects of Zolpidem. Management: Reduce the Intermezzo brand sublingual zolpidem adult dose to 1.75 mg for men who are also receiving other CNS depressants. No such dose change is recommended for women. Avoid use with other CNS depressants at bedtime; avoid use with alcohol. Risk D: Consider Therapy Modification

Zuranolone: May increase CNS depressant effects of CNS Depressants. Management: Consider alternatives to the use of zuranolone with other CNS depressants or alcohol. If combined, consider a zuranolone dose reduction and monitor patients closely for increased CNS depressant effects. Risk D: Consider Therapy Modification

Food Interactions

Benzodiazepine serum concentrations may be increased by grapefruit juice. Management: Limit or avoid grapefruit juice (Bjornsson 2003).

Pregnancy Considerations

In utero exposure to benzodiazepines has the potential to cause harm to the fetus. Teratogenic effects have been observed in some studies; however, a clear association has not been reported and additional data are needed (Bellantuono 2013; Chuang 2024; Freeman 2018; Grigoriadis 2019; Tinker 2019; Wu 2024). Exposure to a benzodiazepine late in pregnancy may cause neonatal sedation (hypotonia, lethargy, respiratory depression) and/or symptoms of neonatal withdrawal (feeding difficulties, hyperreflexia, inconsolable crying, irritability, restlessness, tremors) (Iqbal 2002). Monitor newborns exposed to flurazepam in utero for adverse events. Data related to long-term effects on neurodevelopment following maternal use of benzodiazepines are inconclusive (Andrade 2024; Radojčić 2017; Sundbakk 2025; Wang 2022).

Treatment for insomnia in pregnant patients should be individualized. Untreated insomnia may lead to adverse pregnancy outcomes. Although recommendations vary, nonpharmacologic therapy is preferred as an initial treatment of insomnia during pregnancy (BAP [McAllister-Williams 2017]; BAP [Wilson 2019]; Palagini 2022).

Data collection to monitor pregnancy and infant outcomes following exposure to flurazepam is ongoing. Encourage pregnant patients to enroll in the National Pregnancy Registry for Psychiatric Medications (1-866-961-2388).

Mechanism of Action

Long-acting benzodiazepine (Griffin 2013). Binds to stereospecific benzodiazepine receptors on the postsynaptic GABA neuron at several sites within the central nervous system, including the limbic system, reticular formation. Enhancement of the inhibitory effect of GABA on neuronal excitability results by increased neuronal membrane permeability to chloride ions. This shift in chloride ions results in hyperpolarization (a less excitable state) and stabilization. Benzodiazepine receptors and effects appear to be linked to the GABA-A receptors. Benzodiazepines do not bind to GABA-B receptors (Vinkers 2012).

Pharmacokinetics (Adult Data Unless Noted)

Absorption: Rapid.

Duration of action: Adults: Classified as a long-acting benzodiazepine; classification based on benzodiazepines with half-life >40 hours (Griffin 2013).

Distribution: Flurazepam: Vd: 3.4 L/kg; N-desalkylflurazepam: Vd: 0.7 L/kg (Vozeh 1988)

Protein binding: Flurazepam: ~97%; N-desalkylflurazepam: ~98% (Vozeh 1988)

Metabolism: Hepatic to N-desalkylflurazepam (active) and N-hydroxyethylflurazepam

Half-life elimination:

Flurazepam: 2.3 hours

N-desalkylflurazepam:

Adults: Single dose: 74 to 90 hours; Multiple doses: 111 to 113 hours

Elderly (61 to 85 years): Single dose: 120 to 160 hours; Multiple doses: 126 to 158 hours

Time to peak, serum:

Flurazepam: 30 to 60 minutes

N-desalkylflurazepam: 10.6 hours (range: 7.6 to 13.6 hours) (Greenblatt 1989)

N-hydroxyethylflurazepam: ~1 hour (Greenblatt, 1989)

Excretion: Urine: N-hydroxyethylflurazepam (22% to 55%); N-desalkylflurazepam (<1%)

Brand Names: International
International Brand Names by Country
For country code abbreviations (show table)

  • (AR) Argentina: Somlan;
  • (BD) Bangladesh: Aluctin | Florapam;
  • (CH) Switzerland: Dalmadorm;
  • (CN) China: Dalmadorm | Flurazepam | Flurazepam monohydrochloride;
  • (ES) Spain: Dormodor;
  • (GB) United Kingdom: Dalmane | Felmane | Flurazepam | Paxane;
  • (HK) Hong Kong: Dalmadorm;
  • (HR) Croatia: Fluzepam;
  • (ID) Indonesia: Dalmadorm;
  • (IE) Ireland: Dalmane | Dalmapam;
  • (IN) India: Fluracap | Fluraz;
  • (IT) Italy: Dalmadorm | Felison | Flunox | Remdue | Valdorm;
  • (JP) Japan: Benozil | Dalmate | Insumin | Nergart;
  • (LU) Luxembourg: Staurodorm;
  • (MY) Malaysia: Apo flurazepam;
  • (NL) Netherlands: Dalmadorm | Flurazepam | Flurazepam hcl flx;
  • (PH) Philippines: Dalmane;
  • (PR) Puerto Rico: Dalmane | Flurazepam HCL;
  • (PT) Portugal: Dalmadorm | Morfex;
  • (SG) Singapore: Apo flurazepam | Dalmadorm;
  • (SI) Slovenia: Fluzepam;
  • (SR) Suriname: Apo flurazepam | Flurazepam;
  • (TH) Thailand: Dalmadorm;
  • (TW) Taiwan: Dalmadorm | Dalpam | Flunox | Lisumen | Lozepam | Manlsun | Panmomel | Remdue | Syndoman | Vensi;
  • (UY) Uruguay: Dalmadorm;
  • (VE) Venezuela, Bolivarian Republic of: Fluralema;
  • (ZA) South Africa: Dalmadorm
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