Valium Tapering Guide
diazepam
Boxed Warning
Concomitant use with opioids may result in profound sedation, respiratory depression, coma, and death. Risks of abuse, misuse, and addiction, which can lead to overdose and death. Physical dependence and life-threatening withdrawal reactions.
Overview
Diazepam is a long-acting benzodiazepine approved for anxiety disorders, alcohol withdrawal, muscle spasm, seizures, and as a pre-anesthetic. Due to its long half-life, multiple tablet strengths, and smooth pharmacokinetic profile, it is the preferred benzodiazepine for crossover tapers.
2mg, 5mg, 10mg
Tablets: 2mg, 5mg, 10mg; Oral solution: 5mg/5mL; Oral concentrate (Intensol): 5mg/mL; Injection: 5mg/mL; Rectal gel (Diastat): 2.5mg, 10mg, 20mg
Category D (positive evidence of risk)
Mechanism of Action
Positive allosteric modulator at GABA-A receptors. Enhances GABA-mediated chloride conductance producing anxiolytic, sedative, anticonvulsant, and muscle relaxant effects. Multiple active metabolites (desmethyldiazepam, temazepam, oxazepam) prolong its duration of action.
Taper Notes
Very long half-life — often used as the target drug for benzodiazepine crossover tapers. Tablets easily split. Liquid formulation available.
Hyperbolic Tapering Guidance
Preferred benzodiazepine for tapering due to long half-life and available small doses. Ashton Manual taper schedules use diazepam as the standard.
Summary written by TaperCommunity, informed by the Maudsley Deprescribing Guidelines (Horowitz & Taylor) and related literature — see Sources & References below. Not affiliated with or endorsed by the Maudsley.
Common Withdrawal Symptoms
Interactions & Safety
Drug Interactions
- Opioids — FDA boxed warning: concurrent use increases risk of profound sedation, respiratory depression, coma, and death
- CYP3A4 inhibitors (ketoconazole, fluvoxamine) increase diazepam levels
- CYP2C19 inhibitors (omeprazole, fluvoxamine) increase diazepam levels
Food Interactions
- Food may delay absorption but does not reduce bioavailability
- Avoid alcohol (additive CNS and respiratory depression, potentially fatal)
- Grapefruit juice may increase levels via CYP3A4 inhibition
Contraindications
- Acute narrow-angle glaucoma
- Myasthenia gravis
- Severe respiratory insufficiency
Toxicity
CNS and respiratory depression (especially with opioids/alcohol). Physical dependence with chronic use. Extremely long effective half-life due to active metabolites can lead to accumulation in elderly. Abrupt discontinuation can cause seizures.
Pharmacokinetics
ADME Profile
Rapidly and completely absorbed after oral administration. Bioavailability ~100%. Tmax 0.5–2 hours. Food may delay absorption.
~0.8–1.0 L/kg
Hepatic via CYP3A4 and CYP2C19 to the long-acting active metabolite desmethyldiazepam (half-life 36–200 hours), then to oxazepam, and via CYP3A4 to temazepam (both active). Final elimination via glucuronidation.
Renal (primarily as glucuronide conjugates of metabolites). Very little unchanged diazepam in urine.
~98%
~20–30 mL/min (total body clearance)
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Other Drug Profiles
Sources & References
Valium (diazepam) information on this page is sourced from peer-reviewed research, regulatory bodies, clinical guidelines, and patient-advocacy organizations.
Encyclopedic & chemical databases
Neutral, high-authority entity references.
Peer-reviewed research
Primary literature cited in this taper guide.
- Lader M 2014 — Benzodiazepine harm: how can it be reduced? (British Journal of Clinical Pharmacology)
- Ashton CH 2005 — The diagnosis and management of benzodiazepine dependence (Current Opinion in Psychiatry)
- Horowitz MA, Taylor D 2019 — Tapering of SSRI treatment to mitigate withdrawal symptoms (hyperbolic taper) (The Lancet Psychiatry)
Clinical guidelines
Evidence-based deprescribing and prescribing standards.
Deprescribing-specific resources
Clinician-facing references on tapering protocols.
- Ashton Manual (Prof. C. Heather Ashton) — Definitive clinical reference on benzodiazepine taper protocols
- British National Formulary (BNF) — UK formulary guidance on benzodiazepine prescribing
- Deprescribing.org — benzodiazepine algorithm — Evidence-based benzodiazepine deprescribing algorithm
Patient-advocacy & lived-experience
Long-running communities documenting withdrawal experience.
- BenzoBuddies — peer support forum — Largest peer-support community for benzodiazepine taper and withdrawal
- Benzodiazepine Information Coalition — Non-profit education on benzodiazepine dependence and withdrawal
- Inner Compass Initiative — Withdrawal Project — Peer-led psychiatric drug withdrawal resources
- Surviving Antidepressants — benzo & sleep med forum — Community archive of benzodiazepine taper experiences
TaperCommunity does not provide medical advice. Always consult a qualified prescriber before adjusting psychiatric medication.