How should I taper off Valium (diazepam)?

Very long parent and active-metabolite half-lives (desmethyldiazepam 36–200 hours) make diazepam the preferred target for benzodiazepine crossover tapers. Tablets are easily split; oral solution (5 mg/5 mL) and concentrate (5 mg/mL Intensol) support fine titration. Diazepam is the reference benzodiazepine in Ashton-protocol tapering due to long half-life, multiple strengths, and available liquid formulations. Apply ~10% proportional reductions every 2–4 weeks for chronic users.

Valium Tapering Guide

Q: What are the withdrawal symptoms of Valium (diazepam)?

Common withdrawal symptoms of Valium (diazepam) include: anxiety, insomnia, muscle tension, sensory sensitivity, depersonalization. Symptom severity varies by individual, dose, and duration of use.

diazepam

BenzodiazepineFDA 1963

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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.

Common Doses

2mg, 5mg, 10mg

Formulations

Tablets: 2mg, 5mg, 10mg; Oral solution: 5mg/5mL; Oral concentrate (Intensol): 5mg/mL; Injection: 5mg/mL; Rectal gel (Diastat): 2.5mg, 10mg, 20mg

Pregnancy

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 parent and active-metabolite half-lives (desmethyldiazepam 36–200 hours) make diazepam the preferred target for benzodiazepine crossover tapers. Tablets are easily split; oral solution (5 mg/5 mL) and concentrate (5 mg/mL Intensol) support fine titration.

Maudsley Deprescribing Guidance

Diazepam is the reference benzodiazepine in Ashton-protocol tapering due to long half-life, multiple strengths, and available liquid formulations. Apply ~10% proportional reductions every 2–4 weeks for chronic users.

Common Withdrawal Symptoms

anxietyinsomniamuscle tensionsensory sensitivitydepersonalization

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

Absorption

Rapidly and completely absorbed after oral administration. Bioavailability ~100%. Tmax 0.5–2 hours. Food may delay absorption.

Distribution

~0.8–1.0 L/kg

Metabolism

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.

Elimination

Renal (primarily as glucuronide conjugates of metabolites). Very little unchanged diazepam in urine.

Protein Binding

~98%

Clearance

~20–30 mL/min (total body clearance)

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