🧪 Neurology / Anaesthesia

Diazepam Dog Dosage Calculator

Weight-based diazepam dosing for canine seizure emergencies, anxiety, muscle relaxation, and pre-anaesthetic use — with route-specific guidance.

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Prescription Medication: Diazepam is a Schedule IV controlled substance. It must be prescribed and supervised by a licensed veterinarian. This calculator is for educational reference and emergency-preparedness planning only. IV diazepam administration must be performed by trained veterinary personnel.

🐶 Introduction

Diazepam (Valium®) is a benzodiazepine that enhances inhibitory GABA-A receptor activity in the central nervous system, producing dose-dependent sedation, anxiolysis, muscle relaxation, and anticonvulsant effects. In veterinary practice, it is a cornerstone of emergency seizure management and is used as a premedication agent prior to general anaesthesia.

In dogs, diazepam has a rapid onset when given intravenously (30–60 seconds) and a half-life of 2.5–3.2 hours, with active metabolites (desmethyldiazepam) extending clinical effect. Rectal administration provides a practical route in home-care settings for epileptic dogs.

📚 Indications & Dose Ranges

1. Seizure Emergencies (Status Epilepticus / Cluster Seizures)

  • IV (preferred, clinic): 0.5–1.0 mg/kg IV slowly (over 2–3 min); may repeat ×2 at 10-min intervals
  • Rectal (home/transport): 1.0–2.0 mg/kg per rectum; onset 10–15 min
  • Intranasal: 0.5 mg/kg IN (off-label; absorption variable)

2. Pre-anaesthetic / Sedation

  • IV/IM: 0.1–0.25 mg/kg, combined with an opioid (e.g., butorphanol) or ketamine
  • Often dosed as a fixed combination (e.g., diazepam 0.2 mg/kg + ketamine 5–10 mg/kg IV)

3. Anxiety & Muscle Relaxation

  • Oral: 0.5–2.2 mg/kg PO q8–24h (highly variable; titrate to effect)
  • IV/IM for muscle spasm: 0.25–0.5 mg/kg IV or IM

Available Concentration (Injection)

Standard: 5 mg/mL in propylene glycol/ethanol vehicle. Must be administered slowly IV to avoid hypotension and cardiac depression. Do not mix with other solutions.

📋 How to Use

  1. Enter your dog’s body weight (kg or lb).
  2. Select the indication — seizure emergency, pre-anaesthetic, or anxiety/muscle relaxant.
  3. Select the administration route.
  4. Click Calculate — results show dose in mg, injection volume in mL, and rate guidance.

🧪 Diazepam Dose Calculator




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Administration notes: IV diazepam must be given slowly (≤5 mg/min) to avoid respiratory depression, apnoea, and cardiovascular collapse. Have atipamezole and reversal agents available. Do not leave a seizing dog unattended. If seizure does not stop after 2 doses, escalate to phenobarbital or levetiracetam per your veterinarian’s protocol.

📖 References & Methodology

  1. Plumb DC. Plumb’s Veterinary Drug Handbook, 9th ed. Wiley-Blackwell, 2018. Diazepam entry.
  2. Podell M. Antiepileptic drug therapy and monitoring. Top Companion Anim Med. 2013;28(2):59-66.
  3. Muñana KR, et al. ACVIM consensus statement — treatment of epilepsy in dogs. J Vet Intern Med. 2015;29(3):738-748.
  4. Papich MG. Saunders Handbook of Veterinary Drugs, 4th ed. Elsevier, 2016.