Phenoleptil
First- or second-line antiepileptic for idiopathic epilepsy. Phenobarbital is a controlled drug (Schedule 3) - written prescription mandatory. Active ingredient: phenobarbital.
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Based on a 15 kg dog, recommended strength: 12.5 mg. Assumes 12 months of continuous use (chronic dosing) and one written prescription per year. CMA Order caps the prescription fee at £21 for the first medicine, plus £12.50 per additional medicine on the same prescription. Prices are indicative and last verified 2026-05-15. Always confirm the current price on the pharmacy site before purchase.
Why it costs more at the vet
Le Vet-branded phenobarbital; the human generic is extremely cheap and the saving compounds across the dog's lifetime.
Common side effects
- Sedation (early)
- Polyphagia
- Hepatic enzyme elevation
Not a complete list. Always read the patient information leaflet and speak to your vet about side effects.
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How to get a written prescription
The CMA Order is legally binding by 23 September 2026. Every UK vet must offer a written prescription on request, with the fee capped at £21 for the first medicine plus £12.5 per additional medicine on the same prescription. Take the prescription to any VMD-approved online pharmacy listed above.
Common questions
- Why is Phenoleptil a controlled drug?
- Phenobarbital is a barbiturate with abuse potential in humans. Vets must dispense and document carefully.
- What blood tests does my dog need?
- Phenobarbital serum level after 2-3 weeks, then every 6-12 months. Liver function every 6 months.
Similar medications
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Same medicine, same regulator, same vet relationship — half the price. Five-minute switch from in-clinic dispensing to a VMD-approved online pharmacy.
Pricing data status: indicative. Last verified 2026-05-15. Pharmacies change prices regularly — always confirm before purchase. Not medical advice.