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Anti-epileptic

Phenoleptil

First- or second-line antiepileptic for idiopathic epilepsy. Phenobarbital is a controlled drug (Schedule 3) - written prescription mandatory. Active ingredient: phenobarbital.

£39.00,£57.00
Typical UK vet price per month
CMA / VetHelpDirect
£0.19
Cheapest VMD-approved online (monthly)
Last verified 2026-05-15
£553.00
Annual saving (net of £21 prescription fee)
Indicative, 15 kg dog

Key takeaways

  • Phenoleptil treats first- or second-line antiepileptic for idiopathic epilepsy. phenobarbital is a controlled drug (schedule 3) - written prescription mandatory
  • Typical UK vet price £39 to £57 per month, based on observed dispensary list pricing across UK practices.
  • Cheapest VMD-approved online from around £0.19 per month, versus £0.28 at the upper end of the same six pharmacies.
  • Prescription works the same way, ask your vet for a written Phenoleptil prescription (capped at £21), dispense online.
  • Main side effect to watch for: sedation (early), review the full list with your prescribing vet before starting or changing dose.

Live verified pricing

Just checkedLast refreshed 17 May 2026

We checked the pharmacy product page directly. Prices below are the actual per-unit list price for the variant linked, confirm on the pharmacy site before buying.

See your saving over a year

Pick your dog's weight (and optionally your vet's actual quote) to see the exact monthly and annual saving. The price comparison table below sorts pharmacies by cheapest first; we never sort by commission.

Typical vet price
£39.00,£57.00/mo
indicative UK range
Cheapest online
no data
Annual saving
,
after £21 prescription fee: £0.00,£0.00

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.

No online price data yet for Phenoleptil at this strength. We are building the database, check back soon.

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.

Read the full prescription guide →

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.

Track Phenoleptil price drops

We'll email when Phenoleptil drops in price at any of the pharmacies above.

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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.

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Pricing data status: indicative. Last verified 2026-05-15. Pharmacies change prices regularly, always confirm before purchase. Not medical advice.