Your Legal Right to a Written Prescription (And What It Saves You)

What the CMA actually decided

On 24 March 2026 the Competition and Markets Authority published the final report of a two-and-a-half year investigation into the UK veterinary market. It is not a gentle document. The CMA found systemic problems with price transparency, inflated prescription fees and ownership that pet owners could not see — and put the cost to consumers at roughly £1.7 billion over five years.

One number explains why the investigation happened at all: between 2016 and 2023, veterinary prices rose 63%. That is roughly twice the rate of inflation over the same period. Wages did not do that. Pet insurance did not absorb it. The difference came out of ordinary households, one invoice at a time.

The part that changes your monthly bill

Among fifteen remedies, one lands directly in your pocket. The fee a practice can charge for writing a prescription is being capped:

• £21 for the first medicine
• £12.50 for each additional medicine on the same prescription

Some practices had been charging £40 or more — which, conveniently, was often just enough to make asking for a prescription feel pointless. That was the problem. A fee set high enough to cancel out the saving is not a fee; it is a gate.

You always had the right. Most people never used it.

Under the RCVS Code of Professional Conduct, a UK vet must provide a written prescription on request rather than insisting you buy the medicine from them. This is not a favour and it is not a grey area. Asking for one is not rude, it does not signal distrust, and it will not affect how your animal is treated.

The reason so few owners ask is simpler than it looks: nobody tells them. The prescription is rarely offered. The medicine is handed over at the desk with the bill, the moment passes, and the same thing happens again next month for the next three years.

The maths: when it is worth asking

The calculation has three numbers, and you can do it on your phone at the reception desk.

1. What the practice charges for the medicine over the period the prescription covers.
2. What an online pharmacy charges for the same medicine, same strength, same quantity.
3. The prescription fee.

If (1 − 2) is bigger than (3), you are better off with the prescription. For a one-off course of antibiotics, it often is not worth it. For anything your animal takes every day for the rest of its life — heart medication, thyroid, epilepsy, Cushing's, skin allergy — it usually is, and by a margin that compounds every month.

A prescription typically covers repeat dispensing for a period, so one fee can cover several months of medicine. That single detail is what moves most long-term cases firmly into "worth it".

How to ask

There is no special form of words, but something plain and unembarrassed works best. At the end of the consultation:

Ask for the fee in the same breath. It stops the conversation needing a second round, and it tells you immediately whether the saving is real for your animal's particular medicine.

If you are already on a repeat medication and have never asked, you do not need to wait for the next consultation — phone the practice and ask what their process is for a repeat prescription.

What else the CMA is making practices do

The prescription cap is the headline, but three other remedies are worth knowing, because they change what you are entitled to see:

• A written estimate in advance for any treatment expected to cost £500 or more, plus an itemised bill for everything.
• Clear disclosure of ownership — practices must say whether they are independent or part of a group. A great many surgeries that look independent are not, and pricing tends to be set above the individual practice.
• A transparent complaints process, with mediation where a dispute cannot be settled in-house.

The RCVS will monitor compliance with these orders, funded by a new levy on the businesses themselves.

When a prescription is not the answer

Being honest about the limits is what makes the rest of this useful:

• Medicines given by injection at the practice — a monthly injectable is administered by the vet, so there is nothing for you to fill elsewhere.
• Anything urgent. If your animal needs treatment today, take the medicine today. Optimise the repeat, not the emergency.
• Short courses. A ten-day course rarely beats the fee.
• Very low-cost medicines, where the whole month costs less than the prescription fee.

Where to fill it

A UK online veterinary pharmacy will ask you to post the original written prescription, or will accept it from your vet directly. The medicine is the same medicine — same manufacturer, same box, same regulatory approval under the VMD. What differs is the margin.

Before you decide anything, get the two numbers side by side: what your practice charges, and what the same product costs online. That comparison is the entire point of this site.

The bottom line

The CMA spent two and a half years establishing something most pet owners already suspected: that they were paying more than they needed to, and that the system was not built to tell them so. The remedies help. But the single most effective thing you can do does not require waiting for December 2026, or for any regulator at all.

Ask for the prescription. Then check the price.