01/11/2026
Why don’t vets use human medications?
Often vets will use medication for which there is a human equivalent or the exact same drug, formulated for human use. In some cases this is available over the counter for people without a prescription; so inevitably the question comes up now and again – why don’t vets use the human version if it is cheaper?
In equine practice there aren’t too many shared drugs (it’s more common when talking about dogs) but it does come up occasionally (paracetamol for example or even omeprazole).
The short answer is that it would be illegal for us to do so.
There are actually several layers of restrictions which are as frustrating to us as they are baffling to our clients.
1. The “cascade”. Vets are legally obliged to follow the prescribing cascade which means that if there is a formulation of a medication which has a veterinary licence we MUST prescribe that even if there is a much cheaper generic human version available.
2. Where vets are wishing to prescribe human licenced medication this cannot be obtained from a human medical wholesaler – only a veterinary one.
3. “Over the counter” medications are only legally to be bought for administration to people. So, it is illegal for a vet to suggest you buy over the counter medications to use on your horse and anyone selling it would inadvertently be breaking the law.