Royal College of Veterinary Surgeons guidance requires vets to be clear about what you are being charged for;

• To have on display in their surgeries the price of their top ten selling prescription-only veterinary medicines and a notice on their surgeries, which among other things, says: 'prescriptions are available from this practice, you may obtain relevant veterinary medicinal products from your veterinary surgeon OR ask for a prescription and obtain these medicines from another veterinary surgeon or pharmacy'. 

• Your veterinary surgeon may prescribe relevant veterinary medicinal products only following a clinical assessment of a animal under his or her care. 

• A prescription may not be appropriate if your animal is an in-patient or if immediate treatment is necessary. 

You can complain to the Royal College of Veterinary Surgeons if you believe its guidelines have been broken. 

There is a search facility on the Royal College of Veterinary Surgeons web site at www.findavet.org.uk vet in your area.