Can I legally use an unauthorised veterinary medicinal product in my horse, for example, a product authorised in Ireland or another member state but not in the UK?
Yes, if a veterinary surgeon has decided that the use of such medicinal product is appropriate under the rules of the cascade for animal welfare reasons, he/she can prescribe the medicine to that particular animal. In this case the medicine may be legally imported into the UK through the VMD’s import scheme. Details on how to use the scheme may be found here: http://www.vmd.defra.gov.uk/pdf/vmgn/vmgnote13.pdf
You will be asked for your informed consent under these circumstances.