A vet prescription is required for the medicine you have chosen prac tic is for the treatment and prevention of infestations with fleas and ticks kills fleas before they lay eggs if you do not yet have a prescription then you can print out the following blank veterinary prescription form which you can ask your vet to fill in when you next visit please note that changes to legislation in 2005 means that vets must offer you a prescription to take away and not just supply you the medicines d