Once you start importing and get in good with your Vet, He/She should have a list of meds dosings for you to have on had, Thus saving you time and money.
I know my Vet which i havent used for reptiles yet, but he will write me any script i need and he will give me the dosage over the phone.
You will need to take your first batch of Imports in t know what you will be dealing with. Then stock up on the Meds depending on the number you import.