Please consult with a Vet on drug interactions.

We are a distributor so in these cases we advise to consult a veterinarian. We have found that Advantage Purple and Advantage Green is often used on rabbits and guinea pigs. http://goo.gl/5gQOKL

As your cat is borderline you may like to continue to use what you have and monitor closely to see if it is effective. However we are not vets and would strongly recommend you seeks vets advice if you are unsure.

We are an international distributor based in London England and most of the products on our site are over the counter where we ship from so no, we do not require a prescription.

All products are well within expiry dates. Generally the items are manufactured about six months ago with a three year lifetime, so on average you have about 2.5 years before the expiry date is reached. http://www.tickcollarz.com/g/1228658/quality-guarantee.html