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To clarify, online vets cannot issue prescriptions or prescription medicine.
You'd need to ask their vet directly.
Alternatively, if you wish to avoid a vet visit, you can use an effective OTC spot in such as Advantage. This product uses the same active ingredient as Advocate (Imidacloprid) and is very effective.
How does this sound?
I do hope this has helped and please let me know if you have any further questions,