Pet insurance - paying towards meds

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We have been told our old cat needs to start regular blood pressure medication, but the vet said not to worry as we are insured and they will liaise directly with the insurers to recoup the medication costs. We would just need to pay the excess.
I have just checked our policy however and it says “The excess is the amount you pay towards a claim. There is no excess on any sections of cover except Vet's Fees where it is £150 plus 25% of the remaining fees.”
So does that mean we will have to pay 25% towards the medication? Does anyone know how that would work?
I don’t know the cost yet but I have heard that medication can be bought more cheaply if not through the vet, so is that worth exploring? Just wondered how that would work if the vets are saying they’ll liaise directly with insurance.
Thanks for reading and for any advice you might have.

With older pets a percentage contribution is not uncommon. So each year you will need your pay £150 plus 25% of all costs to the vets to cover your part of medications, consults and investigations/monitoring.
To buy medication on line you would need a written prescription from your vet which they charge for. You can search the medication on line for costs to know the pharmacy is regulated and medicines are genuine you need to check for the VMD logo.
Some insurance companies will pay for prescriptions and medications bought on line ( minus your percentage) so that is worth checking with them,

I get the medication online with a prescription from the vet, it's cheaper than the co pay and bumping up premiums.