I know "everyone" knows this so I mean the reminder only for those that forget.
Under absolutely no circumstances buy travel insurance cover without informing the insurers in writing (and receiving written confirmation of acceptance) of all current and previous medications you are and have received and any topic on which you have consulted a doctor.
Which of course is one of the un-mentioned major benefits of the plat insurance, they don't require any such medical history and therefore don't have inflated premiums for common things like blood pressure.
Prior to plat, I used insured and go, and their front line premium would increase by 30-40% when told about my BP issues med.