I always include the Pill when asked to list medications. Mind you when I had an occ health appointment I also told them about the shoulder injury I got 9 years ago that won't affect my new job. My policy is to give them all the information and let them decide what's relevant.
I would include it.
It doesn't really matter why you are taking it. The fact is that it is a medication that you are taking.
It is always better to include it and for them to ignore it if necessary than to withhold information.
It's a prescribed medicine so yeah. You only have to include any form of tablets or medicine that you take with you incase you get rushed to hospital or whatever and the doctors know what tablets etc you might have taken in the last few hours cos that could affect what treatment they can give you although TBH I don't see how a pill would affect that, but you're better safe than sorry.