I agree with
@DCUKMod , talk to your pharmacist about interactions or any concerns, they usually have far more knowledge then doctors on that subject. Doctors have a habit of not telling patients about side effects when prescribing medication/s in my experience. When you are taking a cocktail of things, the chances of interactions increases (Both known and unknown).
I have been prescribed medications that I should never of been given. I can't remember what it was called, this was over 10 years ago, but just as an example, what I was given contained cipro in it along with other things... I'm allergic to cipro and my notes have it listed and I was still prescribed this multi cocktail drug, but wasn't told it had cipro in it. This drug affects my Achilles tendons. The pain was horrendous, I couldn't walk for about a week and it took about a month to get back to normal. Just the slightest movement triggered off pain. It literally crippled me.
The point I'm making is that doctors are just like all of us, they make mistakes sometimes. Perfectly human thing to. I have since that event always googled for side effects and interactions whenever I have been prescribed something new. And of course, looked at the packet it comes in to see what's in it. You know, live and learn.
In your case I'm not saying something is wrong, but if it bothers you, talk to your pharmacist as already suggested.