When people have asked I just casually say it's a medication side effect. No one has ever bothered to ask what med or why I take it. But I'm also very open about it. So if they did ask I wouldn't really have a problem explaining. Actually at yoga I did have to explain, or else they may have thought I wasn't healthy enough to be in the hot room. They were very kind and understanding about it.

If you just leave it at medication most people would accept that and not be so nosey as to inquire for more info. Or yes blame it on a different med.