The fact that US glider pilots don't need a medical certificate
doesn't seem to alter the applicability of the FAA drugs list. Ref
61.53 and 91.17.

You can drive whilst using all the medications the OP mentioned, if you
judge that they do not make you feel dizzy or drowsy.

I can see why the barriers are set higher for powered aircraft than for
drivers - I'm not sure that it follows that they should be set equally
high for glider pilots. For example, gliders tend to fly further from
major airports and over less populated terrain.

In contrast it's pretty easy to take out 5 people if you mess up whilst
driving.

Just speculating - I don't suppose it makes any difference in the eyes of
the law.

vne