You should look at official guidance to make sure you don't have any issue. This is one area which has significant risk so I wouldn't rely on anonymous advice from an internet forum. Do the research and come to your own decision.

This is from the Thai embassy in USA : https://thaiembdc.org/bring-medication-into-thailand/

Seems from their information that a permit is required for some prescription medication types, and you must declare when entering.
https://permitfortraveler.fda.moph.g...heckdrug_index