I want to go on holiday to thailand.can i take my prescribed drug phseptone through customs?

You should have no problems, but to be on the safe side you can email the Ministry of Public Health ( Narcotics Control Division ) Tiwanan Road, Nonthaburi. 66 2 590 7332 email narcotic@fda.moph.go.th .

what you should do is email me if you know the name of your medicine and i'll tell the thai name of that medicine ok and go to a clinic in thailand and ask them for that medicine in thai.