Kanske inte så roligt att bli stannad i tullen utan att kunne visa upp recept 
Inte bara i tullen utan också av Thai polis.
http://www.phuketgaz...ail.asp?id=8252
Från artiklen:
According to Thailand’s Psychotropic Substances Act of 1974,
possession of a ‘schedule IV’ drug such as diazepam without a prescription
is illegal and punishable by up to one year in prison, a fine of 20,000 baht, or both.
But despite the law, drugs such as diazepam and alprazolam (trade name Xanax)
are widely available at pharmacies in tourist centers such as Patong – with the tacit acceptance of some local authorities.
Fager.