If you are planning a trip to BKK for the first time, Here's a tip.
DO NOT BUY MEDS ON THE STREET.
Amongst your travels you will be offered everthing under the sun, Cialis, Viagara, Valium, along with a whole variety of "all natural" remedies intended on helping with "stamina".
I repeat, Do not waste your money.
While checking out some headache meds in a pharmacy, I asked the girl about Valium. She informed me that the only place to get ahold of it is through the Hospital.
So, there you go.