Last I heard the only one the UK CAA approved of was something called Zimmovane, which contains Zopiclone, (known as Imovane in Australia and Canada). Tamazapam has too longer half life, i.e. stays in the system too long.
Thailand introduced laws back in the early nineties banning the sale of prescription drugs over the counter, be very careful, what they started selling, at twice the price, were locally made, often from chalk or talcum powder!