Massive trade in "Diet pills" in da Phills the missus had pills she took as did many of her mates (they were all trainee nurses as well!!) Which supressed the need to eat. I had to advise her not to bring over but she found some in her make up bag thankfully we were not searched on the way inAs who knows...
If i recall I think she and her friends were mildly addicted to when they gave up.. So who knows what were in them
I think some may contain even more potent "chemicals and Drugs" I'd be very careful importing into the UK may attract the attention of Customs and Excise..
Also be careful of transit countries I know in Dubai Codeine is ilegal I think it is even if prescribed to you in another country.. I would not be surprised if other medicines are also in the same bracket..