There have been a number of posts over the past few months regarding the availability of Phenergan - the anti-emetic. Anyway, it is available over the counter at pharamcies in the UK- I bought some today. 56 *25mg tablets for about £4.70. They come in 12.5mg tablets too but I went for the strong ones! This is the stuff which seems to be prescribed as an anti-emetic in the US and used to counter post-operative n* andv*. From what I have read, one 25mg tablet is the standard anti-emet dosage.
I'mnot going to use them routinely obviously, but at least they're there - just incase!