Hi Aussie, i found the best one for me were Tramadol Slow Release, initialy my doc had me on 1 x 200 mg + 1 x 100 mg taken twice a day [600 mg] as they last for 12hours, apparently here and the US the normal limit is only 200 mg x 2 a day [400 mg] but i guess i was lucky with my doc.

http://www.nlm.nih.gov/medlineplus/d...r/a695011.html

Like all drugs there is possible side affects, depends on the individual but I had none of the side affects mentioned above though from Tramadol SR , no brain fog, i was able to still loose weight on them, nothing at all noticeable to me.
I think you can also get them in 50 mg tabs but they only last i think for about 4 hours, if your interested your doc may have some sample packs to try before you buy.
My local doc was getting " government authority " to write out scripts for " 3 packs " for the price of one.
Brian