What are your water parameters. They can flick due to poor water conditions too. Have you done a water change after completing the full dosage of medication?
Try some melafix (or similar). I've been treating my tank for white spot for 4 days and the fish are really showing stress (clamped fins and flicking), the guy at the LFS recommened melafix to help replace the slime coating the meds had stripped from my fish, in less than 10 minutes almost all fish were acting normal, then they went backwards a bit, after the initial relief is my guess but they are well on the way to normal
Sorry never heard of Liquisil General Tonic (just did a quick search, general bad bug thing killer) before, fish maybe a little more aggrivated but get some melafix or slimecoat in there soon and it should help them heaps, also try a 25% water change this will also help to get rid of any nasty chemicals to lower levels