when going for clinical trial, they are specially concern for
your health status. I do not know what type of trial you are
undergoing, but if you feel unfeel, you have to tell them
immediately. They will even note your complain down into their data
as part of the trial result.
because you will not know what they want from the test(placebo or
double-blind), so just keep them inform of anything which you dont
feel good or right...there is no harm, and they will appreciate
your contributions..dont worry about it..
weijian: such trials, are paid, and i think they are paid quite
well...personally, i have no such experience, but i am from
research area, so i know abit here and there....Normally, they will
put up a notice in the newspapers, seeking for healthy males or
females between whatever age, and their requirements...
just keep a lookout in the papers...