I do recall that it took at least a couple of weeks to begin to lessen the neck pain. On the other hand, the drowsiness kicked in the very first time I took the stuff. I was an early riser for work...
I used it for chronic neck pain for 3+ years- worked great, except for a few side effects. I gained about 7-8 lbs., was sun-sensitive, drowsy in the evening (not so bad though) and a little groggy in...