Hey all been trying Ainterol PM (500mg) once per day to start, but after about four days, I start to get a sore/stiff neck, and a mild headache, has anyone run into this? I tried searching the forums and found vague mentions but no thread with a definite mention.

Thanks 

Headache sounds normal, neck pain I have not heard of , though there easily related and may be too soon for PM to be the cause