I had this happen to me really bad this week. I was getting back spasms for 3 days when I thought about taking an allergy pill. Just store brand chloriphenirine maleate, and it started relieving the spasms. I took it every 4 hours, and it got better and better. When I would forget, the back spasms would start up. After about 3 days of the allergy meds, it is getting to the point where I don't get the spasms when I forget a pill. Saved me big time! I thought I was going to have to go to the hospital.