I reacted the same way to both drugs. I take Flexeril occasionally for muscle spasms and it is helpful. I was perscribed 10mg and it knocks me out. I started cutting it in half and can tolerate it better. Since you are not having muscle spasms, you may want to call the doctor's office and ask them to explain their choice of the Flexeril. The only thing I can think of is for sleep but I am not a MD.