muscle spasm
"My doctor prescribed 10 mg flexeril 3 times per day for a painful and crippling muscle spasm in my lower back. The dosage helped relax my back, but it also relaxed everything else in my body. I had difficulty controlling my extremities, as if they were detached from the rest of my body. Sometimes I didn't have enough control of my tongue to speak clearly. Sometimes I felt weak and uncoordinated, for example, I had to take my time going up and down stairs. I felt generally sleepy and spaced out most of the time, and felt thirstier than usual. I also needed more sleep than usual, 10  hours. Overall effective for helping my condition, but the side effects were a little frightening."