muscle spasm
"I have been dealing with an injured hamstring for 9 months and the orthopedic docs have not been able to provide relief. Muscle spasms got so bad I ended up in the ER. ER doc gave me this medication and within 45 minutes the spasms stopped. I take 500 mg 3 times a day.  For me this is like a miracle. There are no words to tell you how much better I feel.   I have no side effects but I usually don't have any issues with medication."