Lorazepam
"I have the late effects of polio (PPS) w/ SEVERE muscle spasms - am NOT anxious about anything (seems lorazepam is used more for anxiety).  My spasms draw toes calves thighs hands back muscles into knots & wake me up screaming w/ pain. My dose of 1- 0.5mg tab only gives no side effects, but it just doesn't work long enough, or isn't strong enough or, need to take more than twice/day; perhaps higher dosage, more frequent dose or different drug altogether wld work better or provide better relief"