The drug Pain O Soma 350 mg relaxes muscles. It is used to treat patients with painful joint conditions, such as stiffness or tightness, as well as unpleasant muscle spasms. Drug therapies can be helpful for pain that is not amenable to over-the-counter medication, such as pain following surgery or pain from a serious injury or unfortunate event. It functions by preventing chemical messages from being sent between nerves and the brain.