Soma Dol T 450 Use To acute Muscle pain. We got it! Soma dol t 450 (carisoprodol 350 mg and tapentadol 100 mg) is used to treat moderate to severe pain. Carisoprodol is effective for muscle relaxation and spasms. Tapentadol is a potent opioid analgesic. The combination of Soma and tylenol for muscle relaxation and pain relief enhances the effects of the combination.