Carisoprodol (Meprobamate) Carisoprodol is a centrally-acting skeletal muscle relaxant whose active metabolite is meprobamate. Carisoprodol is marketed in the United States under the brand name Soma, and in the United Kingdom and other countries under the brand names Sanoma and Carisoma. The effects observed after consuming carisoprodol include dizziness, drowsiness, sedation, confusion, disorientation, slowed thinking, lack of comprehension, drunken behavior, obtunded, coma. In the DUI context relating to field sobriety testing, horizontal gaze nystagmus, vertical gaze nystagmus (in high doses) and lack of convergence are present. Pupil size is normal to dilated and reaction to light is slow. Pulse rate, blood pressure, and body temperature are normal to lower. Other characteristic indicators may include slurred speech, drowsiness, disorientation, drunken behavior without the odor of alcohol, and generally poor performance on field sobriety tests.