Figure 2From: Photostability studies on (±)-tramadol in a liquid formulation Plot of ln C vs time for the detection of (±)-tramadol in aqueous solution irradiated by UV-A, UV-B, and UV-C. A: (+)-tramadol in aqueous solution irradiated by UV-A (●), UV-B (○), and UV-C (□). B: (−)-tramadol in aqueous solution irradiated by UV-A (●), UV-B (○), and UV-C (□).Back to article page