Zenflox Oz (ofloxacin and ornidazole) is not known to directly cause rapid climax. Instead, the underlying infection itself is the likely culprit. Infections can cause inflammation, irritation, and heightened sensitivity in the penis, which often leads to climaxing much quicker than usual. Anxiety about the infection can also play a major role. This is highly likely a temporary issue that will resolve as your body heals. Please complete your full medication course, and if the symptom persists after the infection has completely cleared, feel free to consult your doctor.