When Nervigesic 150 is used at higher than recommended dosages, it often produces uncommon side effects. If you are hooked to the medicine, you most likely began doing so within the first month since the tolerance for this drug develops quickly. The nervigesic 150mg is a pain reliever used to treat nerve damage (neuralgia) caused by diabetes, shingles (herpes zoster), spinal cord injury, and other ailments. It's also used to treat fibromyalgia patients' generalised muscular pain and stiffness.