300 mg of Nervismart A capsule is a medication used to treat neuropathic pain, which is pain brought on by damage to the nerves as a result of spinal cord injury, diabetes, shingles (herpes zoster infection), or other illnesses. 300 mg of Nervismart Fibromyalgia sufferers may also utilize capsules to relieve their discomfort. It lessens discomfort as well as the mood swings, sleep issues, and fatigue that the pain may bring on. It disrupts the brain's ability to process pain signals. Until your doctor tells you to stop taking the medication, continue taking it.