Pregalin 50mg is a "anti-convulsant," which means it stops seizures. It is mostly used to treat neuropathic pain, epilepsy (seizure episodes), fibromyalgia (musculoskeletal pain), and neuralgia (pain from a broken or irritated nerve). Neuropathic pain is long-lasting nerve pain that is usually caused by nerve damage from diabetes, shingles (a painful virus that causes a rash), spinal cord injuries, and injuries to muscles, joints, or tissue.