Pregalin 50 mg is used to treat chronic pain brought on by spinal cord injury, shingles, or diabetes-related nerve damage. It lessens pain as well as the negative side effects that go along with it, such as fatigue, mood swings, and difficulty sleeping. It is believed to function by obstructing the brain's ability to receive pain signals from the injured nerves. Even if you believe it isn't working, you must continue taking it because it takes a few weeks for it to take effect.