Though Lyrica is classified as an anticonvulsant, it is used for purposes beyond treating seizures. Lyrica works by altering pain signals in the nervous system while also slowing down the impulses that cause seizures. Neuropathy, an abnormal or degenerative state within the nervous system, is generally the root cause of many of the conditions that Lyrica treats. Lyrica (pregabalin) is a medication used to control seizures and to treat fibromyalgia. It may also be used to treat pains caused by nerve damage in diabetic patients. Some of the condition that Lyrica can treat are post-herpetic neuralgia, diabetic neuropathy or neuropathic (spinal cord injury). Lyrica works by affecting the natural substance in the brain that to change how the body reacts to the pain. By doing this, it will be able to control seizure and any pain caused by nerve damages. Lyrica is available in tablets or liquid, and its mode of administration should be oral. The common side effects associated with this drug are drowsiness, constipation, swollen legs and weight gain. If any of them persist, seek immediate medical attention.