
Adverse events were more frequent with lamotrigine than placebo, with rash in 1 person in 27. Lamotrigine did not help the pain, and was no different from placebo except in causing more side effects. Almost half of the 1511 people in the studies had painful limbs because of damaged nerves caused by diabetes, and seven different painful neuropathic conditions were examined. We found 12 studies of reasonable quality that tested lamotrigine against placebo for a number of weeks. On 26 November 2013 we performed searches to look for clinical trials where lamotrigine was used to treat neuropathic pain or fibromyalgia. Lamotrigine is a medicine used to treat epilepsy, and so might be a useful medicine for neuropathic pain or fibromyalgia. Our understanding of fibromyalgia (a condition of persistent, widespread pain and tenderness, sleep problems, and fatigue) is lacking, but fibromyalgia can respond to the same medicines as neuropathic pain. Medicines like paracetamol or ibuprofen are not effective in neuropathic pain, while medicines that are sometimes used to treat depression or epilepsy can be very effective in some people with neuropathic pain. Neuropathic pain is treated by different medicines than pain from damaged tissue. It is different from pain messages carried along healthy nerves from damaged tissue (a fall, or cut, or arthritic knee). Neuropathic pain is pain coming from damaged nerves.
