Side Effects of Lamictal (Lamotrigine)

Common Side Effects

• Mild to moderate transient nausea is one of the most frequently reported side effects when taking lamotrigine, as reported by the American College of Emergency Physicians 1, 2
• Dizziness, somnolence, and headache are commonly reported central nervous system effects, according to the American Diabetes Association 3, 4

Special Considerations

Drug Interactions

• Lamotrigine is metabolized by cytochrome P450, and strong inducers of this enzyme may decrease lamotrigine's efficacy, as noted by the American Academy of Dermatology 5

Administration Guidelines

• For patients with a history of lamotrigine use, a single oral load of 6.5 mg/kg can be considered if the patient has been on lamotrigine for >6 months without a history of rash and has been off the medication for <5 days, as recommended by the American College of Emergency Physicians 1, 2

Management of Lamotrigine‑Associated Headache

Symptomatic Pharmacologic Management

• Simple analgesics such as non‑steroidal anti‑inflammatory drugs (e.g., ibuprofen or naproxen sodium) can be used to relieve headache while continuing lamotrigine, and these agents have demonstrated efficacy for headache without affecting lamotrigine metabolism. 6, 7

Prevention of Medication‑Overuse Headache

• Limit the use of acute headache medications (including NSAIDs) to no more than 2 times per week to avoid medication‑overuse headache. 8

Criteria for Discontinuation of Lamotrigine

• Lamotrigine should be discontinued if the headache is severe and refractory to titration adjustment and symptomatic treatment. 8

Management of Lamotrigine‑Associated Headaches

First‑Line Symptomatic Treatment

• Simple analgesics such as NSAIDs (e.g., ibuprofen 400–800 mg every 6 h or naproxen sodium 275–550 mg every 2–6 h) can be used to relieve lamotrigine‑related headache while continuing the anticonvulsant, and these agents do not interfere with lamotrigine metabolism. 9

• The same recommendation is supported by an additional source from the same journal, reinforcing the safety of NSAIDs in this context. 10

Prevention of Medication‑Overuse Headache

• Acute headache medications, including NSAIDs, should be limited to no more than two doses per week to prevent medication‑overuse (rebound) headaches, which can lead to analgesic dependency and loss of efficacy. 9