Objectives: Lamotrigine (LTG) is a drug commonly used to treat epilepsy and can also be used to manage mood disorders, such as bipolar disorder. One of the most dangerous adverse effects of LTG is skin rash, which can make early cessation necessary. Here, we examine the adverse effects associated with long-term use of LTG for the treatment of mood disorders.
Methods: Data were obtained from the medical records of 101 psychiatric patients who were prescribed long-term treatment with LTG. Patients were retrospectively divided into those who discontinued treatment within 6 months and those who continued for longer, and the groups were compared for adverse effects. We also compared the incidence of adverse effects in high and low doses.
Results: Fifty-four patients continued LTG treatment for 6 months or longer; 47 discontinued within 6 months. A history of allergy was more prevalent among the patients who discontinued treatment early than in those who continued. Of the patients who continued treatment for 6 months or longer, only 2 later discontinued treatment because of adverse effects. Lamotrigine monotherapy showed no difference in the incidence of adverse effects for different doses of LTG (>200 mg = 4.8% vs >100 mg, ≤200 mg = 7.7%; P = 1, vs >50 mg, ≤100 mg = 0%; P = 1 vs ≤50 mg = 0%; P = 1).
Conclusions: Clinicians must be mindful of the adverse effects occurring early during the titration phase. However, long-term use of LTG was very well tolerated, even at high maintenance doses.
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