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* This combination of drugs may have possible synergistic effects. However, the pharmacokinetic drug interactions will influence the plasma levels.
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* Carbamazepine can reduce lamotrigine serum concentration considerably. Add lamotrigine according to the general dosing advice. <ref name=”freeman”> {{Pubmed|9433333|Freeman et al. Mood stabilizer Combinations: A Review of Safety and Efficacy. Am J Psychiatry 1998;155:12-21}}</ref> <ref name=”bazire”> {{[Bazire S, Pshychotropic Drug Directory 2007, HealthComm UK Limited, Aberdeen, 2007.}}]</ref>
* Lamotrigine may increase levels of carbamazepine metabolites. <ref name=”freeman”> {{Pubmed|9433333|Freeman et al. Mood stabilizer Combinations: A Review of Safety and Efficacy. Am J Psychiatry 1998;155:12-21}}</ref> <ref name=”bazire”> {{Bazire S, Pshychotropic Drug Directory 2007, HealthComm UK Limited, Aberdeen, 2007.}}</ref>
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* Abrupt stop of carbamazepine can cause serious lamotrigine rash as lamotrigine levels increase. <ref name="Koch"> {{Pubmed|12648898|Koch HJ et al. Clinically relevant reduction of lamotrigine concentrations by carbamazepine. J Clin Psychiatry 2005;66:400-1}}</ref>
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