Maximum Lamotrigine Dose
For adults with epilepsy using immediate-release lamotrigine, the maximum recommended maintenance dose is 400 mg/day (given in 2 divided doses). [1]
Dose Titration Before Reaching Maximum
For dosing influenced by concomitant medications that affect lamotrigine metabolism, the maintenance target and maximum maintenance dose depend on the presence of valproate versus enzyme-inducing drugs (eg, carbamazepine, phenytoin, phenobarbital, primidone) and other glucuronidation inducers (eg, rifampin). [1]
Dose Reduction Strategy When Coming Down From 300 mg
When lamotrigine is being reduced or discontinued, a step-wise reduction over at least 2 weeks is recommended. [2]
Example Taper From 300 mg/day (Approximately 50% Per Week)
An example consistent with “approximately 50% per week” is: [2]
- Week 1: reduce from 300 mg/day to approximately 150 mg/day. [2]
- Week 2: reduce from approximately 150 mg/day to approximately 75 mg/day, with further reduction or cessation determined by clinical response and safety considerations. [2]
Safety Constraint During Reduction
A lamotrigine reduction plan should follow the label-recommended approach, because a step-wise reduction over at least 2 weeks is recommended unless safety concerns require more rapid withdrawal. [2]
Dose Formulation Considerations
Lamotrigine tablets should be dosed according to available strengths and prescribed regimen. [1]