Answer
Take it when remembered unless the next dose is nearly due; then omit it. Do not double the dose, and seek professional advice if protection may have been interrupted.
Sources for this answer
- Lariam 250 mg tablets / Mefloquine 250 mg tablets — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.