Lariam 250mg Tablets contain mefloquine, an antimalarial medicine used to prevent malaria in high-risk areas. It works by interfering with the growth and reproduction of the malaria parasite inside red blood cells, stopping the infection from developing.

Lariam is typically taken once a week, starting before travel and continuing after leaving the malaria area. It is suitable for adults and children over a certain weight, with dosage tailored by a healthcare professional.