Chemoprevention is the use of medicines, either alone or in combination, to prevent malaria infection and its consequences. This publication provides standardized approaches for monitoring and evaluating the efficacy of medicines used for intermittent preventive treatment of malaria in pregnancy, perennial malaria chemoprevention (formerly known as intermittent preventive treatment of malaria in infants), seasonal malaria chemoprevention and intermittent preventive treatment of malaria in school-aged children. It follows the recent release of new and updated WHO recommendations on these interventions.