You have to make sure it is prescribed by your caregiver. Fansidar is usually prescribed twice in one pregnant, the first dose as soon as you feel your baby's movement (between 16-22weeks); then second dose a month after. You can take it in the second trimester but not safe in the third trimester after 34 weeks cause of the risk of your baby having jaundice. If you have malaria symptoms, see your care provider. They know the best drug of choice to prescribe depending on ur weeks of gestation. Besides, Fansidar is only meant for preventing malaria not for treating it. All the best to you!