ATTENTION HOUSE. For Malaria Treatment in pregnancy. 1.If your prenancy is less than 13 weeks (ie within the first trimester) and you've been diagnosed to have malaria, your doctor will prescribe Tab chloroquine 4-4-2 to be taken alongside Tab piriton to prevent body itching. 2.If your pregnancy is more than 13 weeks and you've been diagnosed to have malaria, your doctor will prescribe Tab lonart D/s for you. Reason is because tab lonart is not safe in the first trimester (ie first 13 weeks of pregnancy) as it will adversely affect the developing baby but it's safe afterwards.