Doxylamine+Vitamin B6 (Pyridoxine)+Folic Acid is used to prevent nausea and vomiting in pregnancy. Doxylamine + Vitamin B6 (Pyridoxine) + Folic Acid is a combination of three medicines: doxylamine, vitamin B6 (pyridoxine) and folic acid, which treats nausea and vomiting associated with pregnancy.