Doxylamine is not recommended for children under the age of 12, as its safety and effectiveness are not known, states Drugs.com. It is advised that doxylamine be kept out of the reach of children. Women who are pregnant are advised to discuss the use of doxylamine with their doctors.
The side effects of doxylamine include dizziness, drowsiness and thickening of mucus, notes Drugs.com. In some cases, severe reactions to the medication occur and require immediate medical attention. Some severe symptoms are convulsions, fast heart rate and hallucinations. An allergic reaction may include difficulty breathing, tightness in the chest, and swelling of the face, tongue and throat.