Is it safe to smell mosquito repellent lotion during pregnancy?

During pregnancy, it is generally advisable to avoid prolonged or repeated exposure to the strong chemical odor of mosquito repellent lotions (commonly known as “Hua Lu Shui” in Chinese), particularly those containing high concentrations of alcohol, camphor, menthol, and eucalyptus oil. While occasional, brief, low-level exposure—such as walking past an open bottle—is unlikely to pose a significant risk to maternal or fetal health, intentional or frequent inhalation is not recommended.

The primary concern stems from certain volatile ingredients: camphor and menthol, in particular, are lipophilic compounds that can be absorbed through mucous membranes and may cross the placenta. Although human data on adverse fetal outcomes from typical environmental exposure are limited, animal studies suggest potential neurotoxic or teratogenic effects at high doses. Additionally, strong olfactory stimuli may trigger nausea, dizziness, or respiratory irritation—symptoms that can be more pronounced during pregnancy due to heightened olfactory sensitivity and physiological changes in respiratory and cardiovascular function.

Pregnant individuals should prioritize safer alternatives for insect bite prevention, such as EPA-registered repellents containing DEET (up to 30%), picaridin, or oil of lemon eucalyptus (OLE) — all of which have robust safety profiles in pregnancy when used as directed. Non-chemical measures—including wearing long sleeves, using bed nets, and eliminating standing water—are also highly effective and carry no pharmacological risk.

If accidental or brief exposure occurs, there is no need for alarm; however, persistent symptoms (e.g., headache, wheezing, or palpitations) warrant prompt medical evaluation. As always, individual concerns should be discussed with an obstetrician or maternal-fetal medicine specialist to ensure personalized, evidence-based guidance.