Is liquid mosquito repellent toxic?

Mosquito repellent liquid is generally considered slightly toxic, but its toxicity is relatively low. The main active ingredients in mosquito repellent liquid are synthetic pyrethroids—chemical compounds modeled after natural pyrethrins and artificially synthesized as insecticides. Although pyrethroids are mildly toxic, they primarily target and kill mosquitoes and pose minimal toxicity to humans. However, the components in mosquito repellent liquid can be irritating. Improper use, such as excessive dosage or prolonged use in poorly ventilated spaces, may cause discomfort symptoms including headache, dizziness, fatigue, blurred vision, nausea, and vomiting. Therefore, when using mosquito repellent liquid, ensure adequate indoor ventilation, avoid prolonged use in enclosed spaces, and follow the instructions provided on the product label.