Choose DEET repellent by the pests on its label, the planned time outdoors, and the person who will use it. The concentration is one clue; the complete product instructions determine how to apply and reapply it.
DEET is an ingredient used to repel biting pests, including mosquitoes and ticks. This guide follows U.S. guidance. Products and permitted uses differ across countries, so read the label on the container you actually have.
Turn the outing into a product choice
- Name the exposure. A mosquito-heavy evening and a walk through tick habitat may call for different protection claims. Check that the target pest appears on the label.
- Estimate time outside. Include waiting, return travel on foot, and likely delays. A short activity can become a longer exposure.
- Compare registered products. Use the EPA repellent search tool and then check the container’s directions and EPA registration number.
- Plan reapplication. Note the label’s limits and instructions for conditions such as water or heavy perspiration. Carry the original labeled container.
Higher DEET concentrations generally extend protection time, but formulation and use conditions also matter. Avoid turning a percentage into a guaranteed number of hours. EPA’s tool helps narrow choices; it cannot predict exactly how every application will perform in your conditions.
Apply a controlled amount
Follow EPA’s application guidance and the product label:
- Apply only to exposed skin or clothing where the label allows; keep repellent out from under clothing.
- Keep it away from cuts, irritated skin, eyes, and mouth. For the face, put spray on your hands first, then apply carefully.
- Use enough for the instructed coverage. Extra soaking does not make a useful substitute for correct reapplication.
- Spray in an open area, away from food, and avoid inhaling the mist. Check flammability warnings.
- Wash treated skin after returning indoors and wash treated clothing before wearing it again.
Use separate sunscreen and repellent products, since their reapplication schedules differ. Apply sunscreen first, then repellent, following each label. Keep the repellent accessible to the responsible adult and out of young children’s reach.
Read pediatric advice in its proper scope
EPA’s DEET page states that its approval has no general age or concentration restriction for children, while directing users to the product label. That regulatory statement is different from individualized advice for an infant or a child with particular health needs.
The American Academy of Pediatrics’ parent guidance urges sparing application when needed in children under two and particular caution for newborns and premature infants. Ask the child’s pediatrician about those situations and the risk of insect-borne disease where you will be. Do not transfer an age rule from a different repellent ingredient to DEET.
An adult should apply repellent for a young child, keeping it off the child’s hands, eyes, and mouth. Clothing and stroller or carrier mosquito netting can reduce exposed skin. Oil of lemon eucalyptus and PMD have separate restrictions: the AAP advises against their use under age three.
Build protection around the product
Use long, loose-fitting clothing and check window or door screens. When planning for West Nile virus prevention, think about exposure around home as well as on a trip. Repellent on one person does not address standing water or a damaged screen.
Choose products for their labeled purpose. Permethrin clothing or gear treatment is a different task from applying a skin repellent; follow that product’s instructions and keep it off skin. Human repellent should not be used on pets unless specifically labeled for that use.
If you suspect a reaction, stop using the product, wash the treated skin, and contact a clinician or Poison Help in the U.S. at 1-800-222-1222. Keep the container so the ingredient and formulation can be identified. For severe symptoms, seek emergency help.
A quick label record
Before leaving, record the product name, registration number, target pests, allowed application sites, reapplication instructions, and any user-specific restriction. Photograph the label for reference while keeping the labeled container. If a direction is unclear, resolve it with the manufacturer or clinician before using the product.