Safely using insect repellent
Posted on Jul 7, 2008 DEET-containing products are the most effective mosquito and tick repellents available. Insect reprellents containing DEET with a concentration of 10% appear to be as safe as products with a concentration of 30% when used according to the directions on the product labels. DEET is not recommended for use in children under 2 months of age.
The concentration of DEET in products may range from less than 10% to over 30%. The effectiveness of DEET peaks at a concentration of 30%, which is the maximum concentration currently recommended for infants and children. The major difference in the effectiveness of different strengths relates to their duration of action. Products with concentrations around 10% are effective for periods of approximately 2 hours. As the concentration of DEET increases, the duration of activity increases. For example, a concentration of about 24% has been shown to provide an average of 5 hours of protection. The safety of DEET does not apprear to relate to the differences in these concentrations. A prudent approach would be to select the lowest concentration effective for the amount of time spent outdoors.
It is generally agreed that DEET should not be applied more than once per day. DEET should not be used in a product that combines the repellent with a sunscreen. Sunscreens often are applied repeatedly because they can be washed off. DEET is not water-soluble and will last up to 8 hours on the skin. Repeated applications may increase the potential toxic effects of DEET.
Other precautions when using DEET:
1. Apply DEET sparingly on exposed skin; do not use under clothing. 2. Do not use DEET on the hands of young children; avoid applying to areas around the eyes and mouth. 3. Do not use DEET over cuts, wounds or irritated skin. Wash treated skin with soap and water after returning indoors; wash treated clothing. 4. Avoid spraying in enclosed areas; do not use DEET near food.
