Safety of the insect repellent N,N-diethyl-M-toluamide (DEET) in pregnancy.

R McGready Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.

Search for other papers by R McGready in
Current site
Google Scholar
PubMed
Close
,
K A Hamilton Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.

Search for other papers by K A Hamilton in
Current site
Google Scholar
PubMed
Close
,
J A Simpson Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.

Search for other papers by J A Simpson in
Current site
Google Scholar
PubMed
Close
,
T Cho Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.

Search for other papers by T Cho in
Current site
Google Scholar
PubMed
Close
,
C Luxemburger Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.

Search for other papers by C Luxemburger in
Current site
Google Scholar
PubMed
Close
,
R Edwards Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.

Search for other papers by R Edwards in
Current site
Google Scholar
PubMed
Close
,
S Looareesuwan Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.

Search for other papers by S Looareesuwan in
Current site
Google Scholar
PubMed
Close
,
N J White Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.

Search for other papers by N J White in
Current site
Google Scholar
PubMed
Close
,
F Nosten Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.

Search for other papers by F Nosten in
Current site
Google Scholar
PubMed
Close
, and
S W Lindsay Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.

Search for other papers by S W Lindsay in
Current site
Google Scholar
PubMed
Close
Restricted access

The safety of daily application of N, N-diethyl-m-toluamide (DEET) (1.7 g of DEET/day) in the second and third trimesters of pregnancy was assessed as part of a double-blind, randomized, therapeutic trial of insect repellents for the prevention of malaria in pregnancy (n = 897). No adverse neurologic, gastrointestinal, or dermatologic effects were observed for women who applied a median total dose of 214.2 g of DEET per pregnancy (range = 0-345.1 g). DEET crossed the placenta and was detected in 8% (95% confidence interval = 2.6-18.2) of cord blood samples from a randomly selected subgroup of DEET users (n = 50). No adverse effects on survival, growth, or development at birth, or at one year, were found. This is the first study to document the safety of DEET applied regularly in the second and third trimesters of pregnancy. The results suggest that the risk of DEET accumulating in the fetus is low and that DEET is safe to use in later pregnancy.

Save