Background Although fluoxetine is the most frequently prescribedantidepressant drug in the United States, its safety in pregnantwomen has not been established.
Methods From 1989 through 1995, we prospectively identified228 pregnant women taking fluoxetine. We compared the outcomesof their pregnancies with those of 254 women identified in asimilar manner who were not taking fluoxetine.
Results The rate of spontaneous pregnancy loss did not differsignificantly between the women treated with fluoxetine andthe control women (10.5 percent and 9.1 percent, respectively),nor was the rate of major structural anomalies significantlydifferent (5.5 percent vs. 4.0 percent). Among the 97 infantsexposed to fluoxetine who were evaluated for minor anomalies,the incidence of three or more minor anomalies was significantlyhigher than among 153 similarly examined control infants (15.5percent vs. 6.5 percent, P = 0.03). As compared with the 101infants exposed to fluoxetine only during the first and secondtrimesters, the 73 infants exposed during the third trimesterhad higher rates of premature delivery (relative risk, 4.8;95 percent confidence interval, 1.1 to 20.8), admission to special-carenurseries (relative risk, 2.6; 95 percent confidence interval,1.1 to 6.9), and poor neonatal adaptation, including respiratorydifficulty, cyanosis on feeding, and jitteriness (relative risk,8.7; 95 percent confidence interval, 2.9 to 26.6). Birth weightwas also lower and birth length shorter in infants exposed tofluoxetine late in gestation.
Conclusions Women who take fluoxetine during pregnancy do nothave an increased risk of spontaneous pregnancy loss or majorfetal anomalies, but women who take fluoxetine in the thirdtrimester are at increased risk for perinatal complications.
Source Information
From the Department of Pediatrics, Division of Dysmorphology and Teratology, University of CaliforniaSan Diego, La Jolla.
Address reprint requests to Dr. Jones at the Department of Pediatrics #8446, UCSD Medical Center, 200 W. Arbor Dr., San Diego, CA 92103.
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