Lovenox (and also heparin) does not cross the placenta so your baby is not exposed to the drug during pregnancy. Also I want to point out that blood clots can be fatal to both mother and/or baby so it is very important to treat them. Here is what the manufacturer has to say about the drugs use during pregnancy and in Nursing mothers:
Pregnancy Category B
All pregnancies have a background risk of birth defect, loss, or other adverse outcome regardless of drug exposure. The fetal risk summary below describes the potential of Lovenox to increase the risk of developmental abnormalities above the background risk.
Fetal Risk Summary
Lovenox does not cross the placenta, and is not expected to result in fetal exposure to the drug. Human data from a retrospective cohort study, which included 693 live births, suggest that Lovenox does not increase the risk of major developmental abnormalities. Based on animal data, enoxaparin is not predicted to increase the risk of major developmental abnormalities (see Data).
Pregnancy alone confers an increased risk for thromboembolism that is even higher for women with thromboembolic disease and certain high risk pregnancy conditions. While not adequately studied, pregnant women with mechanical prosthetic heart valves may be at even higher risk for thrombosis [see WARNINGS AND PRECAUTIONS and Use In Specific Populations]. Pregnant women with thromboembolic disease, including those with mechanical prosthetic heart valves and those with inherited or acquired thrombophilias, have an increased risk of other maternal complications and fetal loss regardless of the type of anticoagulant used.
All patients receiving anticoagulants, including pregnant women, are at risk for bleeding. Pregnant women receiving enoxaparin should be carefully monitored for evidence of bleeding or excessive anticoagulation. Consideration for use of a shorter acting anticoagulant should be specifically addressed as delivery approaches [see BOXED WARNING]. Hemorrhage can occur at any site and may lead to death of mother and/or fetus. Pregnant women should be apprised of the potential hazard to the fetus and the mother if enoxaparin is administered during pregnancy.
It is not known if monitoring of anti-Factor Xa activity and dose adjustment (by weight or anti-Factor Xa activity) of Lovenox affect the safety and the efficacy of the drug during pregnancy.
Cases of “gasping syndrome” have occurred in premature infants when large amounts of benzyl alcohol have been administered (99-405 mg/kg/day). The multiple-dose vial of Lovenox contains 15 mg benzyl alcohol per 1 mL as a preservative [see WARNINGS AND PRECAUTIONS].
Human Data -There are no adequate and well-controlled studies in pregnant women. A retrospective study reviewed the records of 604 women who used enoxaparin during pregnancy. A total of 624 pregnancies resulted in 693 live births. There were 72 hemorrhagic events (11 serious) in 63 women. There were 14 cases of neonatal hemorrhage. Major congenital anomalies in live births occurred at rates (2.5%) similar to background rates.
There have been postmarketing reports of fetal death when pregnant women received Lovenox. Causality for these cases has not been determined. Insufficient data, the underlying disease, and the possibility of inadequate anticoagulation complicate the evaluation of these cases.
A clinical study using enoxaparin in pregnant women with mechanical prosthetic heart valves has been conducted [see WARNINGS AND PRECAUTIONS].
Animal Data -Teratology studies have been conducted in pregnant rats and rabbits at SC doses of enoxaparin up to 15 times the recommended human dose (by comparison with 2 mg/kg as the maximum recommended daily dose). There was no evidence of teratogenic effects or fetotoxicity due to enoxaparin. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.
It is not known whether Lovenox is excreted in human milk. Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in nursing infants from Lovenox, a decision should be made whether to discontinue nursing or discontinue Lovenox, taking into account the importance of Lovenox to the mother and the known benefits of nursing.
There is definitely more risk involved in NOT treating blood clots and DVT's in pregnant women than in treating them with either Lovenox or Heparin. When Drs consider giving a drug to a pregnant woman they consider what is called a risk to benefit ratio. In this case, the risk is much less than the benefit, so the drug must be given.
- Lovenox Information for Consumers
- Lovenox Information for Healthcare Professionals (includes dosage details)
- Side Effects of Lovenox (detailed)
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