Naproxen Pregnancy and Breastfeeding Warnings
Naproxen is also known as: Aflaxen, Aleve, All Day Pain Relief, All Day Relief, Anaprox, Anaprox-DS, Comfort Pac with Naproxen, EC-Naprosyn, Flanax Pain Reliever, Leader Naproxen Sodium, Midol Extended Relief, Naprelan, Naprosyn, Naproxen Sodium DS, Pamprin All Day Relief
Naproxen Pregnancy Warnings
Animal studies have revealed evidence of decreased fetal body weight, an increase in embryofetal death, and an increase in the total incidences of fetal abnormalities. These fetal abnormalities included increasing incidences of specific malformations (cardiac interventricular septal defect, fused caudal vertebrae, and variations (absent intermediate lobe of the lung, irregular ossification of the skull, and incompletely ossified sternal centra). There are no controlled data in human pregnancy. Use late in pregnancy may cause premature closure of the ductus arteriosus and prolong labor and delivery. Naproxen should be avoided in the third trimester. Naproxen is only recommended for use during pregnancy when there are no alternatives and benefit outweighs risk. Naproxen cord blood levels were obtained from two twins delivered at 30 weeks gestation of a mother treated for premature labor with naproxen 250 mg every eight hours, beginning 30 hours prior to delivery. The last dose was administered five hours before delivery. Naproxen concentrations were 59.5 mcg/mL in the first twin and 68 mcg/mL in the second twin. Both infants suffered from pulmonary hypertension and required assisted ventilation. One infant died. The pulmonary hypertension was presumed to be the result of intrauterine closure of the ductus arteriosus mediated by the naproxen-induced inhibition of fetal prostaglandin synthesis. FDA pregnancy category C: Animal reproduction studies have shown an adverse effect on the fetus and there are no adequate and well-controlled studies in humans, but potential benefits may warrant use of the drug in pregnant women despite potential risks.
FDA pregnancy category: C Naproxen should be avoided in late pregnancy because it may cause premature closure of the ductus arteriosus.
Naproxen Breastfeeding Warnings
Use of naproxen is not recommended. Excreted into human milk: Yes Prostaglandin-inhibiting drugs may have adverse effects in nursing infants.
The excretion of naproxen into breast milk was evaluated in a 23-year-old female following chronic administration of naproxen 250 mg twice a day. Milk concentrations peaked at 4 hours postdose and ranged from 1.14 to 1.25 ng/mL. Following a regimen of naproxen 375 mg twice a day, maximum milk concentrations averaged 2.37 ng/mL. Maternal and infant plasma samples were not obtained during the study. However, urine was collected from both mother and infant. The infant eliminated 0.47 mg naproxen and conjugates in the urine over a 12-hour postdose period.
Disclaimer: Every effort has been made to ensure that the information provided by Cerner Multum, Wolters Kluwer Health and Drugs.com is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This drug information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate that the drug or combination is safe, effective, or appropriate for any given patient. Multum Information Services, Inc. does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. Copyright 2000-2008 Multum Information Services, Inc. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse, or pharmacist.