(Newly
added section)
Premature Closure of
Fetal Ductus Arteriosus
Avoid use of NSAIDs, including NAPROSYN Tablets, EC-NAPROSYN, and
ANAPROX DS, in pregnant women at about 30 weeks of
gestation and later. NSAIDs, including NAPROSYN Tablets,
EC-NAPROSYN, and ANAPROX DS, increase
the risk of premature closure of
the fetal ductus arteriosus at approximately this gestational age.
Oligohydramnios/Neonatal Renal Impairment
Use of NSAIDs, including NAPROSYN Tablets, EC-NAPROSYN, and ANAPROX DS, at about
20 weeks gestation or later
in
pregnancy may cause fetal renal
dysfunction leading to oligohydramnios and,
in some cases, neonatal renal impairment. These adverse outcomes are seen, on average, after days to weeks of treatment,
although oligohydramnios has been infrequently
reported as soon as 48
hours after NSAID initiation. Oligohydramnios is often,
but not always, reversible with treatment discontinuation.
Complications of prolonged
oligohydramnios may, for example, include
limb contractures and delayed lung maturation. In some postmarketing
cases of impaired neonatal renal function, invasive procedures such as exchange
transfusion or dialysis were required.
If NSAID treatment is
necessary between about 20 weeks and
30 weeks gestation, limit NAPROSYN
Tablets, EC-NAPROSYN, or ANAPROX
DS use to the lowest effective dose and shortest duration possible. Consider ultrasound monitoring of amniotic fluid if NAPROSYN Tablets, EC-NAPROSYN, or ANAPROX DS treatment extends beyond 48 hours. Discontinue
NAPROSYN Tablets, EC-NAPROSYN,
and ANAPROX DS if oligohydramnios occurs and follow up according to
clinical practice [see Use in Specific
Populations (8.1)].
(Additions and/or revisions underlined)
Risk Summary
Use of NSAIDs, including NAPROSYN Tablets, EC-NAPROSYN, and ANAPROX DS, can cause premature closure of the fetal ductus arteriosus and fetal renal dysfunction leading to oligohydramnios and, in some cases, neonatal renal impairment. Because of these risks, limit dose and duration of NAPROSYN
Tablets, EC-NAPROSYN, or ANAPROX DS use between about 20 and 30 weeks of gestation, and avoid NAPROSYN Tablets, EC-NAPROSYN, and ANAPROX DS use at about 30 weeks of
gestation and later in pregnancy (see Clinical
Considerations, Data).
Premature
Closure of
Fetal Ductus Arteriosus
Use of NSAIDs, including NAPROSYN Tablets, EC-NAPROSYN, and ANAPROX DS, at about 30 weeks gestation
or later in pregnancy
increases the risk of premature closure of the
fetal ductus arteriosus.
Oligohydramnios/Neonatal
Renal Impairment
Use of NSAIDs at about 20 weeks gestation
or later in pregnancy
has been associated with cases of fetal renal dysfunction leading
to oligohydramnios, and in some cases,
neonatal renal impairment.
Data
from observational studies regarding other potential embryofetal risks of NSAID use in women in the first or second trimesters of pregnancy are inconclusive. In animal reproduction studies in rats, rabbits, and mice no evidence of teratogenicity or fetal harm when naproxen
was administered during the period of organogenesis at doses 0.13, 0.26, and 0.6 times the maximum recommended human daily dose of 1500 mg/day, respectively [see Data]. Based on animal data, prostaglandins have been
shown to have an important role in endometrial vascular permeability,
blastocyst implantation, and decidualization. In animal studies,
administration of prostaglandin synthesis inhibitors such as naproxen, resulted in increased pre- and post- implantation loss. Prostaglandins also have been shown to have an important role in fetal kidney development. In published animal studies, prostaglandin synthesis inhibitors have been reported to impair kidney development when administered at clinically relevant
doses.
The estimated
background risk of major birth defects
and miscarriage for the indicated population(s) is unknown. All pregnancies have a background risk of birth defect,
loss, or other adverse
outcomes. In the U.S. general
population, the estimated background risk of major birth defects
and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.
Clinical
Considerations
Fetal/Neonatal Adverse Reactions
Premature Closure of Fetal Ductus
Arteriosus:
Avoid use of NSAIDs in women at about 30 weeks gestation and later in pregnancy, because NSAIDs, including NAPROSYN Tablets,
EC-NAPROSYN, and ANAPROX DS,
can cause premature closure of the
fetal ductus arteriosus (see Data).
Oligohydramnios/Neonatal Renal Impairment:
If an NSAID is necessary at about 20 weeks gestation or later in pregnancy, limit the use to the lowest effective
dose and shortest duration possible. If NAPROSYN Tablets, EC-NAPROSYN, or ANAPROX DS treatment extends beyond 48 hours, consider monitoring with ultrasound for oligohydramnios. If oligohydramnios occurs, discontinue NAPROSYN Tablets, EC- NAPROSYN,
and ANAPROX DS, and follow up according
to clinical practice (see
Data).
Labor or Delivery
There are no studies
on the effects of NAPROSYN Tablets, EC-NAPROSYN, or ANAPROX DS during labor or delivery.
In animal studies, NSAIDS, including naproxen, inhibit prostaglandin synthesis, cause delayed parturition, and increase the incidence
of stillbirth.
Data
Human Data
There is some evidence
to suggest that when inhibitors of prostaglandin synthesis are used to delay preterm labor, there is an increased risk of neonatal
complications such as necrotizing enterocolitis, patent ductus arteriosus, and intracranial hemorrhage. Naproxen treatment given in late pregnancy to delay parturition has been associated with persistent pulmonary hypertension, renal dysfunction, and abnormal prostaglandin E levels in preterm infants.
Because of the known effects of nonsteroidal anti- inflammatory drugs on the fetal cardiovascular system (closure of ductus arteriosus), use during pregnancy (particularly starting at
30-weeks of gestation, or third trimester)
should be avoided.
Premature Closure of Fetal Ductus Arteriosus:
Published
literature reports that the use of NSAIDs at about 30 weeks of gestation
and later in pregnancy may cause premature closure
of the fetal ductus arteriosus.
Oligohydramnios/Neonatal Renal Impairment:
Published
studies and postmarketing reports describe maternal NSAID use at about 20 weeks gestation or later in pregnancy
associated with fetal renal dysfunction leading to oligohydramnios, and in some cases, neonatal renal impairment. These adverse outcomes are seen, on average,
after days to weeks of treatment, although oligohydramnios has been infrequently reported as soon as 48 hours after NSAID initiation. In many cases,
but not all, the decrease
in amniotic fluid was transient and reversible with cessation of the drug. There have been a limited number of case reports
of maternal NSAID use and neonatal
renal dysfunction without oligohydramnios, some of which were irreversible. Some cases of neonatal
renal dysfunction required treatment with
invasive procedures, such as exchange transfusion
or dialysis.
Methodological limitations of these postmarketing studies and reports include lack of a control group; limited information regarding dose, duration, and timing of drug exposure; and concomitant use of other medications. These limitations preclude establishing a reliable
estimate of the risk of adverse fetal and neonatal outcomes with maternal NSAID use. Because the published safety data on neonatal outcomes involved mostly preterm infants, the generalizability of certain reported risks to the full-term
infant exposed to NSAIDs through maternal use is uncertain.
Animal data
Reproduction studies have been performed in rats
at 20 mg/kg/day (0.13 times
the maximum recommended human daily
dose of 1500 mg/day based on body surface area comparison), rabbits at 20 mg/kg/day (0.26 times the maximum recommended human daily dose, based on body surface area comparison), and mice at 170 mg/kg/day (0.6 times the maximum recommended human daily dose based on body surface
area comparison) with no evidence of impaired
fertility or harm to the fetus due to the drug.
(Additions and/or revisions underlined)
Serious
Skin Reactions, including DRESS
Advise
patients to stop taking
NAPROSYN Tablets, EC-NAPROSYN or
ANAPROX DS immediately if they develop any type of rash or fever and to contact their healthcare provider as soon as possible [see Warnings and Precautions (5.9,
5.10)].
Female Fertility
Advise females of reproductive potential
who desire pregnancy that NSAIDs, including NAPROSYN Tablets, EC- NAPROSYN,
and ANAPROX DS, may be associated with a reversible delay in ovulation (see
Use in Specific Populations (8.3).
Fetal Toxicity
Inform pregnant women to avoid use of NAPROSYN
Tablets, EC-NAPROSYN or ANAPROX DS and other NSAIDs starting
at 30 weeks gestation
because of the risk of the premature
closing of the fetal ductus arteriosus. If treatment with NAPROSYN Tablets, EC-NAPROSYN, or ANAPROX
DS is needed for a pregnant
woman between about 20 to 30 weeks gestation, advise her that she may need to be monitored for oligohydramnios, if treatment continues for longer than 48 hours [see Warnings and Precautions (5.11)
and Use in Specific Populations (8.1)].