Naproxen 500 mg Tablet, Delayed Release, 100-count
Other active recalls for Naproxen (different manufacturers) — 1 · tap to view
🆔 Identity & classification
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🏷️ RxNorm drug class
This medicine belongs to the Nonsteroidal Anti-inflammatory Drug class.
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🏭 Manufacturer & labeler
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🩺 Clinical
Prescription naproxen is used to relieve pain, tenderness, swelling, and stiffness caused by osteoarthritis (arthritis caused by a breakdown of the lining of the joints), rheumatoid arthritis (arthritis caused by swelling of the lining of the joints), juvenile arthritis (a form of joint disease in children), and ankylosing spondylitis (arthritis that mainly affects the spine). Prescription naproxen tablets, extended-release tablets, and suspension are also used to relieve shoulder pain caused by bursitis (inflammation of a fluid-filled sac in the shoulder joint), tendinitis (inflammation of th...
Read the full MedlinePlus article ↗- They're very similar — naproxen sodium is just the salt form of naproxen, and it dissolves in water more quickly. That means your body absorbs naproxen sodium a bit faster, so it t...
- What's the difference between naproxen and naproxen sodium — are they the same thing?
- You can take it either way, but taking it with food, milk, or a full glass of water is a good idea because it helps protect your stomach. Naproxen can irritate the lining of your s...
- Can I take naproxen on an empty stomach, or do I need to eat first?
Patient education
Supplement & herbal interactions
Some supplements/herbs that may interact with Naproxen — tap one for details:
Naproxen may be associated with lower levels of 1 nutrient — worth a chat with your pharmacist, not a cause for alarm.
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Ask a licensed pharmacist directly — free, answered by our team.
💊 What it looks like
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🧪 Inactive Ingredients / Excipients
Inactive ingredients, also called excipients, are components of the drug product other than the active ingredient. They may include fillers, dyes, coatings, preservatives, flavors, or other formulation ingredients.
💡 Tap an ingredient (hover on desktop) to see what it is and why it’s used.
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UNII M28OL1HH48
Croscarmellose sodium is a plant-based substance derived from cellulose. It acts as a disintegrant, helping tablets and capsules break down quickly in the digestive system so the medicine can be absorbed.
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UNII 70097M6I30
Magnesium stearate is a salt made from magnesium and stearic acid, a fatty substance. It's used in tablets and capsules as a lubricant and glidant to help ingredients flow smoothly during manufacturing and prevent sticking.
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UNII 74G4R6TH13
A synthetic polymer made by combining two plastic-like chemicals. It forms a coating on tablets or capsules that dissolves at a specific point in the digestive tract, controlling where and when the medicine releases.
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UNII FZ989GH94E
Povidone is a synthetic polymer made from a plastic-like material. It acts as a binder to hold tablet ingredients together and as a disintegrant to help the tablet break apart in your stomach so the medicine can be absorbed.
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UNII 55X04QC32I
A strong alkaline chemical used to adjust and maintain the pH balance of liquid medicines. It helps keep the medicine stable and ensures it stays effective during storage.
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UNII 7SEV7J4R1U
A powder made from a naturally occurring mineral. In medicines, talc works as a glidant and anti-caking agent, helping tablets and capsules flow smoothly during manufacturing and preventing clumping.
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UNII 8Z96QXD6UM
Triethyl citrate is a clear liquid derived from citric acid. It acts as a plasticizer and solvent in tablet coatings and film formulations, helping the coating remain flexible and adhere properly to the medicine.
7 inactive ingredients listed in the exact product block matched to this NDC.
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ingredient classCode="IACT" elements from the exact product block matched by this NDC. Label-section narrative from DailyMed / the openFDA label index is shown separately when available.Inactive ingredient FAQ
Are inactive ingredients the same for every manufacturer?
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💲 Pricing
A drug doesn't have one price. Each row is a different public payment system, and none is what you'd pay at the counter — that depends on your insurance. The ⓘ on each row explains what it measures.
| Price system | Per ea | Per package |
|---|---|---|
| Retail pharmacies payNADAC · weekly | $1.864 | $186.43 / 100 tablets |
| Medicaid paysCMS SDUD · 12 mo | No recent Medicaid claims on file for this NDC — rare and low-volume NDCs are suppressed in the public data. | |
| Medicare drug plans payPart D · Q2 2026 | $0.8963 | $89.63 / 100 tablets |
Where does this data come from?
🔁 Therapeutic equivalents
| Product | Labeler | Pack | NADAC/unit | TE | Status | Price vs. this |
|---|---|---|---|---|---|---|
| Naproxen 500 mg 42494-0454-10 | Cameron | 100 tablets | $1.864 | AB | Availability likely | — |
| Naproxen 500 mg 52817-0381-10 | TruPharma | 100 tablets | $1.864 | AB | Availability likely | — |
| Naproxen 500 mg 70954-0928-10 | ANI | 100 tablets | $1.864 | AB | Availability likely | — |
| Naproxen 500 mgthis 90096-0161-01 | Zameer | 100 tablets | $1.864 | AB | Availability likely | — |
| Naproxen 500 mg 11534-0212-01 | Sunrise | 100 tablets | — | AB | FDA listed | — |
| Naproxen 500 mg 59651-0987-01 | Aurobindo | 100 tablets | — | AB | FDA listed | — |
| Naproxen 500 mg 66267-0373-20 | NuCare | 20 tablets | — | AB | FDA listed | — |
| Naproxen 500 mg 69097-0852-07 | Cipla | 100 tablets | — | AB | FDA listed | — |
| Naproxen 500 mg 72162-2276-01 | Bryant | 100 tablets | — | AB | FDA listed | — |
| Naproxen 500 mg 72789-0003-60 | PD-Rx | 60 tablets | — | AB | FDA listed | — |
Where does this data come from?
⏳ Availability & generic status
FDA-approved generic versions are listed, and recent pricing/market data suggests they may be available — see Therapeutic equivalents.
Where does this data come from?
📊 Medicare Part D spend CMS · PART D · 2026 (Q1)
🔬 Reported adverse events (FAERS)
Top reported reactions
Age at onset
Reporter sex
Serious outcomes
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📦 Packaging — all sizes for this product
| Package NDC | Description | Marketing start | Status |
|---|---|---|---|
| 90096-0161-01 You're viewing this | 100 TABLET, DELAYED RELEASE in 1 BOTTLE (90096-161-01) | 2025-08-31 | Active |
📄 Full prescribing information FDA SPL
🚨 Boxed Warning ▾
WARNING: RISK OF SERIOUS CARDIOVASCULAR AND GASTROINTESTINAL EVENTS WARNING: RISK OF SERIOUS CARDIOVASCULAR AND GASTROINTESTINAL EVENTS Cardiovascular Thrombotic Events • Nonsteroidal anti-inflammatory drugs (NSAIDs) cause an increased risk of serious cardiovascular thrombotic events, including myocardial infarction and stroke, which can be fatal. This risk may occur early in treatment and may increase with duration of use [see Warnings and Precautions (5.1) ]. • Naproxen tablets are contraindicated in the setting of coronary artery bypass graft (CABG) surgery [see Contraindications (4) , Warnings and Precautions (5.1) ].
Gastrointestinal Bleeding, Ulceration, and Perforation NSAIDs cause an increased risk of serious gastrointestinal (GI) adverse events including bleeding, ulceration, and perforation of the stomach or intestines, which can be fatal. These events can occur at any time during use and without warning symptoms. Elderly patients and patients with a prior history of peptic ulcer disease and/or GI bleeding are at greater risk for serious GI events [see Warnings and Precautions (5.2) ].
🎯 Indications and Usage ▾
1 INDICATIONS & USAGE NAPROXEN Tablets, Naproxen Delayed-Release Tablets, and NAPROXEN SODIUM are indicated for: the relief of the signs and symptoms of: • rheumatoid arthritis • osteoarthritis • ankylosing spondylitis • Polyarticular Juvenile Idiopathic Arthritis NAPROXEN Tablets and NAPROXEN SODIUM are also indicated for: the relief of signs and symptoms of: • tendonitis • bursitis • acute gout the management of: • pain • primary dysmenorrhea
⏱️ Dosage and Administration ▾
2 DOSAGE & ADMINISTRATION
2.1General Dosing Instructions Carefully consider the potential benefits and risks of NAPROXEN Tablets, Naproxen Delayed-Release Tablets and NAPROXEN SODIUM and other treatment options before deciding to use NAPROXEN Tablets, Naproxen Delayed-Release Tablets and NAPROXEN SODIUM. Use the lowest effective dose for the shortest duration consistent with individual patient treatment goals [see Warnings and Precautions (5) ]. After observing the response to initial therapy with NAPROXEN Tablets, Naproxen Delayed-Release Tablets or NAPROXEN SODIUM, the dose and frequency should be adjusted to suit an individual patient’s needs.
To maintain the integrity of the enteric coating, the Naproxen Delayed-Release Tablets tablet should not be broken, crushed or chewed during ingestion. Naproxen-containing products such as NAPROXEN, Naproxen Delayed-Release Tablets and NAPROXEN SODIUM, and other naproxen products should not be used concomitantly since they all circulate in the plasma as the naproxen anion
2.2Rheumatoid Arthritis, Osteoarthritis and Ankylosing Spondylitis The recommended dosages of NAPROXEN Tablets, NAPROXEN SODIUM, and Naproxen Delayed-Release Tablets are shown in Table 1. Table 1: Recommended dosages for NAPROXEN Tablets, NAPROXEN SODIUM, and Naproxen Delayed-Release Tablets NAPROXEN Tablets 250 mg (one-half tablet) 500 mg twice daily NAPROXEN SODIUM 275 mg (one-half tablet) 550 mg twice daily Naproxen Delayed-Release Tablets 375 mg or 500 mg twice daily During long-term administration, the dose of naproxen may be adjusted up or down depending on the clinical response of the patient.
A lower daily dose may suffice for long-term administration. The morning and evening doses do not have to be equal in size and administration of the drug more frequently than twice daily does not generally make a difference in response. In patients who tolerate lower doses well, the dose may be increased to naproxen 1500 mg/day for limited periods of up to 6 months when a higher level of anti-inflammatory/analgesic activity is required.
When treating such patients with naproxen 1500 mg/day, the physician should observe sufficient increased clinical benefits to offset the potential increased risk.
2.3Polyarticular Juvenile Idiopathic Arthritis Naproxen solid-oral dosage forms may not allow for the flexible dose titration needed in pediatric patients with polyarticular juvenile idiopathic arthritis. A liquid formulation may be more appropriate for weight-based dosing and due to the need for dose flexibility in children. In pediatric patients, doses of 5 mg/kg/day produced plasma levels of naproxen similar to those seen in adults taking 500 mg of naproxen [see Clinical Pharmacology (12) ].
The recommended total daily dose of naproxen is approximately 10 mg/kg given in 2 divided doses. Dosing with NAPROXEN tablets is not appropriate for children weighing less than 50 kilograms.
2.4Management of Pain, Primary Dysmenorrhea, and Acute Tendonitis and Bursitis The recommended starting dose of NAPROXEN SODIUM (naproxen sodium) tablets is 550 mg followed by 550 mg every 12 hours or 275 mg (one half of a 550 mg tablet) every 6 to 8 hours as required. The initial total daily dose should not exceed 1375 mg (two and one-half tablets) of naproxen sodium. Thereafter, the total daily dose should not exceed 1100 mg of naproxen sodium.
Because the sodium salt of naproxen is more rapidly absorbed, NAPROXEN SODIUM is recommended for the management of acute painful conditions when prompt onset of pain relief is desired. NAPROXEN Tablets may also be used. The recommended starting dose of NAPROXEN Tablets is 500 mg followed by 250 mg (one half of a 500 mg NAPROXEN tablet) every 6-8 hours as required.
The total daily dose should not exceed 1250 mg of naproxen. Naproxen Delayed-Release Tablets is not recommended for initial treatment of acute pain because absorption of naproxen is delayed compared to other naproxen-containing products [see Cli…
💊 Dosage Forms and Strengths ▾
3 DOSAGE FORMS AND STRENGTHS Naproxen Delayed-Release Tablets: 500 mg: white, oblong coated tablets imprinted with NPR EC 500 on one side.
⛔ Contraindications ▾
4 CONTRAINDICATIONS NAPROXEN Tablets, Naproxen Delayed-Release Tablets, and NAPROXEN SODIUM are contraindicated in the following patients: Known hypersensitivity (e.g., anaphylactic reactions and serious skin reactions) to naproxen or any components of the drug product [ see Warnings and Precautions (5.7, 5.9)] History of asthma, urticaria, or other allergic-type reactions after taking aspirin or other NSAIDs. Severe, sometimes fatal, anaphylactic reactions to NSAIDs have been reported in such patients [see Warnings and Precautions ( 5.7 , 5.8 )] In the setting of coronary artery bypass graft (CABG) surgery [see Warnings and Precautions ( 5.1 )]
⚠️ Warnings and Cautions ▾
5 WARNINGS AND PRECAUTIONS
5.1Cardiovascular Thrombotic Events Clinical trials of several COX-2 selective and nonselective NSAIDs of up to three years duration have shown an increased risk of serious cardiovascular (CV) thrombotic events, including myocardial infarction (MI) and stroke, which can be fatal. Based on available data, it is unclear that the risk for CV thrombotic events is similar for all NSAIDs. The relative increase in serious CV thrombotic events over baseline conferred by NSAID use appears to be similar in those with and without known CV disease or risk factors for CV disease.
However, patients with known CV disease or risk factors had a higher absolute incidence of excess serious CV thrombotic events, due to their increased baseline rate. Some observational studies found that this increased risk of serious CV thrombotic events began as early as the first weeks of treatment. The increase in CV thrombotic risk has been observed most consistently at higher doses.
To minimize the potential risk for an adverse CV event in NSAID-treated patients, use the lowest effective dose for the shortest duration possible. Physicians and patients should remain alert for the development of such events, throughout the entire treatment course, even in the absence of previous CV symptoms. Patients should be informed about the symptoms of serious CV events and the steps to take if they occur.
There is no consistent evidence that concurrent use of aspirin mitigates the increased risk of serious CV thrombotic events associated with NSAID use. The concurrent use of aspirin and an NSAID, such as naproxen, increases the risk of serious gastrointestinal (GI) events [see Warnings and Precautions (5.2) ]. Status Post Coronary Artery Bypass Graft (CABG) Surgery Two large, controlled clinical trials of a COX-2 selective NSAID for the treatment of pain in the first 10-14 days following CABG surgery found an increased incidence of myocardial infarction and stroke.
NSAIDs are contraindicated in the setting of CABG [see Contraindications (4) ]. Post-MI Patients Observational studies conducted in the Danish National Registry have demonstrated that patients treated with NSAIDs in the post-MI period were at increased risk of reinfarction, CV-related death, and all-cause mortality beginning in the first week of treatment. In this same cohort, the incidence of death in the first year post-MI was 20 per 100 person years in NSAID-treated patients compared to 12 per 100 person years in non-NSAID exposed patients.
Although the absolute rate of death declined somewhat after the first year post-MI, the increased relative risk of death in NSAID users persisted over at least the next four years of follow-up. Avoid the use of NAPROXEN Tablets, Naproxen Delayed-Release Tablets, and NAPROXEN SODIUM in patients with a recent MI unless the benefits are expected to outweigh the risk of recurrent CV thrombotic events. If NAPROXEN Tablets, Naproxen Delayed-Release Tablets and NAPROXEN SODIUM are used in patients with a recent MI, monitor patients for signs of cardiac ischemia.
5.2Gastrointestinal Bleeding, Ulceration, and Perforation NSAIDs, including naproxen, cause serious gastrointestinal (GI) adverse events including inflammation, bleeding, ulceration, and perforation of the esophagus, stomach, small intestine, or large intestine, which can be fatal. These serious adverse events can occur at any time, with or without warning symptoms, in patients treated with NSAIDs. Only one in five patients who develop a serious upper GI adverse event on NSAID therapy is symptomatic.
Upper GI ulcers, gross bleeding, or perforation caused by NSAIDs occurred in approximately 1% of patients treated for 3-6 months, and in about 2%-4% of patients treated for one year. However, even short-term NSAID therapy is not without risk. Risk Factors for GI Bleeding, Ulceration, and Perforation Patients with a prior history of peptic ulcer disease and/or GI bleeding who used NSAIDs had a gr…
🤒 Adverse Reactions ▾
6 ADVERSE REACTIONS
6.1Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. Adverse reactions reported in controlled clinical trials in 960 patients treated for rheumatoid arthritis or osteoarthritis are listed below. In general, reactions in patients treated chronically were reported 2 to 10 times more frequently than they were in short- term studies in the 962 patients treated for mild to moderate pain or for dysmenorrhea.
The most frequent complaints reported related to the gastrointestinal tract. A clinical study found gastrointestinal reactions to be more frequent and more severe in rheumatoid arthritis patients taking daily doses of 1500 mg naproxen compared to those taking 750 mg naproxen. In controlled clinical trials with about 80 pediatric patients and in well-monitored, open-label studies with about 400 pediatric patients with polyarticular juvenile idiopathic arthritis treated with naproxen, the incidence of rash and prolonged bleeding times were greater, the incidence of gastrointestinal and central nervous system reactions were about the same, and the incidence of other reactions were lower in pediatric patients than in adults.
In patients taking naproxen in clinical trials, the most frequently reported adverse experiences in approximately 1% to 10% of patients were: Gastrointestinal (GI) Experiences, including : heartburn*, abdominal pain*, nausea*, constipation*, diarrhea, dyspepsia, stomatitis Central Nervous System : headache*, dizziness*, drowsiness*, lightheadedness, vertigo Dermatologic: pruritus (itching)*, skin eruptions*, ecchymoses*, sweating, purpura Special Senses: tinnitus*, visual disturbances, hearing disturbances Cardiovascular : edema*, palpitations General : dyspnea*, thirst *Incidence of reported reaction between 3% and 9%.
Those reactions occurring in less than 3% of the patients are unmarked. In patients taking NSAIDs, the following adverse experiences have also been reported in approximately 1% to 10% of patients. Gastrointestinal (GI) Experiences, including : flatulence, gross bleeding/perforation, GI ulcers (gastric/duodenal), vomiting General : abnormal renal function, anemia, elevated liver enzymes, increased bleeding time, rashes The following are additional adverse experiences reported in <1% of patients taking naproxen during clinical trials.
Gastrointestinal : pancreatitis, vomiting Hepatobiliary: jaundice Hemic and Lymphatic : melena, thrombocytopenia, agranulocytosis Nervous System : inability to concentrate Dermatologic : skin rashes
6.2Postmarketing Experience The following adverse reactions have been identified during post approval use of naproxen. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. The following are additional adverse experiences reported in <1% of patients taking naproxen during clinical trials and through postmarketing reports.
Those adverse reactions observed through postmarketing reports are italicized. Body as a Whole : anaphylactoid reactions, angioneurotic edema, menstrual disorders, pyrexia (chills and fever) Cardiovascular : congestive heart failure, vasculitis, hypertension, pulmonary edema Gastrointestinal : inflammation, bleeding (sometimes fatal, particularly in the elderly), ulceration, perforation and obstruction of the upper or lower gastrointestinal tract. Esophagitis, stomatitis, hematemesis, colitis, exacerbation of inflammatory bowel disease (ulcerative colitis, Crohn’s disease).
Hepatobiliary : abnormal liver function tests, hepatitis (some cases have been fatal) Hemic and Lymphatic: eosinophilia, leucopenia, granulocytopenia, hemolytic anemia, aplastic ane…
🔄 Drug Interactions ▾
7 DRUG INTERACTIONS See Table 1 for clinically significant drug interactions with naproxen. Table 1: Clinically Significant Drug Interactions with naproxen Drugs That Interfere with Hemostasis Clinical Impact: Naproxen and anticoagulants such as warfarin have a synergistic effect on bleeding. The concomitant use of naproxen and anticoagulants have an increased risk of serious bleeding compared to the use of either drug alone.
Serotonin release by platelets plays an important role in hemostasis. Case-control and cohort epidemiological studies showed that concomitant use of drugs that interfere with serotonin reuptake and an NSAID may potentiate the risk of bleeding more than an NSAID alone. Intervention: Monitor patients with concomitant use of NAPROXEN Tablets, Naproxen Delayed-Release Tablets, or NAPROXEN SODIUM with anticoagulants (e.g., warfarin), antiplatelet agents (e.g., aspirin), selective serotonin reuptake inhibitors (SSRIs), and serotonin norepinephrine reuptake inhibitors (SNRIs) for signs of bleeding [see Warnings and Precautions (5.12) ].
Aspirin Clinical Impact: A pharmacodynamic (PD) study has demonstrated an interaction in which lower dose naproxen (220mg/day or 220mg twice daily) interfered with the antiplatelet effect of low-dose immediate-release aspirin, with the interaction most marked during the washout period of naproxen (see
12.2Pharmacodynamics ) . There is reason to expect that the interaction would be present with prescription doses of naproxen or with enteric-coated low-dose aspirin; however, the peak interference with aspirin function may be later than observed in the PD study due to the longer washout period. Controlled clinical studies showed that the concomitant use of NSAIDs and analgesic doses of aspirin does not produce any greater therapeutic effect than the use of NSAIDs alone.
In a clinical study, the concomitant use of an NSAID and aspirin was associated with a significantly increased incidence of GI adverse reactions as compared to use of the NSAID alone [see Warnings and Precautions (5.2) ]. Intervention: Because there may be an increased risk of cardiovascular events following discontinuation of naproxen due to the interference with the antiplatelet effect of aspirin during the washout period, for patients taking low-dose aspirin for cardioprotection who require intermittent analgesics, consider use of an NSAID that does not interfere with the antiplatelet effect of aspirin, or non NSAID analgesics where appropriate.
Concomitant use of NAPROXEN Tablets, Naproxen Delayed-Release Tablets, or NAPROXEN SODIUM and analgesic doses of aspirin is not generally recommended because of the increased risk of bleeding [see Warnings and Precautions (5.12) ]. NAPROXEN Tablets, Naproxen Delayed-Release Tablets, or NAPROXEN SODIUM are not substitute for low dose aspirin for cardiovascular protection. ACE Inhibitors, Angiotensin Receptor Blockers, and Beta-Blockers Clinical Impact: NSAIDs may diminish the antihypertensive effect of angiotensin converting enzyme (ACE) inhibitors, angiotensin receptor blockers (ARBs), or beta-blockers (including propranolol).
In patients who are elderly, volume-depleted (including those on diuretic therapy), or have renal impairment, co-administration of an NSAID with ACE inhibitors or ARBs may result in deterioration of renal function, including possible acute renal failure. These effects are usually reversible. Intervention: During concomitant use of NAPROXEN Tablets, Naproxen Delayed-Release Tablets, or NAPROXEN SODIUM and ACE-inhibitors, ARBs, or beta-blockers, monitor blood pressure to ensure that the desired blood pressure is obtained.
During concomitant use of NAPROXEN Tablets, Naproxen Delayed-Release Tablets, or NAPROXEN SODIUM and ACE-inhibitors or ARBs in patients who are elderly, volume-depleted, or have impaired renal function, monitor for signs of worsening renal function [see Warnings and Precautions (5.6) ]. When these drugs are administered concomitantly…
👥 Use in Specific Populations ▾
8 USE IN SPECIFIC POPULATIONS
8.1Pregnancy Risk Summary Use of NSAIDs, including NAPROXEN Tablets, Naproxen Delayed-Release Tablets, and NAPROXEN SODIUM, 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 NAPROXEN Tablets, Naproxen Delayed-Release Tablets, or NAPROXEN SODIUM use between about 20 and 30 weeks of gestation, and avoid NAPROXEN Tablets, Naproxen Delayed-Release Tablets, and NAPROXEN SODIUM 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 NAPROXEN Tablets, Naproxen Delayed-Release Tablets, and NAPROXEN SODIUM, 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 NAPROXEN Tablets, Naproxen Delayed-Release Tablets, and NAPROXEN SODIUM, 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 NAPROXEN Tablets, Naproxen Delayed-Release Tablets, or NAPROXEN SODIUM treatment extends beyond 48 hours, consider monitoring with ultrasound for oligohydramnios. If oligohydramnios occurs, discontinue NAPROXEN Tablets, Naproxen Delayed-Release Tablets, and NAPROXEN SODIUM, and follow up according to clinical practice (see Data).
Labor or Delivery There are no studies on the effects of NAPROXEN Tablets, Naproxen Delayed-Release Tablets, or NAPROXEN SODIUM 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 intracra…
🆘 Overdosage ▾
10 OVERDOSAGE Symptoms following acute NSAID overdosages have been typically limited to lethargy, drowsiness, nausea, vomiting, and epigastric pain, which have been generally reversible with supportive care. Gastrointestinal bleeding has occurred. Hypertension, acute renal failure, respiratory depression, and coma have occurred, but were rare [see Warnings and Precautions ( 5.1 , 5.2 )].
Because naproxen sodium may be rapidly absorbed, high and early blood levels should be anticipated. A few patients have experienced convulsions, but it is not clear whether or not these were drug-related. It is not known what dose of the drug would be life threatening. [see Warnings and Precautions ( 5.1 , 5.2 , 5.4 , 5.6 )].
Manage patients with symptomatic and supportive care following an NSAID overdosage. There are no specific antidotes. Consider emesis and/or activated charcoal (60 to 100 grams in adults, 1 to 2 grams per kg of body weight in pediatric patients) and/or osmotic cathartic in symptomatic patients seen within four hours of ingestion or in patients with a large overdosage (5 to 10 times the recommended dosage).
Forced diuresis, alkalinization of urine, hemodialysis, or hemoperfusion may not be useful due to high protein binding. For additional information about overdosage treatment contact a poison control center (1-800-222-1222).
🧬 Clinical Pharmacology ▾
12 CLINICAL PHARMACOLOGY
12.1Mechanism of Action Naproxen has analgesic, anti-inflammatory, and antipyretic properties. NAPROXEN SODIUM (naproxen sodium) has been developed as a more rapidly absorbed formulation of naproxen for use as an analgesic. The mechanism of action of naproxen, like that of other NSAIDs, is not completely understood but involves inhibition of cyclooxygenase (COX-1 and COX-2).
Naproxen is a potent inhibitor of prostaglandin synthesis in vitro . Naproxen concentrations reached during therapy have produced in vivo effects. Prostaglandins sensitize afferent nerves and potentiate the action of bradykinin in inducing pain in animal models.
Prostaglandins are mediators of inflammation. Because naproxen is an inhibitor of prostaglandin synthesis, its mode of action may be due to a decrease of prostaglandins in peripheral tissues.
12.2Pharmacodynamics In a healthy volunteer study, 10 days of concomitant administration of naproxen 220 mg once-daily with low-dose immediate-release aspirin (81 mg) showed an interaction with the antiplatelet activity of aspirin as measured by % serum thromboxane B2 inhibition at 24 hours following the day 10 dose [98.7% (aspirin alone) vs 93.1% (naproxen and aspirin)]. The interaction was observed even following discontinuation of naproxen on day 11 (while aspirin dose was continued) but normalized by day 13. In the same study, the interaction was greater when naproxen was administered 30 minutes prior to aspirin [98.7% vs 87.7%] and minimal when aspirin was administered 30 minutes prior to naproxen [98.7% vs 95.4%].
Following administration of naproxen 220 mg twice-daily with low-dose immediate-release aspirin (first naproxen dose given 30 minutes prior to aspirin), the interaction was minimal at 24 h following day 10 dose [98.7% vs 95.7%]. However, the interaction was more prominent after discontinuation of naproxen (washout) on day 11 [98.7% vs 84.3%] and did not normalize completely by day 13 [98.5% vs 90.7%]. [see Drug Interactions (7) ].
12.3Pharmacokinetic Naproxen and naproxen sodium are rapidly and completely absorbed from the gastrointestinal tract with an in vivo bioavailability of 95%. The different dosage forms of NAPROXEN are bioequivalent in terms of extent of absorption (AUC) and peak concentration (Cmax); however, the products do differ in their pattern of absorption. These differences between naproxen products are related to both the chemical form of naproxen used and its formulation.
Even with the observed differences in pattern of absorption, the elimination half-life of naproxen is unchanged across products ranging from 12 to 17 hours. Steady-state levels of naproxen are reached in 4 to 5 days, and the degree of naproxen accumulation is consistent with this half-life. This suggests that the differences in pattern of release play only a negligible role in the attainment of steady-state plasma levels.
Absorption NAPROXEN Tablets/NAPROXEN SODIUM: After administration of NAPROXEN Tablets, peak plasma levels are attained in 2 to 4 hours. After oral administration of NAPROXEN SODIUM, peak plasma levels are attained in 1 to 2 hours. The difference in rates between the two products is due to the increased aqueous solubility of the sodium salt of naproxen used in NAPROXEN SODIUM.
Naproxen Delayed-Release Tablets: Naproxen Delayed-Release Tablets is designed with a pH-sensitive coating to provide a barrier to disintegration in the acidic environment of the stomach and to lose integrity in the more neutral environment of the small intestine. The enteric polymer coating selected for Naproxen Delayed-Release Tablets dissolves above pH 6. When Naproxen Delayed-Release Tablets was given to fasted subjects, peak plasma levels were attained about 4 to 6 hours following the first dose (range: 2 to 12 hours).
An in vivo study in man using radiolabeled Naproxen Delayed- Release Tablets demonstrated that Naproxen Delayed-Release Tablets dissolves primarily in the small intestine…
📦 How Supplied / Storage and Handling ▾
16 HOW SUPPLIED/STORAGE AND HANDLING Naproxen Delayed-Release Tablets 500 mg: white, oblong coated tablets imprinted with NPR EC 500 on one side. Packaged in light-resistant bottles of 100. Supplied as: NDC 90096-161-01 100’s (bottle) Store at 15°C to 30°C (59°F to 86°F) in well-closed containers; dispense in light-resistant containers.
📋 Description ▾
11 DESCRIPTION Naproxen Delayed-Release Tablets are nonsteroidal anti-inflammatory drugs available as follows: Naproxen Delayed-Release Tablets are available as enteric-coated white tablets 500 mg of naproxen for oral administration. Naproxen is a propionic acid derivative related to the arylacetic acid group of nonsteroidal anti-inflammatory drugs. The chemical names for naproxen and naproxen sodium are (S)-6-methoxy-α-methyl-2-naphthaleneacetic acid and (S)-6-methoxy-α- methyl-2-naphthaleneacetic acid, sodium salt, respectively.
Naproxen has a molecular weight of 230.26 and a molecular formula of C H O . Naproxen and naproxen sodium have the following structures, respectively: Naproxen is an odorless, white to off-white crystalline substance. It is lipid-soluble, practically insoluble in water at low pH and freely soluble in water at high pH.
The octanol/water partition coefficient of naproxen at pH 7.4 is 1.6 to 1.8. Naproxen sodium is a white to creamy white, crystalline solid, freely soluble in water at neutral pH. The inactive ingredients in Naproxen Delayed-Release Tablets include: croscarmellose sodium, povidone and magnesium stearate.
The enteric coating dispersion contains methacrylic acid copolymer, talc, triethyl citrate, sodium hydroxide and purified water. The imprinting on the tablets is black ink. The dissolution of this enteric-coated naproxen tablet is pH dependent with rapid dissolution above pH 6.
There is no dissolution below pH 4. Description
💬 Medication Guide ▾
This Medication Guide has been approved by the U.S. Food and Drug Administration. Revised: July 2025 Medication Guide for Nonsteroidal Anti-inflammatory Drugs (NSAIDs) What is the most important information I should know about medicines called Nonsteroidal Anti-inflammatory Drugs (NSAIDs)?
NSAIDs can cause serious side effects, including: Increased risk of a heart attack or stroke that can lead to death. This risk may happen early in treatment and may increase: with increasing doses of NSAIDs with longer use of NSAIDs Do not take NSAIDs right before or after a heart surgery called a "coronary artery bypass graft (CABG)." Avoid taking NSAIDs after a recent heart attack, unless your healthcare provider tells you to. You may have an increased risk of another heart attack if you take NSAIDs after a recent heart attack.
Increased risk of bleeding, ulcers, and tears (perforation) of the esophagus (tube leading from the mouth to the stomach), stomach and intestines: anytime during use without warning symptoms that may cause death The risk of getting an ulcer or bleeding increases with: past history of stomach ulcers, or stomach or intestinal bleeding with use of NSAIDs taking medicines called "corticosteroids", "anticoagulants", "SSRIs", or "SNRIs" increasing doses of NSAIDs longer use of NSAIDs smoking drinking alcohol older age poor health advanced liver disease bleeding problems NSAIDs should only be used: exactly as prescribed at the lowest dose possible for your treatment for the shortest time needed What are NSAIDs?
NSAIDs are used to treat pain and redness, swelling, and heat (inflammation) from medical conditions such as different types of arthritis, menstrual cramps, and other types of short-term pain. Who should not take NSAIDs? Do not take NSAIDs: if you have had an asthma attack, hives, or other allergic reaction with aspirin or any other NSAIDs. right before or after heart bypass surgery.
Before taking NSAIDS, tell your healthcare provider about all of your medical conditions, including if you: have liver or kidney problems have high blood pressure have asthma are pregnant or plan to become pregnant. Taking NSAIDs at about 20 weeks of pregnancy or later may harm your unborn baby. If you need to take NSAIDs for more than 2 days when you are between 20 and 30 weeks of pregnancy, your healthcare provider may need to monitor the amount of fluid in your womb around your baby.
You should not take NSAIDs after about 30 weeks of pregnancy. are breastfeeding or plan to breast feed. Tell your healthcare provider about all of the medicines you take, including prescription or over-the-counter medicines, vitamins or herbal supplements.NSAIDs and some other medicines can interact with each other and cause serious side effects. Do not start taking any new medicine without talking to your healthcare provider first.
What are the possible side effects of NSAIDs? NSAIDs can cause serious side effects, including: See "What is the most important information I should know about medicines called Nonsteroidal Anti-inflammatory Drugs (NSAIDs)?" new or worse high blood pressure heart failure liver problems including liver failure kidney problems including kidney failure low red blood cells (anemia) life-threatening skin reactions life-threatening allergic reactions Other side effects of NSAIDs include:stomach pain, constipation, diarrhea, gas, heartburn, nausea, vomiting, and dizziness.
Get emergency help right away if you get any of the following symptoms: shortness of breath or trouble breathing chest pain weakness in one part or side of your body slurred speech swelling of the face or throat Stop taking your NSAID and call your healthcare provider right away if you get any of the following symptoms: nausea more tired or weaker than usual diarrhea itching your skin or eyes look yellow indigestion or stomach pain flu-like symptoms vomit blood there is blood in your bowel movement or it is black and sticky like tar unusual weight gain skin rash o…