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oxaprozin

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Brand names: Daypro

Nonsteroidal Anti-Inflammatory Drug (NSAID) Rx

Oxaprozin (Daypro) is a nonsteroidal anti-inflammatory drug (NSAID). It helps to reduce pain and swelling.

Drug Shortage Alert

oxaprozin is currently listed as to be discontinued by the FDA. Affected manufacturer: Hospira, Inc., a Pfizer Company.

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Drug Pricing (NADAC)

Generic Price

$0.45/unit

Generic Available

Yes (3 manufacturers)

Pricing data from NADAC (CMS), effective December 18, 2024. Compare all drug costs →

What it does

This medicine can help with the symptoms of osteoarthritis, rheumatoid arthritis, and juvenile rheumatoid arthritis.

Common side effects

Constipation, Diarrhea, Upset stomach

Key warnings

NSAIDs like oxaprozin can increase your risk of heart problems like heart attack and stroke.

How It Works

Oxaprozin works by reducing substances in the body that cause pain and swelling. It blocks the production of prostaglandins. Prostaglandins contribute to inflammation and pain.

How to Take It

Take oxaprozin once a day by mouth. The usual dose for adults is 1,200 mg (four 300 mg capsules). Children's doses are based on their weight, so follow your doctor's instructions carefully. Your doctor may adjust your dose to find what works best for you.

Pregnancy & Breastfeeding

Taking oxaprozin after 20 weeks of pregnancy may harm your baby. Avoid taking this medicine after 30 weeks of pregnancy. Talk to your doctor if you are pregnant or plan to become pregnant.

Missed Dose

If you miss a dose, take it as soon as you remember. If it is close to your next dose, skip the missed dose and continue with your regular schedule.

Storage

Keep the bottle closed tightly and store it at room temperature.

Side Effects (from patient reports)

Based on 1,442 FDA adverse event reports.

Allergic reaction to the drug
386
Drug not working
178
Pain
151
Feeling sick to your stomach
134
Headache
104
Joint pain
103
Long-term kidney disease
103
Tiredness
103
Shortness of breath
92
Feeling lightheaded
88

FDA Adverse Event Report Analysis

Detailed analysis of 2,050 reports from the FDA Adverse Event Reporting System (FAERS). Reports span 2003–2025.

Total Reports

2,050

Death-Related Reports

80

Hospitalization Reports

475

Top Indication

Product Used For Unknown Indication

Gender Distribution

Female 1,459 (75%)
Male 488 (25%)

Age Distribution

0–17 7
18–44 187
45–64 669
65–74 272
75+ 150

Most Reported Adverse Reactions (FAERS)

# Reaction Reports
1 DRUG HYPERSENSITIVITY 386
2 DRUG INEFFECTIVE 178
3 PAIN 151
4 NAUSEA 134
5 HEADACHE 104
6 ARTHRALGIA 103
7 CHRONIC KIDNEY DISEASE 103
8 FATIGUE 103
9 DYSPNOEA 91
10 DIZZINESS 88
11 DEPRESSION 85
12 PAIN IN EXTREMITY 82
13 RENAL FAILURE 80
14 RASH 76
15 HYPERTENSION 74

Reactions in Death Reports

DEATH 24
ACUTE KIDNEY INJURY 14
CHRONIC KIDNEY DISEASE 14
RENAL FAILURE 13
HYPERTENSION 11
ANXIETY 10
PAIN 10
FATIGUE 9
MYOCARDIAL INFARCTION 9
ASTHENIA 8

Reactions in Hospitalization Reports

PAIN 58
DYSPNOEA 50
NAUSEA 47
CHEST PAIN 45
HYPERTENSION 45
FALL 44
ANXIETY 42
DEPRESSION 41
DIZZINESS 38
BACK PAIN 37

Source: FDA FAERS (Adverse Event Reporting System) FDA FAERS (Adverse Event Reporting System) Reports are voluntary and do not establish causation

Serious Warnings

NSAIDs like oxaprozin can increase your risk of heart problems like heart attack and stroke. This risk can happen early in treatment and may increase with longer use. You should not take this medicine if you are having heart bypass surgery. NSAIDs also increase the risk of stomach and intestine problems like bleeding and ulcers, which can be fatal. Older adults and people with a history of stomach ulcers are at higher risk.

Known Drug Interactions

moderate furosemide

Diuretics Clinical Impact: Clinical studies, as well as post-marketing observations, showed that NSAIDs reduced the natriuretic effect of loop diuretics (e.g., furosemide) and thiazide diuretics in some patients. In such high risk patients, monitor for signs of worsening renal function ( 7 ) Diuretics : NSAIDs can reduce natriuretic effect of furosemide and thiazide diuretics.

Mechanism: This pain reliever can interfere with how your water pill works to remove salt and fluid from your body. This can make the water pill less effective and might hurt your kidneys.

What to do: Your doctor should check your kidney function regularly while you are taking these medicines. Watch for signs of swelling or weight gain from fluid buildup.

Methotrexate Clinical Impact: Concomitant use of NSAIDs and methotrexate may increase the risk for methotrexate toxicity (e.g., neutropenia, thrombocytopenia, renal dysfunction) because NSAID administration may result in increased plasma levels of methotrexate, especially in patients receiving high doses of methotrexate. Intervention: During concomitant use of COXANTO and methotrexate, monitor patients for methotrexate toxicity.

Mechanism: Oxaprozin can cause methotrexate to build up in your blood to dangerous levels by making it harder for your body to clear the drug. This increases the risk of serious side effects like low blood cell counts or kidney problems.

What to do: Your doctor should monitor you closely for signs of methotrexate toxicity while you are taking both medications.

moderate diflunisal

NSAIDs and Salicylates Clinical Impact: Concomitant use of oxaprozin with other NSAIDs or salicylates (e.g., diflunisal, salsalate) increases the risk of GI toxicity, with little or no increase in efficacy [ see Warnings and Precautions (5.2) ] .

Mechanism: Taking two similar pain relievers together increases the risk of stomach damage without providing any extra pain relief. This can lead to serious issues like stomach ulcers or bleeding.

What to do: Avoid taking these two medications at the same time to prevent unnecessary damage to your digestive system.

moderate warfarin

Table 3: Drugs that Can Increase the Risk of Bleeding Drug Class Specific Drugs Anticoagulants argatroban, dabigatran, bivalirudin, desirudin, heparin, lepirudin Antiplatelet Agents aspirin, cilostazol, clopidogrel, dipyridamole, prasugrel, ticlopidine Non-steroidal Anti-Inflammatory Agents celecoxib, diclofenac, diflunisal, fenoprofen, ibuprofen, indomethacin, ketoprofen, ketorolac, mefenamic acid, naproxen, oxaprozin, piroxicam, sulindac Serotonin Reuptake Inhibitors citalopram, desvenlafaxine, duloxetine, escitalopram, fluoxetine, fluvoxamine, milnacipran, paroxetine, sertraline, venlafa...

Mechanism: Oxaprozin belongs to a group of drugs that can increase the risk of bleeding when paired with warfarin. This happens because both drugs make it much harder for the body to form a clot.

What to do: Your doctor should monitor your blood clotting time closely if you take both medications. Watch for signs of bleeding, such as blood in your urine or gums that bleed easily.

In the absence of data regarding potential interaction between pemetrexed and NSAIDs with longer half-lives (e.g., meloxicam, nabumetone), patients taking these NSAIDs should interrupt dosing for at least five days before, the day of, and two days following pemetrexed administration.

Mechanism: Both drugs belong to the same family of medicines called NSAIDs, and taking them together is like taking a double dose. This increases the risk of side effects like stomach ulcers and kidney problems without providing extra pain relief.

What to do: Avoid taking these two medications together. Talk to your doctor about using only one type of NSAID to manage your symptoms safely.

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Common Questions

Can I take oxaprozin with aspirin?
It is generally not recommended to take oxaprozin with aspirin because it may increase the risk of bleeding.
What should I do if I experience heartburn while taking oxaprozin?
Talk to your doctor. They may recommend an antacid or other medication to help with heartburn.
Can oxaprozin affect my blood pressure?
Yes, oxaprozin can increase blood pressure. Your doctor should monitor your blood pressure while you are taking this medicine.
Is it safe to take oxaprozin if I have kidney problems?
Talk to your doctor before taking oxaprozin if you have kidney problems. They may need to adjust your dose or monitor your kidney function more closely.
Can oxaprozin cause allergic reactions?
Yes, oxaprozin can cause allergic reactions. Seek emergency help if you experience symptoms such as hives, difficulty breathing, or swelling of the face, lips, tongue, or throat.
How long does it take for oxaprozin to start working?
It may take a few days to a week for oxaprozin to start working. Talk to your doctor if you do not notice any improvement in your symptoms.
Can I drink alcohol while taking oxaprozin?
It is best to avoid alcohol while taking oxaprozin, as it may increase the risk of stomach bleeding.
Does oxaprozin interact with other medications?
Yes, oxaprozin can interact with other medications, including blood thinners, blood pressure medications, and diuretics. Tell your doctor about all the medications you are taking.
Can oxaprozin cause weight gain?
Weight gain is not a common side effect of oxaprozin, but it can cause fluid retention, which may lead to swelling and a slight increase in weight.
What are the symptoms of a stomach ulcer caused by oxaprozin?
Symptoms of a stomach ulcer can include stomach pain, heartburn, nausea, vomiting, and black or bloody stools. See a doctor immediately if you have these symptoms.
What are the common side effects of oxaprozin?
The most commonly reported side effects of oxaprozin include Constipation, Diarrhea, Upset stomach, Nausea, Rash. Based on 1,442 FDA adverse event reports. Always consult your healthcare provider about potential side effects.
Does oxaprozin interact with other medications?
Yes, oxaprozin has 15 known drug interactions. Notable interactions include furosemide, methotrexate, diflunisal. Always inform your doctor about all medications you are taking.
What drug class is oxaprozin?
oxaprozin belongs to the Nonsteroidal Anti-Inflammatory Drug (NSAID) drug class. It requires a prescription (Rx). This medicine can help with the symptoms of osteoarthritis, rheumatoid arthritis, and juvenile rheumatoid arthritis.
Is oxaprozin safe during pregnancy?
Taking oxaprozin after 20 weeks of pregnancy may harm your baby. Avoid taking this medicine after 30 weeks of pregnancy. Always consult your healthcare provider before using any medication during pregnancy or breastfeeding.
Is oxaprozin currently in shortage?
Yes, oxaprozin is currently listed as to be discontinued by the FDA. Affected manufacturer: Hospira, Inc., a Pfizer Company. Visit the FDA Drug Shortages database for the latest updates.

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What the FDA Data Shows for oxaprozin

The FDA label for oxaprozin (sold under brand names such as Daypro) classifies it as a prescription-only medication in the Nonsteroidal Anti-Inflammatory Drug (NSAID) class. This medicine can help with the symptoms of osteoarthritis, rheumatoid arthritis, and juvenile rheumatoid arthritis. Official labeling lists 5 commonly reported side effects, including Constipation, Diarrhea, Upset stomach.

Post-market surveillance from the FDA Adverse Event Reporting System (FAERS) captures real-world experience. For this drug, FAERS contains 1,442 voluntary reports. The database also lists 15 documented drug interactions derived from FDA labeling, with the top-flagged interaction rated moderate severity. NADAC pricing from CMS shows a generic unit cost of $0.45.

Report counts do not establish causation — a FAERS entry documents a temporal association, not proof that the drug produced the outcome. Widely prescribed medications naturally accumulate more reports than niche therapies, so raw totals must be interpreted alongside total exposure. Shortage status, recall history, and patent information further shape supply and switching decisions. This page summarizes public FDA data for educational purposes only and is not a substitute for professional medical advice — always consult a licensed healthcare provider before starting, stopping, or changing any medication.

Data Sources

Drug labeling: FDA Drug Labels (SPL/DailyMed). Adverse events: FDA Adverse Event Reporting System (FAERS). Pricing: CMS National Average Drug Acquisition Cost (NADAC). Shortage status: FDA Drug Shortages Database.

FAERS reports are voluntary and do not establish causation. Drug interactions are derived from FDA labeling and clinical references. Always consult a healthcare professional before making medication decisions.

Last updated: October 6, 2025

All federal data sources used on this page