oxaprozin
Brand names: Daypro
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.
View all drug shortages →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.
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
Age Distribution
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
Reactions in Hospitalization Reports
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
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.
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.
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.
Common Questions
Can I take oxaprozin with aspirin?
What should I do if I experience heartburn while taking oxaprozin?
Can oxaprozin affect my blood pressure?
Is it safe to take oxaprozin if I have kidney problems?
Can oxaprozin cause allergic reactions?
How long does it take for oxaprozin to start working?
Can I drink alcohol while taking oxaprozin?
Does oxaprozin interact with other medications?
Can oxaprozin cause weight gain?
What are the symptoms of a stomach ulcer caused by oxaprozin?
What are the common side effects of oxaprozin?
Does oxaprozin interact with other medications?
What drug class is oxaprozin?
Is oxaprozin safe during pregnancy?
Is oxaprozin currently in shortage?
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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
Read our methodology — how this data is sourced, computed, and verified.
All federal data sources used on this page
- FDA Orange Book — approved drug products with therapeutic equivalence. accessdata.fda.gov/cder/ob
- FDA DailyMed — NIH-hosted drug labeling for FDA-approved meds. dailymed.nlm.nih.gov
- FDA Adverse Event Reporting System (FAERS) — post-marketing safety surveillance. fda.gov/drugs/faers
- NLM RxNorm — standardized clinical drug nomenclature. nlm.nih.gov/research/umls/rxnorm
- CMS Medicare Part B Drug Average Sales Price Files — federal drug pricing data. cms.gov/medicare/part-b-drugs/asp
- FDA Drug Shortages Database — current and resolved drug shortage tracking. accessdata.fda.gov/drugshortages