Daypro

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Daypro

Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Daypro

What is Daypro? Overview and Quick Facts

Property Description
Active ingredient Oxaprozin
Form Oral Tablet
Pharmacological class Nonsteroidal Anti-Inflammatory Drug (NSAID)
Common use (General) Relief of pain and inflammation
Origin Synthetic Propionic acid derivative

What Type of Medicine is Daypro (Oxaprozin)?

Daypro is a prescription-only medication whose active ingredient, Oxaprozin, classifies it as a Nonsteroidal Anti-Inflammatory Drug (NSAID). This compound is a synthetic propionic acid derivative and is supplied for oral use in the form of a tablet. It is a single-ingredient product, meaning its therapeutic effect stems solely from the Oxaprozin compound rather than a combination of different active agents. This classification confirms the drug's fundamental nature as a chemical agent developed to target inflammation. Daypro is specifically known among healthcare providers for its positioning as a single-agent NSAID intended for use in adults.


Why Is Oxaprozin Classified as an NSAID?

Oxaprozin is classified as an NSAID because it provides both anti-inflammatory and analgesic (pain-relieving) properties by affecting the body's inflammatory signaling. The general purpose of this medication is to interrupt the biochemical pathway that generates key inflammatory chemicals called prostaglandins. Oxaprozin's actions include anti-inflammatory and analgesic effects. By exerting a systemic effect, the medication helps to alleviate associated symptoms across the body. The resulting general therapeutic benefit is the sustained reduction of swelling, tenderness, and overall pain linked to inflammatory conditions. Furthermore, Oxaprozin's long half-life distinguishes it from many shorter-acting NSAIDs. This unique property of the active ingredient, with an elimination half-life that can extend to approximately 50 to 60 hours, is clinically recognized as supporting less frequent dosing.

Regulatory References

  1. DailyMed - NIH

What side effects are possible with Daypro?

Daypro: Possible side effects and safety information

Daypro (oxaprozin) is a nonsteroidal anti-inflammatory drug (NSAID) and is associated with specific, serious safety risks documented by regulatory authorities, requiring careful consideration before use.

Serious Adverse Event Risks

Cardiovascular Thrombotic Events: The drug carries a warning regarding an increased risk of serious cardiovascular thrombotic events, including myocardial infarction (MI) and stroke, which can be fatal. This risk may begin early in treatment and may increase with the duration of use and dose. Daypro is contraindicated for treating pain immediately before or after Coronary Artery Bypass Graft (CABG) surgery.

Gastrointestinal (GI) Events: NSAIDs, including Daypro, increase the risk of serious GI adverse events such as bleeding, ulceration, and perforation of the stomach or intestines, which can be fatal. These events can occur without warning symptoms at any time. Elderly patients and those with a prior history of GI disease are at greater risk.

Organ-Specific and Severe Reactions

Additional safety warnings cover risks of new or worsening hypertension and heart failure (leading to edema), hepatotoxicity (including liver failure), and renal toxicity (including acute renal failure). The drug is contraindicated in patients who have experienced asthma, hives, or allergic reactions after taking aspirin or other NSAIDs.

Rare, but serious, hypersensitivity events include anaphylactic reactions and severe cutaneous adverse reactions (SCARs) such as Stevens-Johnson Syndrome (SJS), Toxic Epidermal Necrolysis (TEN), and Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS). Discontinuation is required at the first sign of rash or other hypersensitivity.

Other Documented Adverse Reactions

In clinical trials, the most common adverse reactions (incidence ge 3%) included dyspepsia, nausea, diarrhea, constipation, and rash.

Safety Considerations for Specific Populations

  • Pregnancy: Use should be limited between 20 to 30 weeks gestation due to the risk of oligohydramnios/fetal renal dysfunction, and avoided at 30 weeks gestation and later due to risks including premature closure of the fetal ductus arteriosus.
  • Elderly: Patients 65 years and older may be more susceptible to serious GI events and other adverse effects.

Overdose and Emergency Response

Overdosage with Daypro (Oxaprozin), a Nonsteroidal Anti-Inflammatory Drug (NSAID), may present with documented clinical manifestations that typically involve the gastrointestinal and central nervous systems. Initial signs often include drowsiness, lack of energy, upset stomach, vomiting, and stomach pain. More severe gastrointestinal signs may involve the appearance of bloody or black, tarry stools or the vomiting of material resembling coffee grounds.

The official regulatory profile describes the potential for severe, though rare, outcomes. These include seizures, the onset of coma (loss of consciousness), and systemic complications such as acute renal failure, hypertension, and respiratory depression. Management of overdosage is strictly symptomatic and supportive, as no specific antidote is known to exist. Procedures such as the administration of activated charcoal may be considered for large or recent ingestions. Specific dosage guidelines for activated charcoal in pediatric patients are also noted in the regulatory documentation.

Regulatory guidance mandates specific actions when an overdose is suspected. Contacting the Poison Control Helpline is required for immediate guidance. Furthermore, urgent medical attention is required immediately if the affected individual collapses, experiences a seizure, has difficulty breathing, or cannot be awakened. These scenarios constitute the mandated threshold for seeking emergency services.

Therapeutic Uses of Daypro

What Daypro treats: Main Uses and Benefits

Daypro (Oxaprozin) is utilized for the long-term symptomatic management of chronic inflammatory and degenerative joint diseases. Its therapeutic focus is delivering relief in situations where symptoms interfere with daily stability. The medication is considered relevant for easing symptoms associated with three main conditions: osteoarthritis (OA), rheumatoid arthritis (RA), and juvenile rheumatoid arthritis (JRA) in pediatric patients aged six and older. It is applied in conditions marked by continuing inflammation.

Daypro is relevant for easing symptom clusters involving mild to moderate joint pain, tenderness, and swelling. It provides support that helps ease the overall burden of these distressing manifestations. Furthermore, by contributing to the reduction of inflammation, the medication helps reduce mobility-limiting symptoms such as prolonged morning stiffness.

“Supportive relief for chronic joint discomfort is a core application of this medication.”

This action assists with maintaining functional stability throughout daily routines and provides supportive relief during symptomatic periods.


Quick Fact: Relief for Joint Inflammation and Mild to Moderate Pain

Regulatory References

  1. NIH DailyMed Label for Oxaprozin

Eligibility and Restrictions for Use

Daypro (oxaprozin) eligibility is strictly defined by government regulatory documents, focusing on patient population, age, pre-existing conditions, and physiological states.

Contraindicated Populations (Must Not Use)

Use of Daypro is contraindicated in the following patient groups, as they are explicitly prohibited by official labeling:

  • Patients with a known hypersensitivity (severe allergic reaction) to oxaprozin or any component of the drug product.
  • Individuals with a history of aspirin-sensitive asthma or other allergic-type reactions after taking aspirin or other Nonsteroidal Anti-Inflammatory Drugs (NSAIDs).
  • Patients in the setting of coronary artery bypass graft (CABG) surgery for the treatment of peri-operative pain.

Eligibility and Conditional Use

The medicine is approved for adults and pediatric patients aged 6 years and older for specific arthritic conditions. However, use is restricted or requires caution in several populations:

  • Pediatric Limitation: Safety and effectiveness have not been established for children younger than 6 years of age.
  • Geriatric Use: Caution must be exercised in older adults (65 years and older), as they are at greater risk for serious NSAID-associated adverse reactions.
  • Organ/Condition Restriction: Use must be avoided in patients with advanced renal disease or severe heart failure unless the expected benefit outweighs the risk of worsening the underlying condition. Volume depletion (such as dehydration) must be corrected prior to initiation.
  • Pregnancy Status: Daypro must be avoided starting at 30 weeks gestation and later in pregnancy. Between 20 and 30 weeks gestation, use must be limited to the lowest effective dose for the shortest possible duration.

What should I know about interactions with other medicines?

Daypro (oxaprozin), like other nonsteroidal anti-inflammatory drugs (NSAIDs), can interact with several medications and substances, increasing the risk of side effects or altering the effectiveness of either drug.

Important Drug Interactions

Consult your healthcare provider about all prescription and non-prescription medicines, supplements, and herbal products you take, especially those listed below:

  • Anticoagulants and Antiplatelet Drugs: Combining Daypro with anticoagulants (e.g., warfarin) or antiplatelet drugs (e.g., aspirin) increases the risk of serious bleeding. Concomitant use with analgesic doses of aspirin is generally not recommended, though Daypro is not a substitute for low-dose aspirin used for cardiovascular protection.
  • Other NSAIDs: Avoid using Daypro with other NSAIDs or salicylates due to a heightened risk of gastrointestinal toxicity, including ulcers and bleeding, without increased therapeutic benefit.
  • Blood Pressure Medications: Daypro may reduce the effectiveness of blood pressure drugs such as ACE inhibitors, Angiotensin Receptor Blockers (ARBs), and beta-blockers. In elderly or volume-depleted patients taking ACE inhibitors or ARBs, there is an increased risk of worsening kidney function.
  • Diuretics: Daypro may diminish the diuretic and blood pressure-lowering effects of diuretics (water pills).
  • Lithium: Daypro can increase the blood concentration of lithium, which may lead to toxicity. Plasma lithium levels should be closely monitored.
  • Other Medications: Use with methotrexate or cyclosporine may increase the risk of toxicity for those medications. Daypro can also interfere with certain urine screening tests for benzodiazepines, potentially causing a false-positive result. Alcohol and tobacco use also increase the risk of gastrointestinal bleeding while taking Daypro.

Regular monitoring and dose adjustments may be necessary when Daypro is used with these or other interacting medications.

Mechanism of Action

Pharmacodynamic Mechanism of Oxaprozin

The action of Oxaprozin is fundamentally characterized by the non-selective inhibition of the Cyclooxygenase ( COX) enzymes, targeting both the constitutive COX-1 and inducible COX-2 isoforms. This molecular interaction competitively prevents COX from converting arachidonic acid into prostanoids, thereby halting the biosynthesis of key inflammatory mediators like prostaglandins. This suppression of prostanoid synthesis causes two main physiological consequences.

First, the resulting decrease in local prostaglandin concentration diminishes the chemical excitability of peripheral sensory nerve endings (nociceptors), which alters local and central nociceptive signaling. Second, the mechanism influences the hypothalamic center, modulating the regulation of specific physiological set-points. However, the COX-1 inhibition also functionally restricts the production of homeostatic prostanoids essential for regulatory processes. This action limits the physiological support for gastrointestinal mucosal integrity and the regulation of renal vascular tone.

Dosage and Administration Information

Daypro (oxaprozin) is administered exclusively by the oral route as a 600 mg film-coated tablet. For proper use, the tablet must be swallowed whole and should not be crushed, divided, or chewed, which is necessary to maintain its intended administration characteristics. The medication can be taken without regard to meals, as food does not alter the total absorption of the active ingredient.

The general principle of use requires employing the lowest effective dose for the shortest duration that aligns with individual patient treatment goals. For adults with osteoarthritis or rheumatoid arthritis, the standard daily dose is 1200 mg taken once daily. In cases where a rapid onset of action is important, therapy may begin with a single loading dose of up to 1800 mg. On a chronic basis, the maximum recommended total daily dose for adults is 1800 mg, which may be administered in divided doses. Dosage adjustments are individualized based on the patient's response to initial therapy.

Specific usage rules apply to certain populations. Dosing for Juvenile Rheumatoid Arthritis (JRA) in patients aged 6 to 16 years is determined by body weight, with daily doses ranging from 600 mg to 1200 mg. Furthermore, patients with severe renal impairment or those undergoing dialysis should initiate therapy at the lower dose of 600 mg once daily and may only increase cautiously with close monitoring. Due to its inherent characteristics, the drug's full therapeutic effect may take several days or more to become fully apparent.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Daypro (Oxaprozin)

Evidence for Use in Osteoarthritis (OA)

The research for Daypro (oxaprozin) in the context of osteoarthritis is built upon Randomized Controlled Trials (RCTs). These studies were active-controlled clinical trials applied in research contexts involving adult patients with osteoarthritis of large joints. The outcomes measured in these studies included joint pain intensity, the duration of morning stiffness, and overall daily functioning or activity level.

Studies reported measurements of changes during the study period in these outcomes related to physical discomfort. Findings describe patterns observed in the studies regarding the evolution of symptoms associated with active arthritis. This research provides context regarding how symptoms change over time.

Evidence for Use in Rheumatoid Arthritis (RA)

For rheumatoid arthritis (RA), the evidence includes both Placebo-Controlled Trials and Active-Controlled Clinical Trials. Studies were conducted during periods of increased symptom activity in adult patients with active rheumatoid arthritis. Research examined outcomes linked to inflammatory or irritative states, such as the number of tender and swollen joints, alongside outcomes reflecting daily functioning like morning stiffness and grip strength. The research monitored both physician assessments and patient-reported outcomes describing perceived discomfort over defined time intervals.

Studies reported measurements of changes during the study period in objective inflammatory signs and subjective discomfort levels compared to control groups. Reported outcomes described patterns in joint tenderness and swelling counts measured within the study durations.

Research Gaps and Areas of Uncertainty

Follow-up durations were limited in many of the key trials, meaning there is limited information for long-term outcomes of using Daypro over multiple years. Furthermore, the research explored short-term symptom changes, and long-term effects are not fully established regarding potential impact on disease progression.

The evidence base for Juvenile Rheumatoid Arthritis (JRA) relies primarily on extrapolation of findings from adult studies, supported by dedicated pharmacokinetic (PK) studies in pediatric patients aged six and older. Direct clinical efficacy trials against placebo or an active comparator in children are sparse, meaning data for certain groups remain insufficient and research describing the full range of long-term outcomes are still emerging.

Key Studies & References

  1. OXAPROZIN - DailyMed (Official Labeling and Regulatory Information)
  2. A multicentre double-blind comparison of oxaprozin aspirin therapy on rheumatoid arthritis

Frequently Asked Questions (FAQ)

Common questions about Daypro (FAQ)

Q: Is Daypro the same type of medicine as ibuprofen or naproxen?

Daypro's active ingredient, oxaprozin, belongs to the same general category of medicine as ibuprofen and naproxen, which is the nonsteroidal anti-inflammatory drug (NSAID) class. This classification is consistent with how the drug works to reduce pain and inflammation.

Q: Is Daypro generally prescribed for short-term or long-term use?

Official guidance emphasizes using the lowest effective dose for the shortest duration necessary to meet treatment goals. This principle is consistent with regulatory efforts to manage the potential risks of adverse events, particularly those related to the heart and stomach.

Q: Is Daypro a generic or a brand-name drug?

Daypro is the original brand name for the active ingredient oxaprozin. Oxaprozin is the generic name for the compound. The Food and Drug Administration (FDA) has approved various generic versions of oxaprozin.

Q: Does Daypro cause weight gain or fluid retention?

Official product information notes that the drug is associated with edema, which is the medical term for fluid retention. Official product labeling highlights that unexplained weight gain is a symptom that should be noted, as this can be associated with heart failure, a risk linked to this drug class.

Q: Is Daypro considered an opioid or a narcotic?

Daypro is classified as a nonsteroidal anti-inflammatory drug (NSAID). The medication is not an opioid, nor is it classified as a narcotic or a federally controlled substance by government health authorities.

Q: How is Daypro different from other NSAIDs?

Regulatory documents note that the active ingredient, oxaprozin, has a particularly long elimination half-life compared to many other nonsteroidal anti-inflammatory drugs (NSAIDs). This pharmacological property is what enables the drug to be dosed just once daily.

Q: Are there specific medical warnings or boxed warnings for Daypro?

Yes, official regulatory labels contain a Boxed Warning (or Black Box Warning). This warning highlights the risk of serious cardiovascular (CV) thrombotic events, such as heart attack and stroke, and serious gastrointestinal (GI) adverse events, including bleeding and ulcers.

Q: Is Daypro addictive or habit-forming?

Regulatory agencies confirm that oxaprozin is not a federally controlled substance. It is therefore not classified as an addictive or habit-forming drug.

Q: What kind of monitoring (blood tests) is sometimes needed while taking Daypro?

Regulatory labeling indicates that periodic laboratory monitoring may be part of the care plan for patients using the medication long-term. This typically involves checks such as a complete blood count (CBC) and a chemistry profile to monitor for potential risks related to the liver, kidneys, and gastrointestinal system.

Q: Is there evidence of Daypro being used during pregnancy or breastfeeding?

Official sources state that while oxaprozin is expected to be excreted in human milk, the amount of the drug in breast milk has not been formally evaluated. Its use during late pregnancy is generally avoided due to the potential risk of fetal kidney problems.

Q: Is it common to feel tired or dizzy after starting Daypro?

Official drug information lists dizziness and drowsiness (also called somnolence) as known possible adverse reactions. These effects are classified as central nervous system (CNS) effects.

Q: What happens if I miss a scheduled dose of Daypro?

Official patient information states that a double dose should not be taken to make up for a missed dose. The standard direction is to resume the regular schedule.

Q: Are there any limitations on driving while taking Daypro?

The regulatory label notes that the medication may cause central nervous system (CNS) effects such as dizziness and somnolence (drowsiness). These potential effects are important to recognize.

Q: Is it normal to experience increased sun sensitivity with Daypro?

Photosensitivity is an adverse reaction that has been associated with oxaprozin. Official information from clinical trials noted an increased incidence of rash on skin exposed to sunlight.

Q: Is Daypro known to cause sleep disturbances (insomnia)?

Yes, disturbance of sleep, including insomnia, is listed as a known adverse reaction in the official product information.

Q: Has Daypro been recalled or withdrawn from the market?

While the drug itself has not been withdrawn from the market by regulatory authorities, individual lots of oxaprozin products have been subject to recall for issues such as not conforming to specific manufacturing practices (cGMP).

Q: Can Daypro be taken with pain relievers like Tylenol (acetaminophen)?

According to drug interaction information, combining oxaprozin with acetaminophen may increase the risk or severity of adverse effects.

Q: Why do official documents mention the lowest effective dose for Daypro?

Official documents stress the use of the lowest effective dose to minimize the potential risk of serious adverse events. Specifically, this is meant to reduce the potential for cardiovascular events (like heart attack) and gastrointestinal events (like bleeding and ulcers).

Q: What should be done in case of a suspected overdose of Daypro?

Official patient information states that a poison control center should be contacted immediately in the event of a suspected overdose. Symptoms can include drowsiness, lack of energy, or an upset stomach.

Q: What are the inactive ingredients in Daypro?

The inactive ingredients in the original Daypro oral caplets are listed in the official product description and include microcrystalline cellulose, magnesium stearate, polacrilin potassium, starch, polyethylene glycol, and titanium dioxide, among others.

How should Daypro be stored and disposed of?

How to Store and Dispose of Daypro (Oxaprozin)

Daypro tablets must be stored in a closed container at controlled room temperature, specifically between 20 C and 25 C (68 F to 77 F). Storage must maintain the product's stability by protecting it from freezing, excessive heat, moisture, and direct light. The medicine must always be stored out of the reach of children.

Disposal Requirements

For unused or expired Daypro, disposal should follow any specific instructions provided in the prescription labeling. If no specific instructions or drug take-back programs are available, the medicine must not be flushed down a toilet or sink. Instead, it should be mixed with an unappealing substance, sealed in a container, and placed in the household trash.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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