Ibuprofen

Article Author:
Vincent Trung Ngo
Article Editor:
Tushar Bajaj
Updated:
5/25/2019 4:47:03 PM
PubMed Link:
Ibuprofen

Indications

Ibuprofen is indicated and FDA-approved for use in the treatment of inflammatory diseases and rheumatoid disorders. The discovery of ibuprofen was spurred by finding an alternative non-corticosteroid treatment for rheumatoid arthritis. The disease was the initial impetus for the creation of what would eventually become known as ibuprofen; Dr. Stewart Adams OBE was the researcher whose work would lead to the discovery of the drug. Initially patented as 2-(4-isobutylphenyl) propionic acid in 1961 by Dr. Adams and John Nicholson, ibuprofen became and remains one of the most widely used NSAIDs worldwide.[1] Today, ibuprofen remains a monotherapy for managing of pain in rheumatoid disorders and inflammatory diseases, with a portion of research being centered around the creation of novel treatments or drugs. One such study involves the creation of NSAID and carbonic anhydrase inhibitor hybrid drugs for the management of pain in rheumatoid arthritis.[2]

Ibuprofen is also FDA-approved for use in mild to moderate pain. It is also available as an over-the-counter medication for pain, usually mild. Some common over-the-counter uses for ibuprofen are muscle sprains or strains, joint aches, pain from migraine, sore throat, and pain from cold or cases of flu. Some current research into the use of ibuprofen as a treatment for various sources of pain is typically focused on comparing treatment efficacy with other NSAIDs, with an emphasis on COX-2 inhibitors, or with novel treatment methods. A study comparing COX-2 inhibitors with ibuprofen after third molar removal showed no statistically significant differences in pain relief after 6, 8, and 12 hours, but a significant increase in rescue analgesia use in the ibuprofen group after 24 hours. A greater instance of nausea and vomiting was also noted in the ibuprofen group.[3] Postoperative pain is an area where ibuprofen has had demonstrated efficacy: In a randomized, double-blind study comparing IV ibuprofen and IV acetaminophen use for postoperative pain treatment in patients who underwent laparoscopic cholecystectomies, IV ibuprofen was shown to have lower pain scores and reduced opioid use in the first 24 hours following procedure compared to acetaminophen.[4] Lastly, a trial focusing on ibuprofen administration along with adjunct medication (baclofen, tizanidine, or metaxalone) or placebo for acute low back pain in an emergency department setting showed no improvement of functioning or pain by 1 week for any of the adjunct medication groups as compared to placebo.[2] Though ibuprofen is already widely accepted as an effective treatment for pain, research is continually seeking to add more effectiveness to the clinical use of ibuprofen in pain treatment.

Ibuprofen is also an FDA-approved antipyretic, used for fever reduction in both adults and children. The use of NSAIDs in treating fever is much more commonplace in pediatric patients, and much contemporary research centers around creating more efficacy in the usage of ibuprofen in treating pediatric fever. A literature review in 2017 showed little evidence to suggest superior efficacy between either ibuprofen or paracetamol in the treatment of fever. Six studies evaluated in the review showed a marginal difference with ibuprofen, but data remained insufficient to definitively state ibuprofen as producing better outcomes.[5] In a related study, refractory fevers responded more favorably to alternating acetaminophen and ibuprofen dosing compared with monotherapy of either, but only in those patients who respond positively after the first cycle.[6]

Dysmenorrhea is a medical condition involving pain during menstruation, which may vary in quality and timing. Dysmenorrhea may be either primary, which is usually mediated by prostaglandin production during ovulation, or secondary from another disease such as endometriosis or pelvic inflammatory disease.[7] NSAIDs are often a therapeutic choice, and FDA-approved to treat primary dysmenorrhea. A study exploring the use of cinnamon as an alternative treatment for primary dysmenorrhea study showed beneficial effects for pain reduction when compared with placebo, but a weaker effect than ibuprofen.[8] Transdermal drug delivery has been a topic of research in the context of ibuprofen and primary dysmenorrhea; a study investigated the use of essential oils as penetration enhancers for transdermal delivery of ibuprofen in patients with dysmenorrhea. This study was motivated by the known risk of GI bleeding and ulceration after oral NSAID usage and sought to investigate a potentially efficacious method of delivery that would decrease these risks. The study found that one of the essential oils, chuanxiong oil, did have positive effects on permeation and pain alleviation when administered with ibuprofen hydrogel.[9]

Ibuprofen and other NSAIDs are also FDA-approved to treat osteoarthritis, often after non-pharmacological measures such as weight loss and strengthening exercises are used. Adjunct medication usage has been explored, with a study showing promise with enhanced outcomes using acupuncture alongside topical ibuprofen compared with topical ibuprofen alone in patients with chronic knee pain due to osteoarthritis.[10] A comparative study between celecoxib and ibuprofen showed equal tolerance and efficacy between the two in the treatment of patients with knee osteoarthritis.[11]

The use of ibuprofen for treatment of gout attacks or flares has been long-researched, with Schweitz et al. in 1978 demonstrating the rapid improvement and symptom resolution in 10 patients with acute gouty arthritis after being treated with 2400mg of ibuprofen.[12] NSAIDs are commonly used as monotherapy for mild flares, and with colchicine as dual therapy for moderate or severe flares. Treatment of acute gout flares is an off-label use for ibuprofen.

NSAIDs and colchicine are also often used in the treatment of pericarditis, owing to NSAID’s anti-inflammatory and analgesic properties. Ibuprofen is one of the more well-documented NSAIDs in the treatment of pericarditis, with research into its effectiveness in treating and preventing multiple recurrences of idiopathic pericarditis compared with aspirin done in the CORP and CORP-2 trials starting in 2011. Findings showed no significant difference between treatment or prevention of idiopathic pericarditis between the two drugs.[13] Colchicine was shown in a 2014 review to be effective in reducing instances of recurrent pericarditis when used as adjunctive therapy to NSAIDs such as ibuprofen, aspirin, or indomethacin, but with limitations in the number of trials and in the statistical power of said trials.[14] Treatment of pericarditis with ibuprofen is an off-label use.

Intravenous ibuprofen has been FDA-approved for the closure of patent ductus arteriosus (PDA) in premature infants and has been shown to be as effective as indomethacin in treating PDA. Differences exist in the amount of systemic vasoconstriction and renal toxicity; likely due to less COX-1 selectivity, ibuprofen has been shown to have decreased rates of both outcomes.[15]

Since 2007, the USPSTF has recommended the use of aspirin and NSAIDs in preventing colorectal cancer in certain populations. In 2016, they updated this statement along with their 2009 statement for aspirin and NSAID use in preventing cardiovascular disease.[16] Although the recommendations are not for ibuprofen specifically, they still suggest a strong foundation of research that supports a potentially greater role of NSAIDs in the treatment and prevention of cancer. Burgeoning research on the efficacy of NSAIDs in the realm of cancer treatment, with some research specifically on the efficacy of ibuprofen, has shown promise. A review by Hil’ovska et al showed potential uses for NSAIDs in reducing cancer cell growth, movement, and invasion; in the induction of cancer cell-death; and in facilitating a lower dose of cytotoxic drug usage.[17] The studies reviewed were primarily focused on COX-2 inhibitors. For ibuprofen specifically, some studies have suggested a stronger anticancer effect than aspirin against breast and lung cancer,[18] as well as a reduction in the risk of breast cancer with ibuprofen or aspirin use.[19]

Similarly, Wawro et al have shown a potential indication for NSAID use, particularly aspirin and ibuprofen, during cancer treatment in colorectal cancer patients who are undergoing vincristine monotherapy. The purported role of NSAIDs is primarily in preventing chemoresistance by inhibiting proliferation of cancer-associated fibroblast formation. Vincristine stimulates the growth of cancer-associated fibroblasts via the secretion of tumor growth factors beta and interleukin-6; an inhibitive effect on this process was seen with aspirin and ibuprofen usage. Their research purports that the likely mechanism behind this involves NSAIDs affecting the rate of regulation of microtubule polymerization.[20]

Mechanism of Action

The primary mechanism of Ibuprofen, an NSAID, is through the inhibition of prostaglandin precursors. After a physiological or pathological stimulus, membrane phospholipids release arachidonic acid due to the enzyme phospholipase A2. Arachidonic acid then undergoes passage into one of three different enzymatic pathways: cyclooxygenase (COX), lipoxygenase (LOX), and cytochrome P450 (CYP450). The cyclooxygenase pathway converts arachidonic acid to prostaglandins, prostacyclins, and thromboxanes. The lipoxygenase pathway yields hydroxyeicosatetranoic acids (HETEs), leukotrienes, and lipoxins from arachidonic acid metabolism. Lastly, arachidonic acid is converted to HETEs and epoxyeicosatrienoic acids (EET) via the cytochrome P450 pathway.[17]

These metabolic pathways all create products that are referred to as eicosanoids, which are molecules that are involved in the intercellular and intracellular signaling processes of a variety of physiological processes: smooth muscle tone regulation, vascular permeability, transporter proteins, platelet aggregation, and cell proliferation. As in the case of cyclooxygenase pathway products, eicosanoids are also involved in autoimmunity, angiogenesis, atopy, inflammation, and cancer.[21]

In terms of the current indicated uses of ibuprofen, the cyclooxygenase pathway plays a prominent role. There are three distinct isoforms in the COX pathway: COX-1 (PGH synthase), COX-2, and COX-3. COX-1 is a constitutionally expressed isoform, with levels relatively stable in reaction to most physiologic or pathologic stimuli. In contrast, COX-2 expression has been shown to be highly inducible by mitogenic and inflammatory stimuli. Among these, the more well-known are transforming growth factor, fibroblast growth factor, vascular endothelial growth factor, and tumor necrosis factors. The function of COX-3 isoform is still largely unknown and remains a topic of contemporary research.[22][17] Inhibition of COX-1 and COX-2 pathways decreases the expression of prostaglandin precursors; this, in turn, lessens the degree of cellular response to pathologic or physiologic stimuli. It is by this mechanism that non-selective NSAIDs such as Ibuprofen derive their analgesic, antipyretic, and anti-inflammatory properties.[17] For ibuprofen specifically, COX-1 is inhibited approximately 2.5 times more potently than COX-2, which suggests implications into much research of the comparative efficacy of COX-2 selective inhibitors in treating diseases normally treated with ibuprofen.[13]

COX-2 aside from its well-known roles in inflammation has also been found to be constitutively expressed during early carcinogenesis.[8] Higher levels of COX-2 has also been demonstrated in several human tumors including breast, colorectal, esophageal, lung, and pancreatic.[17] The current findings on COX-2 and its various effects on cells suggest that the anticancer effects of NSAIDs such as Ibuprofen are due to COX-2 inhibition. Though the anticancer effects of COX-2 inhibition are well-documented, there is still some question as to the exact mechanism by which this occurs. Moreover, there is also evidence that other pathways may be involved in the anticancer and antitumor effects of NSAIDs, due to NSAID reducing cell survival in both COX-2 overexpressed as well as COX-2 deficient malignant cells.[23]

For the other 2 enzymatic pathways, a sizeable amount of research on their potential involvement in carcinogenesis has been conducted but the information is still limited. LOX isoforms, particularly 5-LOX, 12-LOX, and 15-LOX, have been discussed as potential contributors to tumor development and growth. 5-LOX is normally expressed only in immune cells and has been implicated in the early stages of colon cancer, carcinogenesis in oral cavity tissue, and in the expression of chronic myeloid leukemia.[24][25][26] 12-LOX has proangiogenic functions, as it controls G1/S-phase arrest via a dual process: regulation of Nf-kB, and inhibition of Akt and mitogen-activated protein kinases.[10] 15-LOX isoforms promote cell senescence and suppress cell cycle progression.[27]

Administration

Ibuprofen, an over-the-counter drug in most countries, is available in forms convenient for consumer consumption. Typical dosage formulations include oral capsule, oral suspension, oral tablet, chewable tablet, intravenous solution, topical gel, and combination kit. The recommendation with oral administration is usually to consume the drug with food or milk in both adults and children. IV administration is often an option in inpatient settings for convenience of delivery or when oral delivery is unavailable,[15][4] and infusion should be over at least 30 minutes for adults, and 10 minutes in pediatric patients. Ibuprofen with lysine is a commonly used IV formulation. Ibuprofen should not be administered simultaneously with total parenteral nutrition but may still use the same line, pausing total parenteral nutrition for 15 minutes before and after ibuprofen dosing. Burgeoning research is hoping to further explore the possibility of simultaneous delivery of ibuprofen with other IV medications or nutrition. A recent study exploring the chemical compatibility of continuous ibuprofen lysine infusion with total parenteral nutrition was conducted recently in 2018, which showed both physical and chemical compatibility of IV ibuprofen infusion with two different total parenteral nutrition formulations in neonates with PDA.[28] Topical application of ibuprofen is also currently under research as a more efficient means of treating diseases known to be susceptible to ibuprofen, such as osteoarthritis and dysmenorrhea.[9][29]

Adverse Effects

Gastrointestinal bleeding is a well-known adverse effect of ibuprofen usage and can lead to gastritis, ulceration, hemorrhage, or perforation. Inhibition of COX isoforms in ibuprofen usage leads to the reduction of prostaglandins, which play a role in the secretion of gastroprotective mucus.[30] This effect is more pronounced in non-selective NSAIDs, with COX-2 selective NSAIDs having a lower incidence of gastrointestinal complications, which is of particular concern in children, for which the use of ibuprofen is higher than other NSAIDs due to its comparative safety compared to other drugs in its class. Usage of ibuprofen over-the-counter without medical consultation also increases the risk of high dosage levels and short-term interval dosing that may precipitate gastrointestinal complications.[31]

Diminished renal function is also a concern with ibuprofen usage, with a recent surveillance study showing NSAIDs having nephrotoxic properties even in patients with no deficit in kidney function.[32] Dehydration is a common risk factor in ibuprofen-induced renal injury, and as such much research has been done on NSAIDs and kidney function in populations more vulnerable to dehydration, such as children with renal comorbidities or endurance athletes. A double-blind placebo-controlled trial in a population of ultramarathon participants showed an increased rate of acute kidney injury in those who took ibuprofen, with a number needed to harm of 5.5.[33] Consideration of a patient’s renal function is necessary when weighing treatment with ibuprofen or other NSAIDs.

Rashes are also a known adverse effect of ibuprofen usage, usually due to drug hypersensitivity or skin irritation via topical administration. A rash may also be part of a more severe syndrome caused by ibuprofen use, such as anaphylaxis or drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome. A case in 2016 reported a rare instance of DRESS syndrome, which causes skin, liver, and hematologic abnormalities, with ibuprofen use in a pediatric patient. DRESS syndrome is known to result more commonly with anticonvulsants, sulfa derivatives, and antimicrobials, and the number of known cases related to ibuprofen is limited. The etiology of DRESS syndrome is also unknown, with theories focusing on hypersensitivity to toxic metabolites or pathology involving human herpesvirus-6 currently postulated.[34] Other cases have existed in the literature of similar severe drug reactions involving ibuprofen or other NSAIDs; another case report in 2014 detailed a patient who developed drug-induced liver injury with multiform exudative erythema after ingestion of an over-the-counter medication containing ibuprofen for 20 days.[35]

The association between hypertension and NSAID use has undergone research previously. A cross-sectional study of an elderly population in 1993 showed NSAID usage to be an independent risk factor in the development of hypertension in this population.[36] Studies since then have pursued more knowledge on NSAIDs in the context of hypertension, such as investigating for comparative differences between NSAIDs. A retrospective cohort study in 2012 showed an association with a small increase in systolic blood pressure with NSAIDs compared to acetaminophen use, particularly ibuprofen. This effect was negligible, though, in patients prescribed diuretics or multiple antihypertensives.[37]

Intravenous ibuprofen in the treatment of patent ductus arteriosus (PDA) has shown an increased incidence of hyperbilirubinemia, as well as bilirubin-displacement due to the high protein binding of the medication.[38]

Contraindications

Ibuprofen use is contraindicated in patients with a known history of hypersensitivity or allergic reactions to the drug itself, other NSAIDs, or aspirin. Numerous case studies detail ibuprofen as a precipitant of disease after usage.[34][35] NSAIDs as a class are among the most frequently associated with hypersensitivity reactions for both adult and pediatric populations, with the most frequent diagnoses being urticaria/angioedema caused by cross-intolerance to other drug classes, namely quinolones and amoxicillin-clavulanic acid.[39] Research done on NSAID-induced hypersensitivity reactions in the pediatric population showed similar prevalence but differences in the clinical phenotypes. Oral provocation testing is still the gold standard for diagnosis of NSAID hypersensitivity, and safe alternatives for cross-intolerant children and adolescents exist, including tolmetin, etoricoxib, paracetamol, and nimesulide.[40]

In preterm neonates, ibuprofen lysine IV formulation is contraindicated in those with congenital heart diseases which require patency of the PDA, active bleeding, thrombocytopenia, renal impairment, coagulation defects, and proven or suspected necrotizing enterocolitis. Aside from this, ibuprofen use has been shown not to have any increased adverse effects when used in infants younger than six months and is still indicated for use in pediatric populations outside of these contraindications.[39]

In Canada, ibuprofen has contraindications listed on drug labels for additional conditions, including active GI or cerebrovascular bleeding, uncontrolled heart failure, lupus, renal impairment, and hepatic impairment or disease. 

Monitoring

For patients who use ibuprofen, appropriate monitoring should seek to minimize the possibility of common and uncommon adverse effects. Pain relief and gastrointestinal symptoms should be included in a patient’s clinical evaluation because they may suggest desensitization to the analgesic effect of ibuprofen or emerging gastritis or GI bleed. Blood pressure should also be monitored, especially in the elderly or hypertensive population.[36][37] Renal function monitoring is also a recommendation, as NSAIDs are known to be nephrotoxic in at-risk populations as well as individuals with normal baseline renal function.[32][33] Liver function is typically not monitored in patients who use ibuprofen, but cases of NSAID-induced livery injury in pediatric populations may suggest the need for monitoring in individuals with high-risk factors or at-risk populations. Though the much less frequent than acetaminophen, cases of NSAID-induced liver damage have occurred in past reports; unlike acetaminophen-induced liver injury, there is no antidote for liver damage due to NSAID use.[41] The increasing frequency of ibuprofen use in children points to a potential focus for further research on NSAID in the context of liver function.

Toxicity

Ibuprofen’s potential for toxicity in the body derives from the various cellular processes throughout multiple organ systems that are affected by the inhibition of the cyclooxygenase pathway. Prostaglandins and thromboxanes play important roles in maintaining the gastric mucosal layer and renal blood flow; though relatively small, ibuprofen still carries a risk of adverse gastrointestinal and renal events even at therapeutic levels. Overdose is a common reason for patient presentation with ibuprofen toxicity, with ibuprofen being the most common NSAID involved in an overdose at 29% with either exclusive use or use in combination with other analgesics.[42]

A risk score has been created by a study which sought to improve the risk-benefit ratio of NSAID usage; Their risk score was accurate in categorizing the one-year risk of major toxicity among NSAID users, with implications towards the utility in further aiding safe treatment of patients using NSAIDs.[43]

Reye syndrome is an increasingly rare phenomenon in modern times, in large part due to efforts by countries to curb aspirin usage beginning on the 1980s. The decreased usage of aspirin in children in the United Kingdom led to a decrease in the incidence of Reye syndrome, from 100 cases in 1984 to 3 cases in 2000.[41] NSAIDs are hepatotoxic and although rare, may precipitate Reye syndrome due to causing the same type of mitochondrial membrane damage.[44] Furthermore, much of the mechanism behind the effect of NSAIDs effect on liver function remains largely unknown. Due to the increasing use of ibuprofen in children, the focus should be on the possibility of a rise in the increasing frequency of drug-induced liver damage and Reye syndrome.[41]

Much like other widely used medications, there is increasing concern about the presence of ibuprofen in the environment as well as the long-term effects of environmental ibuprofen exposure. Studies currently show potential methods of bioremediation of ibuprofen in the atmosphere via bacterial strains,[45] mineral particles, and solar radiation.[46] The toxicity of ibuprofen’s degradation products has also been shown to be minimal compared to ibuprofen’s toxicity. Furthermore, studies have shown a low amount of toxicity towards tested organisms and no mutagenic activity of the drug. There is still a concern, however, for any possible indirect influence environmental ibuprofen may have on prostaglandin-regulated processes, such as ovulation, menstruation, inflammation, and pain.[45][46]

Enhancing Healthcare Team Outcomes

Ibuprofen benefits highly from interprofessional collaboration in its use on patients. There is an abundance of well-reviewed, large studies detailing ibuprofen’s indications for usage in various clinical scenarios. Successful usage of the medication in clinical practice will include knowledge of the latest clinical research, a thorough understanding of the patient, and realistic treatment goals based on current evidence for support. The patient’s primary physician, nursing staff, and pharmacist, all collaborating and ensuring the highest quality of care in a patient for which ibuprofen is part of the treatment regimen, will lead his team in a collaborative effort to ensure successful usage of the medication through these principles:   

  • Administer ibuprofen for the recommended FDA-approved and off-label indications while keeping in mind contraindications or risk factors that may lead to adverse effects.
  • Make a note of any stated over-the-counter ibuprofen use by a patient during a clinical encounter, being diligent in asking for frequency and dosage of usage.
  • Ask about ibuprofen use in patients with suspected gastritis or ulcerations, anemia, or thrombocytopenia.
  • Include ibuprofen in consideration of a toxic agent when treating patients who have overdosed on an unknown substance.
  • Use ibuprofen for mild to moderate pain control in patients with pain as a primary diagnosis or for symptom control ([2][4][8][9][11]– Level II).
  • NSAIDs, including ibuprofen, have shown potential as anticancer agents and should be considered in cancer treatment regimens where appropriate and supported by current research.
  • The use of aspirin and NSAIDs is recommended to prevent colorectal cancer as well as cardiovascular disease.
  • Appropriate monitoring of a patient’s pain level, emerging GI complaints, blood pressure, and renal function will reduce the risk of adverse effects of medication ([33][37] – Level II).
  • In pediatric patients, alternating acetaminophen and ibuprofen therapies can be more effective in the reduction of refractory fever than ibuprofen monotherapy alone ([6] – Level I).
  • Usage of ibuprofen to close PDA in neonates is equally as efficacious as indomethacin, with less renal toxicity and systemic vasoconstriction ([15] – Level II).
  • Intravenous Ibuprofen is physical and chemically compatible with certain formulations of total parenteral nutrition and can be given simultaneously in neonates with PDA ([28] – Level II).
  • Ibuprofen or aspirin should be given with colchicine for effective relief of acute pericarditis as well as reduction of recurrent pericarditis ([13] – Level III).

Being aware of these current evidence-based principles of ibuprofen use can help increase health outcomes for the patient in a collaborative, multidisciplinary healthcare environment. The typical patient who will need to be prescribed ibuprofen and monitored for use will benefit the most from the enhancement of collaborative efforts, as will patients who interact with the healthcare system in multiple settings on a regular basis. 


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