|Systematic (IUPAC) name|
|Trade names||Advil, Brufen, Motrin, Nurofen, etc.|
|Licence data||US FDA:|
|Pregnancy cat.||C (AU) D (US)|
|Legal status||Unscheduled (AU) OTC (CA) GSL (UK) OTC (US)|
|Routes||Oral, rectal, topical, and intravenous|
|ATC code||C01 G02 M01 M02|
|Mol. mass||206.29 g/mol|
|Density||1,03 gr/ml g/cm³|
|Melt. point||76 °C (169 °F)|
| (what is this?)
Ibuprofen (INN) (pron.: // or // EYE-bew-PROH-fən; from iso-butyl-propanoic-phenolic acid) is a nonsteroidal anti-inflammatory drug (NSAID) used for pain relief, fever reduction, and against swelling.
Ibuprofen has an antiplatelet effect, though relatively mild and somewhat short-lived compared with aspirin or prescription antiplatelet drugs. In general, ibuprofen also acts as a vasoconstrictor. Ibuprofen is a 'core' medicine in the World Health Organization's Model List of Essential Medicines necessary to meet the minimum medical needs of a basic healthcare system.
Ibuprofen was derived from propanoic acid by the research arm of Boots Group during the 1960s and patented in 1961. Originally marketed as Brufen, ibuprofen is available under a variety of popular trademarks, including Motrin, Nurofen, Advil, and Nuprin. Generic formulations are available as well.
Medical uses 
Ibuprofen has a dose-dependent duration of action of around four to eight hours, which is longer than suggested by its short half-life. Onset of analgesa (time to effect) is 24.5 minutes using liquigel format orally. The recommended dose varies with body mass and indication. A dose of 400 mg per dose and 1200 mg per day is considered the maximum amount for over-the-counter use, although, under medical direction, the maximum amount for adults is 800 mg per dose or 3200 mg per day based on an individual's response and tolerance.
Unlike aspirin, which breaks down in solution, ibuprofen is stable, thus it can be available in topical gel form, which is absorbed through the skin, and can be used for sports injuries, with less risk of digestive problems.
Ibuprofen lysine 
In Europe, Australia, and New Zealand, ibuprofen lysine (the lysine salt of ibuprofen, sometimes called "ibuprofen lysinate" even though the lysine is in cationic form) is licensed for treatment of the same conditions as ibuprofen. The lysine salt increases water solubility, allowing intravenous use, and is indicated for closure of a patent ductus arteriosus in premature infants weighing between 500 and 1,500 grams (1 and 3 lb), who are no more than 32 weeks gestational age when usual medical management (e.g., fluid restriction, diuretics, respiratory support, etc.) is ineffective.
With regard to this indication, ibuprofen lysine is an effective alternative to intravenous indomethacin, and may be advantageous in terms of kidney function. Ibuprofen lysine has been shown to have a more rapid onset of action compared to acid ibuprofen.
In UK Ibuprofen Lysine is marketed as express pain relief, tension headache relief and more commonly migraine relief medicine. Usually available in packing of 16 342mg tablets the pack is marketed OTC by most superstores and pharmacies as their own branded product. Including but not limited to Asda, Tesco, Superdrug. 
Adverse effects 
Common adverse effects include: nausea, dyspepsia, gastrointestinal ulceration/bleeding, raised liver enzymes, diarrhea, constipation, epistaxis, headache, dizziness, priapism, rash, salt and fluid retention, and hypertension. A study from 2010 has shown regular use of NSAIDs was associated with an increase in hearing loss.
Ibuprofen appears to have the lowest incidence of digestive adverse drug reactions of all the nonselective NSAIDs. However, this holds true only at lower doses of ibuprofen, so over-the-counter (OTC) preparations of ibuprofen are, in general, labeled to advise a maximum daily dose of 1,200 mg.
Ibuprofen may be quantitated in blood, plasma, or serum to demonstrate the presence of the drug in a person having experienced an anaphylactic reaction, confirm a diagnosis of poisoning in hospitalized patients, or assist in a medicolegal death investigation. A nomogram relating ibuprofen plasma concentration, time since ingestion, and risk of developing renal toxicity in overdose patients has been published.
Cardiovascular risk 
Along with several other NSAIDs, chronic ibuprofen use has been found correlated with risk of hypertension and myocardial infarction (heart attack), particularly among those chronically using high doses. In older hypertensive patients treated with hydrochlorothiazide, ibuprofen in doses of 1800 mg per day was found to significantly increase systolic blood pressure.
Increased risk of kidney cancer 
A 2011 study in the Archives of Internal Medicine reported a 51% increase in the rate of renal cell carcinoma, the most common form of kidney cancer, in nurses who regularly took ibuprofen and other NSAIDs, such as naproxen.
Along with other NSAIDs, ibuprofen has been associated with the onset of bullous pemphigoid or pemphigoid-like blistering. As with other NSAIDs, ibuprofen has been reported to be a photosensitising agent, but it is considered a weak photosensitising agent compared to other members of the 2-arylpropionic acid class.
In October 2012, Calvin Lock, an 11-year-old boy from Littleport, Cambridgeshire, suffered from a rare, painful and almost fatal allergic reaction after taking a small dose of Nurofen for Children to fight a viral infection. The medicine caused his entire body to break out in blisters with his hair and fingernails falling out. Calvin lost 65 per cent of his skin. The condition, known as Stevens Johnson Syndrome (SJS), causes skin cells to die before being shed. 
Drinking alcohol when taking ibuprofen increases risk of stomach bleeding.
According to the US Food and Drug Administration, "ibuprofen can interfere with the antiplatelet effect of low-dose aspirin (81 mg per day), potentially rendering aspirin less effective when used for cardioprotection and stroke prevention." Allowing sufficient time between doses of ibuprofen and immediate-release (IR)aspirin can avoid this problem. The recommended elapsed time between a 400-mg dose of ibuprofen and a dose of aspirin depends on which is taken first. It would be 30 minutes or more for ibuprofen taken after IR aspirin, and 8 hours or more for ibuprofen taken before IR aspirin. However, this timing cannot be recommended for enteric-coated aspirin. But, if ibuprofen is taken only occasionally without the recommended timing, the reduction of the cardioprotection and stroke prevention of a daily aspirin regimen is minimal.
Erectile dysfunction risk 
A 2005 study linked long-term (over three months) use of NSAIDs, including ibuprofen, with a 140% higher risk of erectile dysfunction. The study, conducted at Kaiser Permanente and published in the Journal of Urology, reported, "regular nonsteroidal anti-inflammatory drug use is associated with erectile dysfunction beyond what would be expected due to age and other conditions". The director of research for Kaiser Permanente added, "There are many proven benefits of nonsteroidals in preventing heart disease and for other conditions. People shouldn't stop taking them based on this observational study. However, if a man is taking this class of drugs and has ED, it's worth a discussion with his doctor".
Ibuprofen overdose has become common since it was licensed for OTC use. Many overdose experiences are reported in the medical literature, although the frequency of life-threatening complications from ibuprofen overdose is low. Human response in cases of overdose ranges from absence of symptoms to fatal outcome despite intensive-care treatment. Most symptoms are an excess of the pharmacological action of ibuprofen, and include abdominal pain, nausea, vomiting, drowsiness, dizziness, headache, tinnitus, and nystagmus. Rarely, more severe symptoms, such as gastrointestinal bleeding, seizures, metabolic acidosis, hyperkalaemia, hypotension, bradycardia, tachycardia, atrial fibrillation, coma, hepatic dysfunction, acute renal failure, cyanosis, respiratory depression, and cardiac arrest have been reported. The severity of symptoms varies with the ingested dose and the time elapsed; however, individual sensitivity also plays an important role. Generally, the symptoms observed with an overdose of ibuprofen are similar to the symptoms caused by overdoses of other NSAIDs.
Correlation between severity of symptoms and measured ibuprofen plasma levels is weak. Toxic effects are unlikely at doses below 100 mg/kg, but can be severe above 400 mg/kg (around 150 tablets of 200 mg units for an average man); however, large doses do not indicate the clinical course is likely to be lethal. A precise lethal dose is difficult to determine, as it may vary with age, weight, and concomitant diseases of the individual patient.
Therapy is largely symptomatic. In cases presenting early, gastric decontamination is recommended. This is achieved using activated charcoal; charcoal adsorbs the drug before it can enter the systemic circulation. Gastric lavage is now rarely used, but can be considered if the amount ingested is potentially life-threatening, and it can be performed within 60 minutes of ingestion. Emesis is not recommended. The majority of ibuprofen ingestions produce only mild effects and the management of overdose is straightforward. Standard measures to maintain normal urine output should be instituted and renal function monitored. Since ibuprofen has acidic properties and is also excreted in the urine, forced alkaline diuresis is theoretically beneficial. However, because ibuprofen is highly protein-bound in the blood, renal excretion of unchanged drug is minimal. Forced alkaline diuresis is, therefore, of limited benefit. Symptomatic therapy for hypotension, gastrointestinal bleeding, acidosis, and renal toxicity may be indicated. On occasion, close monitoring in an intensive-care unit for several days is necessary. A patient who survives the acute intoxication usually experiences no late sequelae.
A Canadian study published in the Canadian Medical Association Journal of thousands of pregnant woman suggests those taking any type or amount of NSAIDs (including ibuprofen, diclofenac and naproxen) were 2.4 times more likely to miscarry than those not taking the drugs.
Mechanism of action 
Nonsteroidal anti-inflammatory drugs such as ibuprofen work by inhibiting the enzyme cyclooxygenase (COX), which converts arachidonic acid to prostaglandin H2 (PGH2). PGH2, in turn, is converted by other enzymes to several other prostaglandins (which are mediators of pain, inflammation, and fever) and to thromboxane A2 (which stimulates platelet aggregation, leading to the formation of blood clots).
Like aspirin and indomethacin, ibuprofen is a nonselective COX inhibitor, in that it inhibits two isoforms of cyclooxygenase, COX-1 and COX-2. The analgesic, antipyretic, and anti-inflammatory activity of NSAIDs appears to operate mainly through inhibition of COX-2, whereas inhibition of COX-1 would be responsible for unwanted effects on the gastrointestinal tract. However, the role of the individual COX isoforms in the analgesic, anti-inflammatory, and gastric damage effects of NSAIDs is uncertain and different compounds cause different degrees of analgesia and gastric damage.
To achieve the beneficial effects of ibuprofen and other NSAIDs without gastrointestinal ulceration and bleeding, selective COX-2 inhibitors were developed to inhibit the COX-2 isoform without inhibition of COX-1.
Ibuprofen is only very slightly soluble in water. Less than 1 mg of ibuprofen dissolves in 1 ml water (< 1 mg/ml).
Ibuprofen is produced industrially as a racemate. The compound, like other 2-arylpropionate derivatives (including ketoprofen, flurbiprofen, naproxen, etc.), does contain a chiral center in the α-position of the propionate moiety. So two enantiomers of ibuprofen occur, with the potential for different biological effects and metabolism for each enantiomer. Indeed, the (S)-(+)-ibuprofen (dexibuprofen) was found to be the active form both in vitro and in vivo.
It was logical, then, to consider the potential for improving the selectivity and potency of ibuprofen formulations by marketing ibuprofen as a single-enantiomer product (as occurs with naproxen, another NSAID). Further in vivo testing, however, revealed the existence of an isomerase (alpha-methylacyl-CoA racemase), which converted (R)-ibuprofen to the active (S)-enantiomer.
The synthesis of this compound is a popular case study in green chemistry. The original Boots synthesis of ibuprofen consisted of six steps, started with the Friedel-Crafts acetylation of isobutylbenzene. Reaction with ethyl chloroacetate (Darzens reaction) gave the α,β-epoxy ester, which was hydrolyzed and decarboxylated to the aldehyde. Reaction with hydroxylamine gave the oxime, which was converted to the nitrile, then hydrolyzed to the desired acid:
Ibuprofen was derived from propionic acid by the research arm of Boots Group during the 1960s. It was discovered by Andrew RM Dunlop, with colleagues Stewart Adams, John Nicholson, Vonleigh Simmons, Jeff Wilson and Colin Burrows, and patented in 1961. The drug was launched as a treatment for rheumatoid arthritis in the United Kingdom in 1969, and in the United States in 1974. Dr. Adams initially tested his drug on a hangover. He was subsequently awarded an OBE in 1987. Boots was awarded the Queen's Award for Technical Achievement for the development of the drug in 1987.
Ibuprofen was made available under prescription in the United Kingdom in 1969, and in the United States in 1974. In the years since, the good tolerability profile, along with extensive experience in the population, as well as in so-called phase IV trials (post-approval studies), has resulted in the availability of ibuprofen over the counter (OTC) in pharmacies worldwide, as well as in supermarkets and other general retailers.
North America 
Ibuprofen is commonly available in the United States up to the FDA's 200 mg 1984 dose limit OTC, higher by prescription.
In Canada, the OTC dose limit is 400 mg.
In 2009, the first injectable formulation of ibuprofen was approved in the United States, under the trade name Caldolor. Ibuprofen was the only parenteral for both pain and fever available in the country prior to the approval of Ofirmev (acetaminophen) injection by the FDA.
In some studies, ibuprofen showed superior results compared to a placebo in the prophylaxis of Alzheimer's disease, when given in low doses over a long time. Further studies are needed to confirm the results before ibuprofen can be recommended for this indication.
Ibuprofen has been associated with a lower risk of Parkinson's disease, and may delay or prevent it. Aspirin, other NSAIDs, and paracetamol (acetaminophen) had no effect on the risk for Parkinson's. In March 2011, researchers at Harvard Medical School announced in Neurology that ibuprofen had a neuroprotective effect against the risk of developing Parkinson's disease. People regularly consuming ibuprofen were reported to have a 38% lower risk of developing Parkinson's disease, but no such effect was found for other pain relievers, such as aspirin and paracetamol. Use of ibuprofen to lower the risk of Parkinson's disease in the general population would not be problem-free, given the possibility of adverse effects on the urinary and digestive systems. Further research is warranted before recommending ibuprofen for this use.
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