Azapropazone Synthesis Essay

Non-steroidal anti-inflammatory drugs (NSAIDs) have been used for many years for analgesic, anti-inflammatory, and more recently in the case of aspirin, antithrombotic purposes. The use of NSAIDs continues to increase; over 22 million prescriptions are written every year in the UK, and over 70 million in the US. These figures underestimate their full use as aspirin and other NSAIDs are widely available as “over-the-counter” preparations.

The use of these drugs can also be expected to increase in the years to come, partly because of the increasing age of the population and partly because of possible new and developing indications, particularly in vascular disease and cancer prevention. It is therefore of importance to assess the safety and side effects of NSAIDs, and to consider how their safety may be improved. It has long been known that NSAIDs may have a range of side effects, of which the commonest are gastrointestinal.

It is the purpose of this paper to examine the nature, range, and causation of the gastrointestinal side effects associated with the use of NSAIDs, and to consider how these may be reduced or modified. NSAIDs may also be associated with other adverse effects, although these are much rarer than gastrointestinal problems; these include nephropathies, skin rashes, and hepatitis. NSAIDs may also interact with other drugs such as antihyperglycaemic or antihypertensive agents.

Gastrointestinal problems

NSAIDs may be associated with many gastrointestinal problems, ranging from mild to severe dyspeptic symptoms, the development of gastric or duodenal ulceration, haemorrhage or perforation, and other events which may lead to hospitalisation or death.

Endoscopic studies have shown a prevalence rate of 14%–25% of gastric and duodenal ulcers in NSAID users,1 although the difficulty of having accurate control groups makes exact figures difficult to obtain. Although endoscopic studies tend to show more gastric than duodenal ulcers associated with NSAID use, patients presenting with gastrointestinal bleeding on NSAIDs may have a similar frequency of gastric and duodenal ulceration. Dyspeptic symptoms occur in up to 60% of patients taking NSAIDs and there is a poor correlation between symptoms and endoscopically proved lesions; up to 50% of endoscopically confirmed ulcers associated with NSAIDs are asymptomatic.

It has been estimated that the individual risk of hospitalisation with gastrointestinal complications of NSAIDs is between 1/50 and 1/150 patient years.2 The risk of an upper gastrointestinal bleed is between 1/100 and 1/500 patient years; the risk of a gastrointestinal related death is between 1/1000 and 1/5000 patient years.

The risk of serious ulcer complications in patients on NSAIDs has been calculated in various studies, the relative risk (RR) for a serious gastrointestinal event overall being reported as 2.74 in a large meta-analysis, upper gastrointestinal bleeding RR 3.09, perforation RR 5.93, and ulcer related death RR 7.62.3

NSAIDs may have adverse effects in all parts of the gastrointestinal tract, not only the stomach or duodenum; the oesophagus, small intestine and colon may also be affected (box 1).

Box 1: Areas of the gastrointestinal tract that may be damaged by NSAIDs

  • Oesophagus: oesophagitis, ulceration, stricture

  • Stomach: ulcers, erosions

  • Duodenum: ulcers, erosions

  • Small intestine: ulcers, erosions, protein loss, strictures

  • Colon: non-specific colitis, exacerbation of ulcerative colitis and Crohn's disease

A recent necropsy study of 713 patients has been reported, of whom 244 had NSAIDs prescribed during the six months before death and 464 had not; death in all patients was unrelated to NSAID use. Ulcers of the stomach or duodenum were found in 21.7% of patients on NSAIDs and 12.3% of those not on NSAIDs (p<0.001), and small intestinal ulceration was found in 8.4% of NSAID users and 0.6% of patients not on NSAIDs (p<0.001).4 Damage to the small intestine in NSAID users has also been demonstrated at enteroscopy. Patients with small intestinal damage associated with chronic NSAID use may present with chronic iron deficiency anaemia or hypoalbuminaemia due to blood or protein loss, and may develop overt bleeding, perforation, or strictures.

In the oesophagus, chronic NSAID use may be associated, although rarely, with oesophagitis, ulceration, or stricture formation.5

In the large bowel, NSAID use may lead to the development of a non-specific colitis (with abdominal discomfort, bloody diarrhoea, and weight loss). NSAIDs may also cause an exacerbation of ulcerative colitis or Crohn's disease, if the associated arthropathy in inflammatory bowel disease is treated with NSAIDs.67

High risk factors for NSAID related gastrointestinal damage include older age group (especially over 70), previous history of peptic ulceration, and probably the first three months of NSAID treatment. Other high risk factors are smoking, underlying respiratory or cardiovascular disease, and concomitant drug use, particularly corticosteroids, aspirin, and anticoagulants (box 2).8Perioperative use is also a risk factor. Individual NSAIDs incurring highest risk include azapropazone, ketoprofen and piroxicam, and those with least risk include ibuprofen, diclofenac, and etodolac. Higher doses are associated with increased risk and also the use of more than one NSAID. There is also an increased risk of gastrointestinal complications with relatively low dose prophylactic aspirin, which is widely used nowadays.9 There is debate on the possible interaction and increased risk of Helicobacter pylori causing ulceration with NSAIDs, and this will be discussed in a later section. The balance of physiological association and clinical evidence tends to support the possibility of some interaction occurring, especially in those patients at high risk and possibly in those who have bled. Well planned, prospective controlled studies are required to provide more information on this with respect to different types and doses of NSAIDs, different forms and strains ofH pylori, and different types of erosions and ulcers.

Box 2: Risk factors for gastrointestinal damage due to NSAIDs

  • Age: older age group, especially over 70

  • Previous ulcer history

  • First three months of treatment

  • Smoking

  • Underlying cardiovascular or respiratory disease

  • Concomitant drug use, especially corticosteroids and anticoagulants

  • Use of NSAIDs in high doses, and more than one NSAID

  • ?Helicobacter pylori

Why do NSAIDs cause gastrointestinal damage?

NSAIDs interfere with the cyclo-oxygenase (COX) pathways which lead to the production of prostanoids (prostaglandins, prostacycline, and thromboxane). This interferes with mucosal protection by reducing the effectiveness of the mucus-bicarbonate barrier; gastric acid, and possibly also pepsin, are thus more likely to cause damage. The fact that most NSAIDs are also weak acids may also be a contributory factor.

It is now known that COX exists as two separate isoforms, COX-1 and COX-2, which differ markedly in their tissue expression and regulation.10-12 COX-1 is constitutively expressed in most tissues, including the stomach, duodenum, platelets, and kidneys; COX-1 plays a key part in the production of prostaglandins which regulate important physiological processes such as gastrointestinal cytoprotection (maintaining an effective mucus-bicarbonate barrier, submucosal blood flow, quicker and more effective mucosal adaptation to initial tissue damage, and more rapid recovery when such damage occurs). It is also involved in vascular homoeostasis and the maintenance of good renal function and in maintaining normal physiological functions in many other cells. This is an important “housekeeping” role. COX-2, on the other hand, is normally undetectable in most tissues, but it can be induced rapidly, and in large quantities—to 200–300-fold—by cytokines, growth factors, and hormones in the presence of inflammation and other pathological processes (box 3). Platelets appear to contain only COX-1.

Box 3: COX-1 and COX-2

  • Constitutively expressed in most tissues: stomach, duodenum, kidneys, platelets

  • Key role in the production of prostaglandins which regulate physiological processes: gastrointestinal protection, blood flow, adaptation, cellular recovery, maintenance of good renal function, vascular homoeostasis important “housekeeping” role

  • Normally undetectable in most tissues

  • Can be induced rapidly and in large quantities in the presence of inflammation and other pathological processes

Most conventional NSAIDs are non-selective in their COX inhibition, exerting their anti-inflammatory effects through the inhibition of COX-2, but having adverse effects (such as gastrointestinal mucosal damage and nephrotoxicity) primarily due to inhibition of COX-1. Some existing and longstanding NSAIDs, such as etodolac, a known safer NSAID with respect to gastrointestinal damage and which is known to have reduced adverse effects on mucosal prostaglandins, has been subsequently found to have a degree of COX-2 inhibition selectivity.

Currently, a range of new and specific COX-2 selective inhibitor NSAIDs have been, and are being further developed with the hope of reducing possible gastrointestinal side effects; the preliminary clinical results, as we shall see later, are encouraging. One of these, rofecoxib, is now available in this country.


Treatment and prevention of NSAID related gastrointestinal problems are shown in box 4.

Box 4: Treatment and prevention of NSAID related gastrointestinal problems

Healing of NSAID related ulcers
  • Reduce NSAID dose if possible, or use alternative NSAIDs

  • Use of acid suppressive drugs while continuing NSAIDs: high dose H2-receptor antagonists, or more effectively, proton pump inhibitors

Prevention of NSAID related gastrointestinal problems
  • Avoidance or reduction of risk factors if possible

  • Drugs which may improve mucosal protection: prostaglandin analogues (misoprostol)

  • Acid suppressive drugs: H2-receptor antagonists (high doses), proton pump inhibitors

  • COX-2 specific inhibitors

  • Eradication of Helicobacter pylori (in selected cases)


There is evidence from both animal and human studies that NSAIDs retard the healing of gastric ulcers. Although it is frequently stated that a first step if gastrointestinal problems occur with NSAIDs is to withdraw NSAIDs or reduce the dose, in practical terms this is generally unrealistic, especially when there is a major inflammatory condition such as rheumatoid arthritis.

It may be possible to reduce the dose of NSAIDs in some individuals. It is also appropriate to try alternative conventional NSAIDs as there is a wide variability in responses to individual drugs. Some NSAIDs are more likely than others to cause gastrointestinal problems; those associated with greatest risk include azapropazone, ketoprofen, and piroxicam.

H2-receptor antagonists, especially in high doses, do heal NSAID related ulcers while NSAIDs are continued,13 but proton pump inhibitors may be expected to be more effective, and have now been shown to be so. Omeprazole has been shown to heal gastric ulcers faster than ranitidine.14 In two large studies comparing omeprazole (20 mg or 40 mg daily) with misoprostol (200 μg four times a day), the proton pump inhibitors healed significantly more gastric and duodenal ulcers than ranitidine or misoprostol.

No extra benefit was gained from using omeprazole at the higher dose.1516


The lowest dose of the safest NSAID which is effective in individual patients should be used if possible.

Avoidance or reduction of risk factors may be possible in some patients, such as smoking, use in patients with a past history of dyspeptic problems or peptic ulcer, perioperative use, or cotherapy with other drugs such as corticosteroids, anticoagulants, or aspirin. Advice should be given about “over-the-counter” preparations.

There will inevitably be patients in whom additional requirements will be necessary, such as those who continue to require high dose NSAIDs or in those with risk factors which cannot be modified.

In such patients there has been much interest in recent years in attempting to reduce risk by the coprescription with NSAIDs of drugs which may improve mucosal protection (the prostaglandin analogue misoprostol) or reduce gastric acid (H2-receptor antagonists or proton pump inhibitors). More recently, newer NSAIDs—selective COX-2 inhibitors—offer the prospect of greater gastrointestinal safety.


The prostaglandin analogue misoprostol has shown a reduction in ulceration compared with placebo ranging from 50% to 90% over 3–12 months; the dose used initially was 200 μg four times a day and subsequently 400–600 μg per day. Protection has been generally similar for both gastric and duodenal ulcers.1718 A large blinded study of misoprostol compared with placebo (the “MUCOSA” study) reported a significant reduction of gastrointestinal bleeding and perforation with misoprostol at 800 μg daily.19 In this study, 27% of patients withdrew because of side effects, principally diarrhoea. Diarrhoea remains a problem for many patients with this preparation. Misoprostol has also been combined with a standard NSAID, diclofenac (arthrotec), and this has proved popular with a number of patients.

Theoretically, prostaglandin analogues have an advantage over acid suppressants in that they should provide mucosal protection throughout the gastrointestinal tract.


As gastric acid is a factor in causing gastroduodenal damage associated with NSAID use, reduction of gastric acid by the coprescription of acid suppressant drugs has been studied.

The use of H2-receptor antagonists in standard doses for the prevention of NSAID associated ulcers has shown some protection against duodenal ulcers.20 and the use of high dose famotidine (40 mg twice a day) has been shown to significantly reduce the cumulative incidence of both gastric and duodenal ulcers in patients with rheumatoid arthritis on long term NSAID therapy.21

Proton pump inhibitors cause more effective acid suppression than H2-receptor antagonists, and several randomised controlled trials lasting 3–6 months using omeprazole 20 mg daily have shown efficacy in preventing both gastric and duodenal ulcers while continuing long term NSAIDs, with about a 75%–80% reduction in ulcers compared with placebo.151622

The proton pump inhibitors were shown in two of these studies to provide more effective protection than ranitidine (150 mg twice a day) or misoprostol (200 μg twice a day).

Omeprazole 20 mg daily has also been shown to protect against bleeding from ulcers in long term NSAID users.23


The search for safer NSAIDs has recently focused on the development of preferential or selective COX-2 inhibitors. These compounds aim to exploit the belief that COX-1 is associated predominantly with the production of protective prostaglandins and has a “housekeeping” role, whereas COX-2 is induced in inflammation and associated with inflammatory processes. The development of these concepts has been recently reviewed.24

The definition of, and screening for, COX-2 selectivity has given rise to much debate, involving a variety of suggested systems that includes purified recombinant enzyme, transfected cells, and whole blood assays. The latter method may be the most appropriate at present, but all drugs suggested as COX-2 specific inhibitors require to be shown to have no significant inhibition of gastric mucosal prostaglandins, in addition to a good clinical safety profile and effectiveness.

Conventional longstanding NSAIDs have been found to vary with respect to their relative COX-1 to COX-2 inhibition capacity, but all have a significant effect on COX-1, thus interfering with gastric mucosal protection.

One NSAID, etodolac, which has been used widely for some years, has been shown in several studies to be clinically effective and have reduced gastrointestinal toxicity, demonstrated endoscopically and clinically; these studies also found no significant reduction of gastric mucosal prostaglandins compared with naproxen.2526 Etodolac has since been found to have some degree of COX-2 selectivity.27

Other drugs with probable relative COX-2 selectivity include nabumetone, nimesulide, and meloxicam.24

Newer more specific COX-2 inhibitors currently under study include celecoxib and rofecoxib (the latter now being available in this country). Preliminary results of studies with these drugs indicate effectiveness and a good gastrointestinal safety profile. Celecoxib (25–400 mg twice a day) was associated with a significantly reduced incidence of adverse upper gastrointestinal problems including ulcers, gastrointestinal bleeding, and perforation in patients with osteoarthritis and rheumatoid arthritis compared with standard NSAIDs.28 Rofecoxib (12.5–25 mg a day) demonstrated a lower incidence of endoscopic ulcers compared with ibuprofen in patients with osteoarthritis in a multicentre study over 24 weeks.29 Rofecoxib has also shown reduced occurrence of ulcers, perforations, and gastrointestinal bleeding.

COX-2 specific inhibitors have little, if any, effect on platelet function, and may therefore be associated with a marked reduction of gastrointestinal bleeding associated with NSAID use.

These studies are promising and more data are awaited. The long term safety of these drugs remains to be established, particularly with respect to the kidney and in the possible, although less likely, impairment of healing of pre-existing peptic ulcers. It is also theoretically possible that COX-2 inhibitors may have a benefit in preventing colon cancer and possibly also in Alzheimer's disease. COX-2 inhibitors will not be effective in cardiovascular protection unlike aspirin, as the protective effects provided by aspirin are mediated through COX-1.


Aspirin is widely used in low doses in patients with suspected or definite vascular disease. Aspirin is a major cause of upper gastrointestinal problems, and is a frequent cause of upper gastrointestinal bleeding. Even in low doses (75 mg daily), aspirin has effects on platelet levels of COX, which it acetylates and to which it binds irreversibly, thus impairing platelet function. This causes changes in the bleeding time, platelet aggregation, and the synthesis of thromboxane, which remain for the life of the platelet. The damage is worse with longer acting NSAIDs with long half lives and an extensive enterohepatic circulation, such as piroxicam.

With increasing use, aspirin is now a major cause of upper gastrointestinal problems, and in particular, upper gastrointestinal bleeding. One recent study reported an overall odds ratio of 3.2 (95% confidence interval (CI) 2.3 to 4.4) in gastrointestinal bleeding for daily aspirin use of at least one month, compared with 3.8 (95% CI 3.1 to 4.5) for non-aspirin NSAID use.9 This can be expected to increase with increasing use of low dose aspirin, especially common in older age groups.

Platelets contain only COX-1; thus only drugs such as aspirin and those NSAIDs which inhibit COX-1 will inhibit platelet function. COX-1 sparing NSAIDs such as etodolac, nabumetone, nimesulide, meloxicam, are likely to have little effect on platelet dysfunction. The highly specific COX-2 inhibitors (celecoxib, rofecoxib), have almost no effect on platelet function, and are likely, as mentioned previously, to lead to marked reductions in upper gastrointestinal bleeding. However, if used with low dose aspirin, there is likely to be a loss of benefit.

COX-2 specific inhibitors will not be helpful in vascular disease, and cannot be considered as a replacement in this respect for low dose aspirin.

A new antiplatelet agent, clopidrogel may be safer than aspirin, although more costly. Clopidrogel requires to be further assessed, but may be helpful in patients with peripheral artery disease, and in stroke or myocardial infarction in whom aspirin is contraindicated, or in whom aspirin fails to achieve the required therapeutic effect.


H pylori and NSAIDs are the two most common causes of peptic ulceration.

The possible interactions of H pylori and NSAIDs have led to much discussion recently and no clear picture emerges that can apply to all situations. In many ways, NSAIDs andH pylori have similar adverse effects on mucosal protective mechanisms, and despite H pylori itself producing small amounts of prostaglandins, there remains the possibility of an additive damaging effect when both are present.30 Studies on mucosal adaptation and on neutrophils raise the possibility of some inter-relationship that may allow damage to occur more readily when NSAIDs are taken in the presence of H pylori.31

The development of an ulcer when NSAIDs are given to patients who are H pylori positive may depend on the interaction of a number of factors, including previous exposure to NSAIDs, past history, gastric acid output, and the use of acid suppression drugs such as proton pump inhibitors.

Aspirin may have different interactions with H pylori, particularly with respect to the risk of gastrointestinal haemorrhage.

Gastrointestinal haemorrhage from ulcers may be in a different category from non-bleeding ulcers, and really requires to be studied separately; other factors may be involved, such as the possible antiplatelet effects of many NSAIDs, which may be a further factor in bleeding.

Clinical studies in this area have given conflicting results, although one study in patients not previously given NSAIDs clearly demonstrated an advantage in eradicating H pylori before starting NSAIDs; significantly fewer lesions developed over two months in patients in whom H pylori had been eradicated before starting NSAIDs.32 In such patients, especially if risk factors are present (older age group, previous ulcer history), eradication of H pylori before starting NSAIDs may be indicated.

A large multicentre study has found that eradication ofH pylori did not reduce the rate of ulcer relapse in existing long term NSAID users.33 In this study, it was also reported in a subgroup of 41 patients with gastric ulcers found at baseline endoscopy that eradication ofH pylori was associated with delayed ulcer healing. However, in another prospective, randomised study of 195 patients with H pylori infection and NSAID associated bleeding ulcers, eradication of H pylori did not impair healing of gastric or duodenal ulcers.34 A prospective, randomised clinical outcome study compared H pylorieradication alone with long term omeprazole for the prevention of recurrent ulcer haemorrhage in high risk users of aspirin or non-aspirin NSAIDs.35 The results to date indicate that eradication of H pylori alone did not prevent recurrent ulcer bleeding associated with non-aspirin NSAIDs, but H pylorieradication alone was as effective as maintenance omeprazole in preventing recurrent haemorrhage associated with low dose aspirin. Perhaps the antiplatelet effects of NSAIDs are relevant there.

H pylori testing would probably not be indicated in patients who have already been on NSAIDs or aspirin for some time without any adverse effects. In patients with a past history of peptic ulcer or dyspepsia on NSAIDs, long term acid suppressive agents such as proton pump inhibitors are indicated even after eradication of H pylori.

More scientific and clinical data are required on these complex inter-relationships.


  • The use of NSAIDs continues to increase, especially in the elderly.

  • NSAIDs may have adverse effects in any part of the gastrointestinal tract: oesophagus, stomach, duodenum, small intestine, or colon.

  • Risk factors for gastrointestinal damage due to NSAIDs include age, previous ulcer history, first three months of treatment, smoking, underlying cardiovascular or respiratory disease, concomitant drug use with corticosteroids and anticoagulants, high dose and multiple NSAIDs, and possibly in some cases H pylori.

  • Low dose prophylactic aspirin may also be associated with adverse gastrointestinal effects.

  • Healing of NSAID related ulcers can be achieved while NSAIDs are continued by the use of H2-receptor antagonists in high doses, or more effectively by proton pump inhibitors.

  • Prevention of NSAID related gastrointestinal problems may be achieved by identifying and if possible reducing risk factors, the coprescription of prostaglandin analogues or acid suppressive drugs (especially proton pump inhibitors), or by using the currently being developed and promising COX-2 specific inhibitors.

  • The development of COX-2 specific inhibitors offers the hope of real progress in producing much safer and effective NSAIDs.

Questions (answers on p 88)

Do patients with NSAID related ulcers always have dyspeptic symptoms?
In a patient on long term NSAIDs who has developed chronic iron deficiency anaemia, is the cause always likely to be found in the stomach or duodenum?
Is the use of low dose prophylactic aspirin safe with respect to the gastrointestinal tract?
Why don't we just reduce the dose of NSAIDs, or even stop NSAIDs, in patients at high risk or with gastrointestinal problems?
Is the cost of coprescription of acid suppressive drugs justified in patients on long term NSAIDs?
Is it likely that selective COX-2 inhibitors will reduce serious problems such as gastrointestinal haemorrhage?
Are patients on corticosteroids in addition to NSAIDs at greater risk of gastrointestinal problems?
Have prostaglandin analogues any advantage over acid suppressive agents in preventing NSAID problems in the gastrointestinal tract?
In considering risk factors for NSAID related gastrointestinal damage, is there any particular time of greatest danger?
Why should specific COX-2 inhibitors be safer?


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