{"id":42928,"date":"2018-08-31T13:59:04","date_gmt":"2018-08-31T12:59:04","guid":{"rendered":"https:\/\/blogs.bmj.com\/bmj\/?p=42928"},"modified":"2018-09-07T16:18:14","modified_gmt":"2018-09-07T15:18:14","slug":"jeffrey-aronson-when-i-use-a-word-non-drugs","status":"publish","type":"post","link":"https:\/\/blogs.bmj.com\/bmj\/2018\/08\/31\/jeffrey-aronson-when-i-use-a-word-non-drugs\/","title":{"rendered":"Jeffrey Aronson: When I use a word . . . Non-drugs"},"content":{"rendered":"

\"jeffrey_aronson\"<\/a>As I discussed <\/span>last week<\/span><\/a>, definitions should preferably not include negations. Some terms that denote drug classes break this rule.<\/span><\/p>\n

Non-vitamin K antagonist oral anticoagulants (NOACs), for example, form a heterogeneous group of compounds (direct thrombin inhibitors, direct factor Xa inhibitors, and indirect factor Xa inhibitors) and should not be regarded as a class; calling them NOACs obscures this.<\/span><\/p>\n

Suxamethonium (succinylcholine) mimics acetylcholine by depolarizing the motor end-plate; however, unlike acetylcholine, it is not metabolized by acetylcholinesterase and it persists, preventing further depolarization and producing flaccid paralysis. Curare and its congeners, such as tubocurarine, vecuronuim, and rocuronium, the so-called non-depolarizing neuromuscular blocking agents, compete with acetylcholine, preventing its depolarizing action. Thus, both types of neuromuscular blockers actually prevent depolarization by acetylcholine.<\/span><\/p>\n

Non-steroidal anti-inflammatory drugs (NSAIDs), a heterogeneous group of compounds, include structurally different drugs with different actions on the major isoforms of the cyclo-oxygenases (COX1 and COX2). The term \u201ccoxibs\u201d, given to recent drugs, because they are relatively selective for COX2, gives the impression that none of the earlier NSAIDs is at all selective, <\/span>which is not the case<\/span><\/a>; nimesulide and meloxicam, for example, are in the same range of selectivity as celecoxib, and diclofenac is also relatively COX2 selective.<\/span><\/p>\n

Most drugs are not steroids, so it is not helpful to call this set of compounds \u201cnon-steroidal\u201d, especially when they have such divergent structures. Adding the term \u201canti-inflammatory\u201d doesn\u2019t help, since there are many compounds that are not steroids and have anti-inflammatory actions but are not classified as NSAIDs. Acetylsalicylic acid (aspirin) is a good example. It is not a steroid and is anti-inflammatory, but it is not generally regarded as an NSAID, and neither are other salicylates. Paracetamol is sometimes mistakenly called a non-steroidal anti-inflammatory drug, but while it is analgesic and antipyretic, it is not anti-inflammatory.<\/span><\/p>\n

Grapiprant<\/span><\/a>, used in veterinary medicine, has anti-inflammatory properties and is non-steroidal. However, its mechanism of action is as an antagonist at prostaglandin EP4 receptors.<\/span><\/p>\n

The WHO\u2019s Anatomical Therapeutic Chemical (ATC) classification struggles to cope with these difficulties. It <\/span>includes<\/span><\/a> the general labels \u201cAntiinflammatory and antirheumatic products” (section M01) and \u201cAntiinflammatory and antirheumatic products, nonsteroids\u201d (subsection M01A) (Table 1). However, the inclusion of the pseudo-mechanistic category labelled \u201ccoxibs\u201d is inconsistent, and a miscellaneous category lumps unrelated compounds together because they cannot be accommodated elsewhere. Corticosteroids for systemic use are in section H02. Acetylsalicylic acid is classified with other analgesics under N02, but also elsewhere for various reasons. The anilides, including paracetamol, are also in N02, as are the pyrazolone analgesics phenazone, metamizole, aminophenazone, propyphenazone, and nifenazone.<\/span><\/p>\n

Table 1.<\/b> The ATC classification of \u201cAntiinflammatory and antirheumatic products\u201d (section M01), with examples<\/span><\/p>\n

\"\"<\/p>\n

The first marketed compound now classified as an NSAID was phenylbutazone. It was originally used as a complexing agent to solubilize the analgesic aminophenazone (aminopyrine), allowing it to be given parenterally, in a formulation called <\/span>Irgapyrin<\/span><\/a> or Butapyrin, first marketed in 1949. The structural similarity of the two compounds can be seen in Figure 1. The combination was so effective that phenylbutazone was then studied on its own and found to have anti-inflammatory properties. It was marketed as <\/span>Butazolidin<\/span><\/a> in 1952. Other butazone derivatives followed:\u00a0<\/span>ketophenylbutazone<\/span><\/a> in 1958 and <\/span>oxyphenbutazone<\/span><\/a> in 1960.<\/span><\/p>\n

Figure 1.<\/b> Aminophenazone and phenylbutazone; given that aminophenazone can cause <\/span>agranulocytosis<\/span><\/a>, it is not surprising that <\/span>phenylbutazone<\/span><\/a> can do so too<\/span><\/p>\n

\"\"<\/p>\n

Since then a large range of drugs classified as NSAIDs have been synthesized. My current list runs to 108 in all (Figure 2), excluding those used solely in veterinary practice.<\/span><\/p>\n

Figure 2.<\/b> Numbers of NSAIDs discovered with time; blue dots = the numbers discovered in each 5 year period; orange dots = the cumulative numbers; nearly half were discovered in the 1970s; the earliest members of the groups are also shown<\/span><\/p>\n

\"\"<\/p>\n

Calling all of these compounds non-steroidal anti-inflammatory drugs obscures the many differences that distinguish them from each other. It would be better if we were to classify them primarily according to mechanism of action combined secondarily with structure. The ways in which they inhibit cyclo-oxygenase differ, and subcategories could be devised.<\/span><\/p>\n

Jeffrey Aronson<\/strong>\u00a0is a clinical pharmacologist, working in the Centre for Evidence Based Medicine in Oxford’s Nuffield Department of Primary Care Health Sciences. He is also president emeritus of the British Pharmacological Society.<\/em><\/p>\n

Competing interests:<\/strong>\u00a0None declared.<\/p>\n","protected":false},"excerpt":{"rendered":"

As I discussed last week, definitions should preferably not include negations. Some terms that denote drug classes break this rule. Non-vitamin K antagonist oral anticoagulants (NOACs), for example, form a […]<\/p>\n

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