Category:Benzodiazepines: Difference between revisions

The benzodiazepines are a class of medicines used for anxiety, for insomnia, for seizures, and for muscle spasm, and at their peak, in the 1970s, they were the most widely prescribed medicines in the world. The first of them was found by accident. In the mid-1950s the chemist Leo Sternbach, working for Hoffmann-La Roche in Nutley, New Jersey, was looking for new tranquilizers and went back to a group of compounds he had studied decades earlier as a young researcher in Poland; Hoffmann-La Roche had helped Sternbach, a Polish-Jewish chemist, flee Europe in 1941. The compounds disappointed, and the work was shelved. Then, in 1957, during a laboratory cleanup, a colleague came upon a crystalline compound left from the abandoned project that had never been tested. It was sent for routine animal testing, largely so the chemistry could be published, and it showed strong sedative, muscle-relaxant, and anticonvulsant effects. It had rearranged, during synthesis, into a structure no one had intended, the first of a new class, and it was named chlordiazepoxide.^[1]

Chlordiazepoxide reached the market in 1960 as Librium, and diazepam followed in 1963 as Valium. For a time the two were among the most commercially successful medicines ever sold.^[1] Their rise was enormous: by the mid-1970s the benzodiazepines topped the lists of most-prescribed medicines, and diazepam in particular became a cultural fixture, the "mother's little helper" of a 1966 Rolling Stones song. Much of that success rested on safety. The benzodiazepines displaced the barbiturates and the older tranquilizers, and against the barbiturates in particular they were a genuine advance, far less likely to stop a person's breathing in overdose. But the benzodiazepines, the barbiturates, and alcohol all act on one broad system in the brain, and the belief that the new medicines had escaped the dependence that haunted the old ones would not hold.

The reckoning came slowly. Through the 1960s and 1970s benzodiazepines were prescribed freely, and often for years at a time. By the early 1980s controlled studies, notably by Malcolm Lader and Peter Tyrer, had established that people taking benzodiazepines at ordinary therapeutic doses could become physically dependent, with a real and sometimes prolonged withdrawal syndrome when they stopped.^[2] In the United Kingdom the benzodiazepines became the subject of what has been called the largest class-action lawsuit in the country's history, and the clinician Heather Ashton, who ran a benzodiazepine withdrawal clinic, wrote a withdrawal guide, the Ashton Manual, that is still widely used.^[3]

Benzodiazepines remain genuinely useful, with clear roles in the short-term treatment of severe anxiety, in some seizures, in alcohol withdrawal, and in anesthesia. But prescribing has shifted hard toward caution: short courses, the lowest effective dose, and a planned taper rather than an abrupt stop, which can itself be dangerous. In many countries they are no longer a first-line treatment for anxiety or insomnia. One modern hazard stands out. Because benzodiazepines and opioids both depress the central nervous system, taking them together sharply raises the risk of fatal respiratory depression, and a large share of opioid overdose deaths have also involved a benzodiazepine; in 2016 United States regulators added a boxed warning against co-prescribing the two classes, and in 2020 strengthened the benzodiazepine class warning to address dependence and withdrawal directly.^[4]

The benzodiazepines act at the GABA-A receptor, the receptor for the brain's principal inhibitory neurotransmitter, gamma-aminobutyric acid. They bind at a site separate from where GABA itself binds and act as positive modulators: they do not switch the receptor on by themselves, but deepen the effect of GABA when it is present, strengthening inhibition across the nervous system.^[1] That much is well established; the fuller relationship between this action and the development of tolerance and dependence is more complex and remains under study. This category collects the wiki's benzodiazepine pages, both the medicines in clinical use and the larger number of newer designer benzodiazepines that have appeared on the illicit market.

The wiki's benzodiazepine pages fall into two groups: the benzodiazepines in clinical use as medicines, and the designer benzodiazepines, structurally similar compounds that were never approved as medicines and have appeared instead on the illicit market as novel psychoactive substances.

• In clinical use: alprazolam, bromazepam, chlordiazepoxide, clobazam, clonazepam, clorazepate, diazepam, estazolam, etizolam, flunitrazepam, flurazepam, lorazepam, lormetazepam, midazolam, nitrazepam, oxazepam, quazepam, temazepam, and triazolam. They differ mainly in how fast they act and how long the effect lasts, the property that guides which is chosen for anxiety, for sleep, for seizures, or for anesthesia.
• Designer benzodiazepines: bromazolam, clonazolam, deschloroetizolam, diclazepam, flualprazolam, flubromazepam, flubromazolam, flunitrazolam, metizolam, nifoxipam, and pyrazolam, compounds sold on the unregulated market that carry the hazards of the clinical benzodiazepines without their oversight or their predictability of dose.

This category indexes the benzodiazepines: the medicines built on the benzodiazepine ring that act as positive modulators at the GABA-A receptor. It also indexes the designer benzodiazepines, which share that structure and that action but were never developed as medicines.

Several benzodiazepines have a second home in the wiki's index. Those used to control seizures, among them clonazepam, clobazam, and diazepam, also appear under Anticonvulsants; those used chiefly for sleep sit close to the Z-drugs, the non-benzodiazepine hypnotics that act at the same receptor. The benzodiazepine antagonist flumazenil, which blocks the receptor rather than modulating it, is related to the class but is not itself a benzodiazepine and is indexed separately. Following the wiki's multi-membership convention, a medicine is indexed wherever its pharmacology and its uses warrant.

Each benzodiazepine indexed here has its own page, built on the wiki's standard structure for a medicine: a history-first account, then pharmacology, indications, adverse effects, and interactions.

This is one of the wiki's MedCategory class-overview pages. It carries the MedCategory and MedCategoryFull marker tags; the second suppresses the member list that MediaWiki would otherwise generate automatically, leaving the curated index above as the only one the reader sees. The category sits beneath Medicines and beneath Pharmaceutical, the origin category for medicines that came into use through scientific discovery rather than traditional practice; the benzodiazepines, the first of them quite literally a laboratory accident, belong there without question.