Category:Anticonvulsants - Revision history

MDElliottMD: Category taxonomy ship: mark Category:Anticonvulsants renamed to Category:Antiepileptics

2026-05-22T00:37:41Z

Category taxonomy ship: mark Category:Anticonvulsants renamed to Category:Antiepileptics

← Older revision		Revision as of 00:37, 22 May 2026
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	The '''anticonvulsants''', also called the antiepileptic or antiseizure medicines, are the medicines used to prevent and control epileptic seizures, and their history, more than that of most classes, is a history of accident. For most of recorded time epilepsy had no effective treatment at all. That changed in 1857, when the English physician Charles Locock told a London medical society that potassium bromide appeared to reduce seizures in a group of his patients. Locock's reasoning was mistaken, he believed epilepsy arose from excessive sexual excitement and gave bromide because it was thought to blunt the sexual drive, but the observation itself held, and potassium bromide became the first genuinely useful antiseizure medicine.<ref name="brodie">Brodie MJ. Antiepileptic drug therapy the story so far. ''Seizure''. 2010 Dec;19(10):650–655. PMID: 21075011.</ref>		This category was renamed to '''[[:Category:Antiepileptics]]''' on 2026-05-21. This page is retained only as a navigation aid; do not tag medicines here.

	The next advance was stumbled upon in much the same way. In 1912 the German physician Alfred Hauptmann gave phenobarbital, then a new barbiturate, to his epileptic patients as a sedative to quiet them at night, partly so that he could sleep himself, and saw that those who took it had markedly fewer seizures.<ref name="brodie"/> Phenobarbital was more effective than bromide and much better tolerated, and it led the treatment of epilepsy for decades. It remains in use worldwide today, a century after that chance observation, particularly where cost is decisive.

	The modern era began in the 1930s with a change of method. Rather than wait for a lucky observation, the American neurologists Houston Merritt and Tracy Putnam built an animal model, an electrically induced seizure in the cat, against which candidate compounds could be tested in series. Screening compounds chemically related to phenobarbital, they found one that suppressed seizures with far less sedation, and in 1938 introduced it as phenytoin.<ref name="rho">Rho JM, White HS. Brief history of anti-seizure drug development. ''Epilepsia Open''. 2018 Dec;3(Suppl 2):114–119. PMID: 30564769.</ref> The achievement was twofold: phenytoin itself, which would treat epilepsy for decades, and the proof that antiseizure medicines could be found by deliberate screening rather than by luck, a method that went on to shape the discovery of medicines well beyond epilepsy.

	A first generation followed over the next decades, among them primidone, ethosuximide, carbamazepine, and valproic acid, the last of these, like several before it, found to possess antiseizure activity by chance. From the late twentieth century a second generation arrived, including lamotrigine, levetiracetam, gabapentin, topiramate, and oxcarbazepine. The newer medicines are not, in general, better at controlling seizures than the older ones, but many are better tolerated and interact less with other medicines.<ref name="hakami">Hakami T. Neuropharmacology of antiseizure drugs. ''Neuropsychopharmacology Reports''. 2021 Sep;41(3):336–351. PMID: 34296824.</ref> The class shares no single mechanism: it is defined by what its members do, suppress seizures, rather than by how they do it. A seizure is, in broad terms, a burst of excessive and synchronized electrical activity in the brain, and the antiseizure medicines are understood to damp that activity by several different routes, blocking voltage-gated sodium channels, strengthening the inhibitory neurotransmitter GABA, acting on calcium channels, or quieting the release of neurotransmitters.<ref name="hakami"/>

	Anticonvulsants reach well beyond epilepsy: several are mainstays of psychiatry as mood stabilizers, and others treat neuropathic pain and migraine. One caution has come to define the class in modern practice. Several anticonvulsants taken during pregnancy raise the risk of birth defects and of later harm to a child's development; the risk is greatest, and clearly dose-dependent, for valproic acid, and for that reason the use of valproate in people who might become pregnant is now sharply restricted.<ref name="pack2024">Pack AM, Oskoui M, Williams Roberson S, et al. Teratogenesis, perinatal, and neurodevelopmental outcomes after in utero exposure to antiseizure medication: practice guideline from the AAN, AES, and SMFM. ''Neurology''. 2024 Jun;102(11):e209279. PMID: 38748979.</ref> This category ~~collects the wiki's anticonvulsant pages and groups them, as the field does, by generation.~~

	~~== Anticonvulsants indexed ==~~

	~~The anticonvulsants are conventionally grouped by generation, the order in which they reached use, since the class shares no single mechanism.~~

	* '''First generation''': the agents of the bromide-to~~-mid-century era. [[phenobarbital]], [[phenytoin]] and its prodrug [[fosphenytoin]], [[primidone]], [[ethosuximide]], [[carbamazepine]], and [[valproic acid]].~~
	* '''Second generation''': the agents developed from the 1980s onward, generally better tolerated and with fewer interactions. [[lamotrigine]], [[levetiracetam]], [[gabapentin]], [[pregabalin]], [[topiramate]], [[oxcarbazepine]], [[lacosamide]], [[zonisamide]], [[vigabatrin]], [[tiagabine]], [[felbamate]], [[eslicarbazepine]], and [[rufinamide]].
	* '''Newer agents'''~~: [[brivaracetam]], [[cenobamate]], [[perampanel]], and [[stiripentol]].~~
	* '''Benzodiazepines used in epilepsy''': [[clobazam]], [[clonazepam]], and [[diazepam]], indexed here for their antiseizure use; they belong primarily to [[:Category:~~Benzodiazepines\|Benzodiazepines~~]].
	* '''~~Syndrome~~-~~specific agents''': [[cannabidiol]] and [[fenfluramine]], brought into use for severe childhood epilepsies such as the Dravet and Lennox~~-~~Gastaut syndromes~~.

	~~== Notes on scope ==~~

	This ~~category indexes the medicines whose defining action~~ is ~~the suppression of epileptic seizures, grouped above by generation. The boundary is that antiseizure activity, not any single mechanism or chemical family.~~

	~~Many anticonvulsants are used well beyond epilepsy, and are cross-indexed accordingly. Valproic acid, carbamazepine, and lamotrigine are central to psychiatry~~ as mood stabilizers and also appear under [[:Category:Mood Stabilizers\|Mood Stabilizers]]; gabapentin, pregabalin, and topiramate are widely used for neuropathic pain and for migraine. The benzodiazepines used in epilepsy are indexed here for that use while belonging primarily to [[:Category:Benzodiazepines\|Benzodiazepines]]. Following the wiki's multi-membership convention, a medicine is indexed wherever its pharmacology and its uses warrant.

	~~== About these pages ==~~

	~~Each anticonvulsant 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. Alongside the generation grouping above, the wiki maintains a set of mechanism-based subcategories, among them sodium channel blockers, GABA enhancers, SV2A ligands, carbonic anhydrase inhibitors, and glutamate/AMPA antagonists, which cut across the generations.

	~~This is one of the wiki's MedCategory class-overview pages. It carries the [[:Category:MedCategory\|MedCategory]] and [[:Category:MedCategoryFull\|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 category sits beneath [[:Category:Medicines\|Medicines]] and beneath [[:Category:Pharmaceutical\|Pharmaceutical]], the origin category for medicines that came into use through scientific discovery rather than traditional practice; even the chance discoveries that mark this class were observations made on synthesized compounds in the clinic and the laboratory.

	~~== References ==~~

	~~<references/>~~

	~~[[Category:MedCategory]]~~
	~~[[Category:MedCategoryFull]]~~
	~~[[Category:Medicines]]~~
	~~[[Category:Pharmaceutical]]~~

MDElliottMD: Retrofit to canonical category structure: history-first lead (Locock, Hauptmann, Merritt and Putnam), members indexed by generation, Notes on scope and About these pages; added missing Medicines tag; all citations PMID-verified

2026-05-21T07:15:09Z

Retrofit to canonical category structure: history-first lead (Locock, Hauptmann, Merritt and Putnam), members indexed by generation, Notes on scope and About these pages; added missing Medicines tag; all citations PMID-verified

Show changes

MDElliottMD: Phase 2 retag: add Pharmaceutical root parent (taxonomy restructure 2026-05-20)

2026-05-19T19:22:04Z

Phase 2 retag: add Pharmaceutical root parent (taxonomy restructure 2026-05-20)

← Older revision		Revision as of 19:22, 19 May 2026
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	[[Category:MedCategory]]		[[Category:MedCategory]]
	[[Category:MedCategoryFull]]		[[Category:MedCategoryFull]]
			[[Category:Pharmaceutical]]

MDElliottMD: Em-dash sweep: replace em-dash with comma per project rule; PendellsCorner verbatim quotes preserved.

2026-05-19T03:16:13Z

Em-dash sweep: replace em-dash with comma per project rule; PendellsCorner verbatim quotes preserved.

← Older revision		Revision as of 03:16, 19 May 2026
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	The anticonvulsants — also called antiepileptic or antiseizure medicines — are the class of medicines used to prevent and control epileptic seizures. Their history is, more than most, a history of accident: several of the most important were found to work against seizures by chance, and the systematic search for them was one of the earliest examples of modern drug screening.		The anticonvulsants, also called antiepileptic or antiseizure medicines, are the class of medicines used to prevent and control epileptic seizures. Their history is, more than most, a history of accident: several of the most important were found to work against seizures by chance, and the systematic search for them was one of the earliest examples of modern drug screening.

	== Bromide and the first treatment ==		== Bromide and the first treatment ==
	For most of recorded history epilepsy had no effective medical treatment. That changed in 1857, when the English physician Charles Locock reported to a London medical society that potassium bromide appeared to reduce seizures in a group of his patients. Locock's reasoning was mistaken — he believed epilepsy was linked to excessive sexual excitement, and used bromide because it was thought to dampen sexual drive — but the observation itself held up, and potassium bromide became the first genuinely useful antiseizure medicine.<ref name="brodie">Brodie MJ. Antiepileptic drug therapy the story so far. ''Seizure.'' 2010;19(10):650–655. PMID 21075011.</ref> Bromide had serious drawbacks — sedation, skin eruptions, and effects on mood and behaviour — but for half a century it was essentially all there was.		For most of recorded history epilepsy had no effective medical treatment. That changed in 1857, when the English physician Charles Locock reported to a London medical society that potassium bromide appeared to reduce seizures in a group of his patients. Locock's reasoning was mistaken, he believed epilepsy was linked to excessive sexual excitement, and used bromide because it was thought to dampen sexual drive, but the observation itself held up, and potassium bromide became the first genuinely useful antiseizure medicine.<ref name="brodie">Brodie MJ. Antiepileptic drug therapy the story so far. ''Seizure.'' 2010;19(10):650–655. PMID 21075011.</ref> Bromide had serious drawbacks, sedation, skin eruptions, and effects on mood and behaviour, but for half a century it was essentially all there was.

	== Phenobarbital, found by accident ==		== Phenobarbital, found by accident ==
	The next advance, in 1912, was also accidental. The German physician Alfred Hauptmann was using [[phenobarbital]] — then a new barbiturate — as a sedative to quiet his epileptic patients at night, partly so that he himself could sleep; he noticed that the patients given it had markedly fewer seizures.<ref name="brodie"/> [[Phenobarbital]] proved far more effective than bromide and much better tolerated, and it became the leading antiseizure medicine for decades. It remains in use worldwide today, particularly where cost matters, a century after that chance observation.		The next advance, in 1912, was also accidental. The German physician Alfred Hauptmann was using [[phenobarbital]], then a new barbiturate, as a sedative to quiet his epileptic patients at night, partly so that he himself could sleep; he noticed that the patients given it had markedly fewer seizures.<ref name="brodie"/> [[Phenobarbital]] proved far more effective than bromide and much better tolerated, and it became the leading antiseizure medicine for decades. It remains in use worldwide today, particularly where cost matters, a century after that chance observation.

	== Merritt, Putnam, and the birth of drug screening ==		== Merritt, Putnam, and the birth of drug screening ==
	The modern era of antiseizure medicine began in the 1930s with a change in method. Rather than waiting for a chance observation, the American neurologists Houston Merritt and Tracy Putnam developed an animal model — an electrically induced seizure in cats — against which candidate compounds could be systematically tested. Screening a series of compounds chemically related to [[phenobarbital]], they identified one that suppressed seizures with far less sedation, and in 1938 introduced it as [[phenytoin]].<ref name="rho">Rho JM, White HS. Brief history of anti-seizure drug development. ''Epilepsia Open.'' 2018;3(Suppl 2):114–119. PMID 30564769.</ref> The achievement was twofold: [[phenytoin]] itself, which would treat epilepsy for decades, and the demonstration that antiseizure medicines could be found by deliberate screening rather than luck — the model on which later drug discovery was built.		The modern era of antiseizure medicine began in the 1930s with a change in method. Rather than waiting for a chance observation, the American neurologists Houston Merritt and Tracy Putnam developed an animal model, an electrically induced seizure in cats, against which candidate compounds could be systematically tested. Screening a series of compounds chemically related to [[phenobarbital]], they identified one that suppressed seizures with far less sedation, and in 1938 introduced it as [[phenytoin]].<ref name="rho">Rho JM, White HS. Brief history of anti-seizure drug development. ''Epilepsia Open.'' 2018;3(Suppl 2):114–119. PMID 30564769.</ref> The achievement was twofold: [[phenytoin]] itself, which would treat epilepsy for decades, and the demonstration that antiseizure medicines could be found by deliberate screening rather than luck, the model on which later drug discovery was built.

	A first generation of antiseizure medicines followed over the next decades, among them [[primidone]], [[ethosuximide]], [[carbamazepine]], and [[valproic acid]] — the last, like several before it, found to have antiseizure activity by chance.<ref name="brodie"/> The [[:Category:Benzodiazepines\|benzodiazepines]], developed as sedatives and anti-anxiety medicines, were also soon recognized to have antiseizure activity, and some came into use for epilepsy.		A first generation of antiseizure medicines followed over the next decades, among them [[primidone]], [[ethosuximide]], [[carbamazepine]], and [[valproic acid]], the last, like several before it, found to have antiseizure activity by chance.<ref name="brodie"/> The [[:Category:Benzodiazepines\|benzodiazepines]], developed as sedatives and anti-anxiety medicines, were also soon recognized to have antiseizure activity, and some came into use for epilepsy.

	== The modern generation ==		== The modern generation ==
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	== Mechanisms ==		== Mechanisms ==
	The anticonvulsants do not share a single mechanism — the class is defined by what its members do (suppress seizures) rather than by how. A seizure is, in broad terms, a burst of excessive and synchronized electrical activity in the brain, and antiseizure medicines are understood to act by damping that activity through several different routes. Some, such as [[phenytoin]] and [[carbamazepine]], are understood to act mainly by blocking voltage-gated sodium channels, reducing the rapid repetitive firing of neurons. Others enhance the inhibitory neurotransmitter GABA — the route by which [[phenobarbital]] and the [[:Category:Benzodiazepines\|benzodiazepines]] are understood to act. Still others act on calcium channels or on the release of neurotransmitters. For several agents more than one mechanism is involved, and for some the full picture is not established. That these medicines have these actions is reasonably well established; the fuller relationship between a given action and the control of seizures in a particular person remains a subject of research.		The anticonvulsants do not share a single mechanism, the class is defined by what its members do (suppress seizures) rather than by how. A seizure is, in broad terms, a burst of excessive and synchronized electrical activity in the brain, and antiseizure medicines are understood to act by damping that activity through several different routes. Some, such as [[phenytoin]] and [[carbamazepine]], are understood to act mainly by blocking voltage-gated sodium channels, reducing the rapid repetitive firing of neurons. Others enhance the inhibitory neurotransmitter GABA, the route by which [[phenobarbital]] and the [[:Category:Benzodiazepines\|benzodiazepines]] are understood to act. Still others act on calcium channels or on the release of neurotransmitters. For several agents more than one mechanism is involved, and for some the full picture is not established. That these medicines have these actions is reasonably well established; the fuller relationship between a given action and the control of seizures in a particular person remains a subject of research.

	== Members ==		== Members ==
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	== Safety ==		== Safety ==
	Most anticonvulsants cause dose-related effects on the central nervous system — drowsiness, dizziness, unsteadiness — particularly when treatment begins or the dose is raised. Beyond these, individual medicines carry their own characteristic risks: some are associated with serious skin reactions, some with effects on the liver or blood, and abrupt withdrawal of an antiseizure medicine can itself provoke seizures, so treatment is not stopped suddenly.		Most anticonvulsants cause dose-related effects on the central nervous system, drowsiness, dizziness, unsteadiness, particularly when treatment begins or the dose is raised. Beyond these, individual medicines carry their own characteristic risks: some are associated with serious skin reactions, some with effects on the liver or blood, and abrupt withdrawal of an antiseizure medicine can itself provoke seizures, so treatment is not stopped suddenly.

	A particularly important consideration is use in pregnancy. Several anticonvulsants, taken during pregnancy, are associated with an increased risk of birth defects and of effects on a child's later development. This risk is not uniform across the class: it is greatest for [[valproic acid]], for which the risk is substantial and dose-dependent, and considerably lower for some other agents such as [[lamotrigine]] and [[levetiracetam]]. Because of this, the use of [[valproic acid]] in people who may become pregnant has become increasingly restricted. As with all medicines, figures for these risks are population estimates that vary between studies, decisions involve balancing the risks of medication against the serious risks of uncontrolled seizures, and individual response varies considerably between people.		A particularly important consideration is use in pregnancy. Several anticonvulsants, taken during pregnancy, are associated with an increased risk of birth defects and of effects on a child's later development. This risk is not uniform across the class: it is greatest for [[valproic acid]], for which the risk is substantial and dose-dependent, and considerably lower for some other agents such as [[lamotrigine]] and [[levetiracetam]]. Because of this, the use of [[valproic acid]] in people who may become pregnant has become increasingly restricted. As with all medicines, figures for these risks are population estimates that vary between studies, decisions involve balancing the risks of medication against the serious risks of uncontrolled seizures, and individual response varies considerably between people.

MDElliottMD: Create Anticonvulsants category page

2026-05-18T01:26:28Z

Create Anticonvulsants category page

New page

The anticonvulsants — also called antiepileptic or antiseizure medicines — are the class of medicines used to prevent and control epileptic seizures. Their history is, more than most, a history of accident: several of the most important were found to work against seizures by chance, and the systematic search for them was one of the earliest examples of modern drug screening.

== Bromide and the first treatment ==
For most of recorded history epilepsy had no effective medical treatment. That changed in 1857, when the English physician Charles Locock reported to a London medical society that potassium bromide appeared to reduce seizures in a group of his patients. Locock's reasoning was mistaken — he believed epilepsy was linked to excessive sexual excitement, and used bromide because it was thought to dampen sexual drive — but the observation itself held up, and potassium bromide became the first genuinely useful antiseizure medicine.<ref name="brodie">Brodie MJ. Antiepileptic drug therapy the story so far. ''Seizure.'' 2010;19(10):650–655. PMID 21075011.</ref> Bromide had serious drawbacks — sedation, skin eruptions, and effects on mood and behaviour — but for half a century it was essentially all there was.

== Phenobarbital, found by accident ==
The next advance, in 1912, was also accidental. The German physician Alfred Hauptmann was using [[phenobarbital]] — then a new barbiturate — as a sedative to quiet his epileptic patients at night, partly so that he himself could sleep; he noticed that the patients given it had markedly fewer seizures.<ref name="brodie"/> [[Phenobarbital]] proved far more effective than bromide and much better tolerated, and it became the leading antiseizure medicine for decades. It remains in use worldwide today, particularly where cost matters, a century after that chance observation.

== Merritt, Putnam, and the birth of drug screening ==
The modern era of antiseizure medicine began in the 1930s with a change in method. Rather than waiting for a chance observation, the American neurologists Houston Merritt and Tracy Putnam developed an animal model — an electrically induced seizure in cats — against which candidate compounds could be systematically tested. Screening a series of compounds chemically related to [[phenobarbital]], they identified one that suppressed seizures with far less sedation, and in 1938 introduced it as [[phenytoin]].<ref name="rho">Rho JM, White HS. Brief history of anti-seizure drug development. ''Epilepsia Open.'' 2018;3(Suppl 2):114–119. PMID 30564769.</ref> The achievement was twofold: [[phenytoin]] itself, which would treat epilepsy for decades, and the demonstration that antiseizure medicines could be found by deliberate screening rather than luck — the model on which later drug discovery was built.

A first generation of antiseizure medicines followed over the next decades, among them [[primidone]], [[ethosuximide]], [[carbamazepine]], and [[valproic acid]] — the last, like several before it, found to have antiseizure activity by chance.<ref name="brodie"/> The [[:Category:Benzodiazepines|benzodiazepines]], developed as sedatives and anti-anxiety medicines, were also soon recognized to have antiseizure activity, and some came into use for epilepsy.

== The modern generation ==
From the late twentieth century a second generation of antiseizure medicines was developed, including [[lamotrigine]], [[levetiracetam]], [[gabapentin]], [[topiramate]], [[oxcarbazepine]], and others. These newer medicines are not, in general, more effective at controlling seizures than the older ones, but many are better tolerated and have fewer interactions with other medicines.<ref name="hakami">Hakami T. Neuropharmacology of antiseizure drugs. ''Neuropsychopharmacol Rep.'' 2021;41(3):336–351. PMID 34296824.</ref> The choice of medicine depends heavily on the type of seizure and on the individual patient; for a substantial minority of people with epilepsy, seizures remain difficult to control despite treatment.

== Mechanisms ==
The anticonvulsants do not share a single mechanism — the class is defined by what its members do (suppress seizures) rather than by how. A seizure is, in broad terms, a burst of excessive and synchronized electrical activity in the brain, and antiseizure medicines are understood to act by damping that activity through several different routes. Some, such as [[phenytoin]] and [[carbamazepine]], are understood to act mainly by blocking voltage-gated sodium channels, reducing the rapid repetitive firing of neurons. Others enhance the inhibitory neurotransmitter GABA — the route by which [[phenobarbital]] and the [[:Category:Benzodiazepines|benzodiazepines]] are understood to act. Still others act on calcium channels or on the release of neurotransmitters. For several agents more than one mechanism is involved, and for some the full picture is not established. That these medicines have these actions is reasonably well established; the fuller relationship between a given action and the control of seizures in a particular person remains a subject of research.

== Members ==
The first-generation anticonvulsants include [[phenobarbital]], [[phenytoin]], [[primidone]], [[ethosuximide]], [[carbamazepine]], and [[valproic acid]]. The second-generation agents include [[lamotrigine]], [[levetiracetam]], [[gabapentin]], [[pregabalin]], [[topiramate]], [[oxcarbazepine]], [[lacosamide]], [[zonisamide]], and [[vigabatrin]], among others. Several [[:Category:Benzodiazepines|benzodiazepines]] are also used for their antiseizure activity. The list is not exhaustive.

== Safety ==
Most anticonvulsants cause dose-related effects on the central nervous system — drowsiness, dizziness, unsteadiness — particularly when treatment begins or the dose is raised. Beyond these, individual medicines carry their own characteristic risks: some are associated with serious skin reactions, some with effects on the liver or blood, and abrupt withdrawal of an antiseizure medicine can itself provoke seizures, so treatment is not stopped suddenly.

A particularly important consideration is use in pregnancy. Several anticonvulsants, taken during pregnancy, are associated with an increased risk of birth defects and of effects on a child's later development. This risk is not uniform across the class: it is greatest for [[valproic acid]], for which the risk is substantial and dose-dependent, and considerably lower for some other agents such as [[lamotrigine]] and [[levetiracetam]]. Because of this, the use of [[valproic acid]] in people who may become pregnant has become increasingly restricted. As with all medicines, figures for these risks are population estimates that vary between studies, decisions involve balancing the risks of medication against the serious risks of uncontrolled seizures, and individual response varies considerably between people.

== References ==

<references/>

[[Category:MedCategory]]
[[Category:MedCategoryFull]]