hypnotics drugs used in treating motor disordersantiepilepsy.pdf · • the commonest drugs used in...
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HYPNOTICS
DRUGS USED IN TREATING
MOTOR DISORDERS
J. Mojžiš
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Hypno-sedative drugs
terminology
Sedation
can be defined as a supression of responsiveness to a
constant level of stimulation, with decreased
spontaneous activity
Hypnotic effects
involve more pronounced depression of the CNS than
sedation, and this can be achieved with most sedative
drugs simply increasing the dose.
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Hypno-sedatives
I. generation – barbiturates (obsolete)
II. generation – benzodiazepines (BZD)
III. generation – zolpidem, zaleplon
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Benzodiazepines
• act selectively on gamma-aminobutyric acid (GABAA)
receptors, which mediate fast inhibitory synaptic
transmission through the CNS
• they bind specifically to a regulatory site of the
receptor, distinct from the GABA binding site and act
allosterically to increase the affinity of GABA for the
receptors
• by facilitating the opening of GABA activated chloride-
channels BZ enhance the response to GABA
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Benzodiazepines –
Mechanism of Action
GABA-A receptors – highly
variable (i.e., consist of different
complements of alpha, beta, and
gamma subunits).
= different sensitivities to
benzodiazepines.
= a2 subunit is critical in
sedative effects.
Benzodiazepines do NOT activate
the receptor directly.
= increase frequency of
chloride-channel opening
produced by GABA.
GABA Receptor
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Benzodiazepines
absorption: well absorbed if given orally , Cmax reached in
about 1 h
binding: strongly bound to plasma proteins
distribution: large Vd: accumulation in body fat (high lipid
sol.)
metabolism: hydroxylation, conjugation with glucuronic
acid
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Benzodiazepines
Pharmacological effects and uses
The main effects
• reduction of anxiety and agression
• sedation and induction of sleep
• reduction of muscle tone and coordination
• anticonvulsant effects
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Benzodiazepines
Indications
• reduction of anxiety and agression
Note: BZD may paradoxically produce an increase
in irritability and aggression in some individuals
(particularly if short- acting drugs are given (triazolam)
• sedation and induction of sleep
BZDs decrease the time taken to get to sleep
increase the total duration of sleep (only in subjects who
normally sleep for less than about 6 hours each night)
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Benzodiazepines
Non-rapid eye movement(NREM) sleep: 70%-75%
Rapid eye movement(REM) sleep
REM sleep ( rapid eye movement) is less
affected if compared with the same effect of
other hypnotics.
Is that important? Yes, artificial interruption of
REM sleep causes irritability and anxiety even if
the total amount of sleep is not reduced.
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Benzodiazepines
• reduction of muscle tone and coordination
may be clinically useful: increased muscle tone is a common
feature of anxiety states and may contribute to pains
(headache). Influence of manual skills (!)
• anticonvulsant effects
clonazepam to treat epilepsy
diazepam (i.v.) status epilepticus to control life-threatening
seizures
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Pharmacological Effects of Benzodiazepines
are Concentration-Dependent.
• Nanomolar Concentrations
– Anxiolytic sedation – via a2 subunit.
– Action effectively blocked by flumazenil.
• Micromolar Concentrations
– Anesthesia – diazepam, midazolam, lorazepam.
– Activity due to binding of benzodiazepines to low-
affinity site on GABA-A receptor.
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Benzodiazepines
Unwanted effects• effects occuring during normal therapeutic use
• acute overdosage
• tolerance and dependence
Unwanted effects occuring during therapeutic use
Influence of manual skills (such as driving performance)
due to drowsiness, confusion, amnesia and impaired
coordination
enhance of depressant action of other drugs (in a more
than additive way)
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• They vary greatly in duration of action,
and can be roughly divided into
– Short-acting compounds: triazolam,
oxazepam(t1/2 2-3 h)
– Medium-acting compounds: estazolam,
nitrazepam (t1/2 5-8 h)
– Long-acting compounds: diazepam
(biphasic half-life of about 1–3 and 2–7
days for the active metabolite
desmethyldiazepam), flurazepam (50h)
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Benzodiazepines
acute overdosage (BZs are relatively safe in overdose)
- BZs produce prolonged sleep, without serious depression of
respiration or cardiovascular function
- severe even life-threatening respiratory depression may
appear in BZ combination with other CNS depressants,
particularly alcohol.
- acute overdosage can be counteracted with flumazenil
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Benzodiazepines
tolerance, dependence
tolerance occurs with all BZs; it appears to represent a change
at the receptor level
Discontinuation of benzodiazepine therapy in tolerant patients
MUST be gradual.
dependence – in human subjects and patients, stopping BZ
treatment after weeks and months causes an increase in
symptoms of anxiety, together with tremor and dizziness.
Addiction (craving -severe psychological dependence) is not a
major problem.
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New drugs
Zolpidem• binds selectively to the a1 subtype of BZ receptors and
facilitates GABA-mediated neuronal inhibition
• like the BZs, the actions of zolpidem are antagonised by
flumazenil
• minimal muscle relaxing and anticonvulsant effects
• the risk of development of tolerance and dependence
with extended use is less than with the use of other BZs
Zaleplon
• rapid onset and short duration of action are favorable
properties for those patients who have difficulty falling
asleep.
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ANTIPARKINSONICS
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History of Parkinson´s disease (PD)
First described in 1817 by an English
physician, James Parkinson, in “An Essay on
the Shaking Palsy.”
The famous French neurologist, Charcot,
further described the syndrome in the late
1800s.
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Epidemiology of PD
• The most common movement disorder
affecting 1-2 % of the general population over
the age of 65 years.
• 2.5% of the population older than 85
• The second most common neurodegenerative
disorder after Alzheimer´s disease (AD).
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Parkinsonism:
• degenerative disease of
CNS
• symptomatic
hypokinesia
muscle rigidity
tremor
postural lability
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Parkinson’s Disease Symptoms
• Secondary features of the disease:• Depression
• Dementia
• Dysphagia
• Anxiety
• Orthostatic hypotension
• Constipation
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Diagnostic Features
• Four Cardinal Signs
– T remor
– R igidity
– A kinesia and bradykinesia
– P ostural instability
» Signs start in one limb, usually an arm,
and spread to the other limb on that side
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Etiology
• Parkinson disease is
caused by the death
of the nerve cells in
the substantia nigra,
which produce the
neurotransmitter
dopamine.
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Famous Faces of Parkinson
Michael J. Fox
Muhammad Ali
Katharine Hepburn
Pope John Paul II
Johnny Cash
Mao Tse Tung
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Primary Known Causes
• Idiopathic—majority of cases
• Genetic
• Drug induced—Calcium Channel Blockers
• Toxins
• Head Trauma
• Cerebral Anoxia
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Imbalance primarily between the excitatory
neurotransmitter Acetylcholine and
inhibitory neurotransmitter Dopamine in
the Basal Ganglia
AChDA
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Pharmacotherapy (strategy)
• dopamine saturating agents:
levodopa
• dopamine receptor agonists
bromocriptine, ropinirol, pramipexol
• agents increasing dopamine effect:
rasagiline, tolcapon, entacapon
• agents increasing dopamine release:
amantadine
• acetylcholine bloking agents:
biperiden, procyclidine, trihexyfenidil
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Dopamine-saturating agents
Levodopa (L-DOPA)
1. choice drug
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L-DOPA
• L-DOPA can cross blood-brain barrier, when
dopamine cannot. This led to the idea of using L-
DOPA as treatment for PD.
• First used in the 1960’s, with daily increase
dosage program.
• L-DOPA used in combination with Carbidopa in
1967.
– Increases potency of L-DOPA up to 4-fold.30
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Mechanism of action
• dopamine receptors D1 a D2
• dopaminergic antiparkinsonics –
stimulation of D2 receptors
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Pharmacokinetics
• L-DOPA - rapid GIT absorption
• brain distribution - 1-3% only
• majority metabolised to dopamine in extracerebral tissues
• combination with carbidopa (inhibitor of dopa-decarboxylase) – 10% enter CNS
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• L-DOPA is converted to dopamine by
DOPA decarboxylase
33
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Carbidopa
• Carbidopa is an inhibitor of dopa decarboxylase.
• Because it is unable to penetrate the blood-
brain barrier, it acts to reduce the peripheral
conversion of levodopa to dopamine.
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Carbidopa - cont.
Virtue:
a. It can decrease the dosage of levodopa.
b. It can reduce toxic side effects of levodopa.
c. A shorter latency period precedes the
occurrence of beneficial effects.
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Clinical use
• L-DOPA can change all symptoms of parkinsonism
• effective mainly in rigidity, hypokinesia
• 65-70% patients answer in the begining of therapy
• decreased effectiveness – after few years
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Side effects 1
• GIT
- about 80% of patients - nausea, vomiting
- divide doses, apply with meal
- tolerance – after few weeks
- application with dopa-decarboxylase inhibitors –
about 20% vomiting
• CVS
- increase in catecholamine production in periphery:
arrhythmias
orthostatic hypotension
hypertension
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Side effects 2
• Diskinesia
• Behavioral changes depression
anxiety, agitation
insomnia
euforia- mainly in L-DOPA + carbidopa combination
• Other mydriasis
taste or smell abnormality
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Levodopa-note
• Sudden discontinuation can result in
fever, rigidity, and confusion.
•The drug should be withdrawn
gradually over 4 days.
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Dopamine receptor agonists or
agents increasing dopamine effect
Bromocriptine
Ergot alcaloid
derivative
Claviceps purpurea
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Mechanism of action
• 2. choice drug
• acts as partial agonist on D2 – receptors
in CNS
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Clinical use
• can be combined with L-DOPA
• therapeutic level should be reached in
2-3 months
• the dose of L-DOPA should decrease
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Side effects
• GIT
- nausea, vomiting, anorexia, constipation
• CVS
- hypotension, vasospasms (fingers), arrhythmias
• Diskinesia
• Mental disorders
- confusion, halucinations
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II. generation of dopamine
receptor agonists
• Ropinirol - D3/D2 agonist:
- similar effects as L-DOPA
• Carbegoline - D2 agonist
• Pramipexol - D3/D2 agonist
- monotherapy, in severe forms combination with
L-DOPA
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MAO-B inhibitors
Rasagiline
• inhibition of MAO B
• it prolongs L-DOPA effect dose
diminution
• Used as monotherapy or in conjunction
with L-DOPA, it can reduce the dosage
of L-DOPA by 15%.
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MAO-B Inhibitors
• MAO-B is an enzyme that metabolizes
dopamine.
• From the breakdown of dopamine, hydrogen
peroxide is produced, which the oxidative
stress can damage dopaminergic neurons in
the substantia nigra. (Possibly
neuroprotective)
• MAO-B inhibitor delays or reduces the
metabolism of dopamine. 48
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Rasagiline (selegiline)
• combination of rasagiline and levodopa
is more effective than levodopa along
in relieving symptoms and prolonging
life
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50
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• Side effects of L-DOPA may be enhanced by
selegeline.
• Nausea and dizziness.
51
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COMT Inhibitors
• COMT catalyses methylation of L-DOPA.
• Addition of COMT inhibitor along with L-DOPA
and carbidopa prolongs the half-life of L-
DOPA and increases the amount in the CNS.
– This increases “on” time for L-DOPA.
52
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COMT- inhibitors
Entacapon • peripheral COMT- inhibitor
• Decrease of L-DOPA degradation
• additive to L-DOPA+carbidopa
• L-DOPA dose diminution
• nausea, vomiting, hallucination
Tolcapon• strong peripheral central COMT inhibitor
• similar as entacapon (in patients with weak response to L-DOPA+carbidopa
• possible severe hepatotoxicity (nausea, vomiting, abdominal pain, unusual fatigue, loss of appetite, yellow skin or
eyes, itching, dark urine; death)
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Agents increasing dopamine
release
Amantadine
• antiviral agent
• increases dopamine release from nerve endings and also it blocks NMDA receptors
• short action, disappears after few weeks
• positive effects on rigidity, tremor
• can induce CNS disorders - depressions, sleep disturbancies
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Amantadine
• Amantadine may be more efficacious in PD than the anticholinergic atropine derivatives but is less effective than levodopa.
• It has been used alone to treat early PD and as an adjunct in later stages.
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Acetylcholine blocking agents
Biperiden, procyclidine, trihexyfenidil
• progressive begining of therapy
• influence rigidity, tremor
• important side effects
• continual discontinuation of therapy
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ANTIEPILEPTICS
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Definition
A chronic neurologic disorder manifesting by
repeated epileptic seizures which result from
paroxysmal uncontrolled discharges of
neurons within the central nervous system (grey
matter disease).
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Pathogenesis
• The 19th century neurologist Hughlings Jackson
suggested “a sudden excessive disorderly
discharge of cerebral neurons“ as the causation
of epileptic seizures.
• Recent studies in animal models of focal epilepsy
suggest a central role for the excitatory
neurotransmiter glutamate (increased in epi) and
inhibitory gamma amino butyric acid (GABA)
(decreased)
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Epilepsy
Etiology:
symptomatic epilepsy
idiopatic epilepsy (mainly in young
adults - 75%)
ideal antiepileptic drug – nonsedative!
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Famous Faces of Epilepsy
Caesar
Napoleon
Lenin
Van Gogh
Danny Glover
Prince
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Trigger mechanisms of
epilepsy
• hyperpyrexia (infections)
• CNS infections
• metabolic disorders (hypoglycemia, phenylketonuria)
• toxic agents (strychnine, lead, alcohol, cocaine)
• brain hypoxia
• expansive processes (tumors, bleeding)
• CNS developmental disorders
• brain trauma
• anaphylactic reactions
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Attack classification
partial attacks
• simplex partial attacks
• complex partial attacks
generalised attacks
• generalized tonic-clonic attacks (grand mal)
• absences (petit mal)
• tonic attacks
• atonic attacks
• clonic myoclonic attacks
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Epilepsy - Treatment
• The majority of pts respond to drug therapy (anticonvulsants). In intractable cases surgery may be necessary. The treatment target is seizure-freedom and improvement in quality of life!
• The commonest drugs used in clinical practice are: Carbamazepine, Sodium valproate, Lamotrigine (first line drugs) Levetiracetam, Topiramate, Pregabaline (second line drugs) Zonisamide, Eslicarbazepine, Retigabine (new AEDs)
• Basic rules for drug treatment: Drug treatment should be simple, preferably using one anticonvulsant (monotherapy). “Start low, increase slow“. Add-on therapy is necessary in some patients…
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Barbiturates
Phenobarbital
• belongs to the oldest antiepileptics (OBSOLETE)
• acts through inhibitory neurotransmitters
(GABA)
• inhibits the effect of excitatory
neurotransmitters (glutamate)
• in high doses blocks Ca2+ channels
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Clinical use
• rarely used (sedative effect)
• partial seizures
• grand mal
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Side effects
• sedative
• allergic reactions
• megaloblastic anemia
• increased porphyrine synthesis (CI in
porphyria)
• overdose, intoxication
• tolerance, dependence
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Other barbiturates
Primidon
metabolised to phenobarbital
• Clinical use
- partial seizures
- grand mal
• Side effects
- as phenobarbital
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Hydantoin derivatives
Phenytoin
• introduces in 1938
• significantly influences the movement of ions
across the membrane (Na+, K+, Ca2+)
• binds to membrane lipids membrane
stabilization
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Clinical use
• partial attacks
• generalised tonic-clonic seizures
• antidysrrhythmic
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Side effects
• nystagmus (early side effect)
• diplopia, ataxia, headache – dose adjustment
• hyperplasia of gums, hirsutism
• chronic application avitaminosis (D)
osteomalatia
• folic acid metabolism disorders
megaloblastic anemia
• allergic reactions skin
• teratogenic effects
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Iminostilbens
Carbamazepine
chemically similar to tricyclic antidepressants
• effect similar to phenytoin
• blocks sodium channel
• inhibits synaptic transmission
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Clinical use
• drug of choice in partial attacks
• effective also in grand mal
• neuralgia trigemini
• painful seizures in diabetic neuropathy
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Side effects
• diplopia ataxia
• GI intolerance
• restlessness, sleepness
• in elderly - fatal aplastic anemia,
agranulocytosis
• inducer of microsomal enzymes
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Suxinimides
Ethosuximide
• Mechanism of action
calcium channels T-type
calcium current responsible for
induction of cortical impulses in petit mal
• Clinical use
- petit mal
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Side effects
• GIT disorders (start therapy with low
doses)
• fatigue
• headache, vertigo, euphoria (rare)
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Valproic acid
Valproic acid sodium valproate
• mechanism of action - not fully understood
• inhibits GABA-transaminase
• aspartate level in brain
• possible change in membrane permeability
for K+ hyperpolarisation
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Clinical use
• absences
• myoclonic seizures
• generalised tonic-clonic seizures
• partial seizures (rarely)
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Side effects
• nausea, vomiting, abdominal pain
(progressive dose increase)
• weight alopecia
(about 10 % of patients)
• hepatotoxicity !!!(liver function monitoring)
• possible teratogenic effect
( incidence of spina bifida)
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Benzodiazepines
• diazepam – drug of choice in acute epileptic
attack (10 mg i.v.)
• lorazepam - as diazepam, more effective
• clonazepam – long acting, absences,
myoclonic seizures, highly effective
antiepileptic drug
• nitrazepam – some forms of myoclonic seizures
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Side effects
• important sedative
effect (use limitation)
• tolerance
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Newer antiepileptics
• GABA transaminase inhibitor: vigabatrin
• Na+ channel blocker: lamotrigine
• GABA analogue: gabapentine
• Aspartate excitatory effects antagonist:
felbamate
• As phenytoin with less side effects: topiramate
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GABA transaminase inhibitor
Vigabatrin
- irreversible inhibitor of GABA-transaminase
- concentrations of GABA
• Clinical use- drug of choice in complex partial seizures
• Side effects- sleepness, weight gain
- vertigo, confusion
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Na+ channel blocker
Lamotrigine
- inhibits also release of EA in brain cortex
• Clinical use
- broad spectrum antiepileptic
- drug of choice in partial generalised tonic-clonic
seizures
- preferentially in non responders to other therapy
• Side effects
- ataxia, vertigo, headache, diplopia, skin affections
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GABA analogue
Gabapentine
- easily crosses blood-brain barrier, enhances GABA
release
• Clinical use
- drug of choice in partial seizures
- first line for pain due diabetic neuropathy an
postherpetic neuralgia
• Side effects
- well tolerated
- fatigue, vertigo, headache, nausea,
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Aspartate excitatory effects
antagonistFelbamate
- in non-responders to other therapy
• Clinical use- in partial seizures
- in children in seizures in Lennox-Gaustat sy
(generalised myoclonic epilepsy with mental retardation)
• Side effects- nausea, insomnia, irritability – low incidence
- aplastic anemia hepatopathia – very rare but fatal
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Na+ channel block, GABA
potentiation
Topiramate
- similar as phenytoin, less side effects
- inhibits also glutamate receptors
- in children and adults
• Clinical use
- in partial seizures (simplex, complex)
- in children in seizures in Lennox-Gaustat sy
• Side effects
- CNS depression
- suspect teratogenic effect
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New AEDs
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Inhibition of neurotransmitter release
Levetiracetam
• It binds to SV2A (synaptic vesicle glycoprotein), and inhibits presynaptic calcium channels
• Reducition of neurotransmitter release
• Treatment of focal epilepsy and generalized tonic-clonic epilepsy
Adverse reactions
• The most common adverse effects - somnolence, decreased energy, headache, dizziness, mood swings and coordination difficulties
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Antagonists of an excitatory
effect of glutamatePerampanel
- Selective non-competetive antagonist of AMPA
receptors (for glutamate)
Indications
- Partial seizures
- generalized tonic-clonic epilepsy
Adverse reactions
- Psychical disorders (euforia, irritability,
aggresivity, psychosis, suicidal tendencies)
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• Zonisamid – MoA - ?, Na+, Ca2+ GABA
• Eslikarbazepín – stabilisation of inactiveNa+
channels
• Retigabín – mostly via opening of neuronal K+
channels – stabilisation of membrane potential
• Pregabalín – blockade of presynaptic Ca2+
channels - release of NE, Subst. P, glutamate
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Therapeutic choices
Seizure type 1st choice alternative or add-on
Tonic-clonic carbamazepine clobazam
phenytoin lamotrigine
valproic acid topiramate
Absence ethosuximide clobazam
valproic acid lamotrigine
topiramate
Partial (simple carbamazepine clobazam
or complex) phenytoin lamotrigine
valproic acid
phenobarbital
Acute epileptic attack: diazepam, lorazepam
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Antiseizure drugsUse of antiseizure drugs in other non-seizure conditions
Carbamazepine
mania, trigeminal neuralgia (possibly behavioural disturbances in dementia)
Gabapentin
neuropathic pain (possibly mania)
Lamotrigine
(possibly mania, migraine)
Phenytoin
(possibly neuropathic pain, trigeminal neuralgia)
Valproic acid
Mania, migraine (possibly behavioural disturbances in dementia)
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Status epilepticus
0-5 min - history, physical examination, intubation?, ECG
5-10 min – start 2 large bore IV saline, dextrose, thiamine, lorazepam or diazapam IV
10-30 min - Phenytoin or phenobarbital IV
30-60 min - If seizures persist after phenytoin, use phenobarbital or vice versa. Admit to CCU, get EEG, consider thiopental, propofol
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The Virgin Mary as advocate for a girl with epilepsy
(portrayed having a tonic seizure)