what is epilepsy its types and recent strategies apply to treat the epilepsy

1. PRESENTED BY:- GUIDED BY:-
MR.N.P.SAWADADKAR MR.V.J.CHAWARE
B.PHARM M.PHARM
Recent strategies to treat
Epilepsy

2. Content
 Introduction
 Classification of Seizures
 Causes of Epilepsy
 Conventional Antiepileptic Drugs
 Combination Therapy for antiepileptic Drugs
 Newer Antiepileptic Drugs.
 Other current prospectus to treat epilepsy.
 References.

3.  Epilepsy is the CNS disorder having recurrent seizures
that originate in the brain.
 The brain is made up of billions of cells which process
information from our senses, thoughts, emotions,
memories and actions.
 Seizures are the manifestation of an abnormal, hyper
synchronous discharge of a population of cortical
neurons
 Seizures are the result of a brief, temporary disruption
of the usual activity of the brain.
Introduction

4. • Such disruptions occur for a variety of reasons, not all of
which can be identified.
• Reasons can include brain damage, scarring, chemical
or hormonal imbalance, or tumours.
• Incidence of epilepsy in developed countries is
approximately 50 per 100,000 while that of developing
countries, it is 100 per 100,000.

5. Causes Of Epilepsy
There is no single cause of Epilepsy. Many factors can
injure the nerve cells in the brain. Which includes :-
 Head injury.
 Trauma at birth, or high fever.
 Excessively rough handling or shaking of infants.
 Certain drugs or toxic substances when administered in
large doses.
 Interruption of blood flow to the brain.

6. According to “American society of Epilepsy” the seizure
are classified as
 Primary generalised seizures
 Partial seizures
 Secondarily generalised seizures
Classification of seizure

7. Primary generalised seizures
 The whole brain is affected by the disruption to its usual activity
and consciousness is lost. Seizures in this category include:
 Absences – the person looks blank for a few seconds and may
not respond when spoken to or realise they have had a seizure.
 Tonic-clonic – the person stiffens, loses consciousness,
convulses and may fall.
 Tonic and atonic seizures, or drop attacks – the person may
stiffen and fall heavily or lose muscle tone and crumple to the
ground.
 Myoclonic – rhythmic, shock-like muscle jerks that can affect
the whole body and can be strong enough to throw the person to
the ground.

8. Partial seizures
Only part of the brain is affected and consciousness may
be altered but not lost. Seizures in this category include
 Simple partial seizure – the person may experience
unusual sensations and/or movement in one part of the
body, e.g. tingling or twitching.
 Complex partial seizures – awareness is disturbed or
lost and the person may experience unusual feelings.

9. Secondarily generalised seizures
 The disruption starts in one part of the brain and
spreads to the whole brain.
 Some seizures don’t fit into these categories and are
known as unclassified seizures.

10. Conventional antiepileptic drugs
 Long-term antiepileptic drug therapy is necessary for the
majority of patients with epilepsy.
 Around 75-80% of epileptic patients may be provided
with adequate seizure control with the help of
conventional antiepileptic drugs.
 phenobarbital, phenytoin , valproate , Carbamazepine,
ethosuximide, are the most frequently used conventional
antiepileptics.
 The therapeutic failure in 20-25% of patients has
stimulated intensive research on novel antiepileptic
drugs.

11.  Approximately 30–40% of patients do not achieve
seizure control with a single antiepileptic drug
(AED).
 most of the drugs have been developed and licensed
mainly as add-on treatment in patients poorly
responding to conventional therapy.
 Those patients who do not respond to single-agent
therapy, multiple antiepileptic agents is required.
Combianations of antiepileptic Drugs

12.  Deckers et al. Carried out a clinical trial of 130
adult-onset epilepsy patients.
 comparing CBZ monotherapy to a combination of
CBZ/VPA.
 The authors hypothesized that the combination of
low doses of CBZ and VPA would have fewer side
effects than CBZ monotherapy.
 No statistical difference between the two treatments
was found for seizure frequency or drug toxicity.

13.  Few other systematic studies are carried out for
examining comparative effectiveness of polytherapy
in humans.
 The study found that most common combinations
were Lamotrigine + Valporic acid, Lamotrigine +
Leveteracetam, CBZ + VPA , Leveteracetam +VPA,
and Topiramate + VPA .
 PHT+ PB , PHT + TPM was found to be potentially
ineffective.

14. Newer Anti-epileptic Drugs
 New antiepileptic drugs are available for the
treatment of various forms of seizures and the
epilepsy syndromes.
 Lamotrigine and Topiramate are effective as initial
monotherapy for generalized seizures.
 Topiramate,Lamotrigine, Oxcarbazepine and
Gababentin for partial seizures.
 Zonisamide is effective as an add-on therapy for
patients with partial seizures.

15.  Newer AEDs such as Pregabalin and Retigabine have
been shown to be effective against seizures and are
currently undergoing further clinical trials.
 Fosephenytoin, a Phenytoin is useful particularly in the
treatment of status epilepticus.
 The newer formulation of intravenous Valproate has been
approved for use in patients for whom oral administration
is temporarily not feasible.

16.  There are many chemical compounds have been tested
as antiepileptic agents.
 The drugs in most advanced development (including
clinical studies) are: atipamezole, BIA-2-093,
fluorofelbamate, NPS 1776, pregabalin, retigabine,
safinamide, stiripentol, talampanel, ucb 34714 and
valrocemide.
 Part of them is chemical derivative from marketed
AEDs,

17. Other current prospectus for
treatment of epilepsy
 Ketogenic diet-
 Keto –Ketone , Genic-Producing
 a highly fat, low carbohydrate diet developed with
the advent of effective anticonvulsants.
 The mechanism of action is not well known.
It is used mainly in the treatment of children with
severe, medically intractable epilepsies.

18.  Vagus nerve stimulation-
A small electrode is fitted in neck and attached to the
vagus nerve.
This electrode is linked to a small generator that is put
into your chest.
The device has a very low electrical pulse.
The device stimulates the vagus nerve at pre-set
intervals and intensities of current.
 It is programmed to stimulate this nerve to reduce
seizures.

19.  Responsive neurostimulator system (RNS)-
It consists of a computerised electrical device implanted
in the skull with electrodes implanted in presumed
epileptic foci within the brain.
The brain electrodes send EEG signal to the device which
contains seizure detection software. When certain
seizure criteria are met, the device delivers a small
electrical charge to other electrodes near the epileptic
focus and disrupt the seizure.

20. Surgical treatment of epilepsy
 Surgical treatment consists of the removal of an abnormal
brain area that has been identified as likely to be
responsible for the seizure.
 It is a procedure applied only to a select population of
people with epilepsy, namely those who have not
responded to aggressive medical therapy with AEDs.
 These patients are referred to as being medically
intractable.
 About80%of all such surgical procedures in adults
involve resections of the temporal lobe.

21. References
 Hart L. Clinical Pharmacy and Therapeutics. Williun and
Wilkins Press, Baltimore, USA, 2004,118-30.
 Clinical epilepsy, American epilepsy society,USA, c-4.
 Rout S.K., A review on antiepileptic agents, current research
and future prospectus on conventional and traditional drugs,
IJPSRR,2010,2, Article 004.
 Lee J ,Dworetzky B, Rational Polytherapy with Antiepileptic
Drugs, Pharmaceuticals, 2014, 3, 2362-2379.
 Boon P, Raedt R, Herdt V; Electrical Stimulation for the
Treatment of Epilepsy; Neurotherapeutics;2009;3;214-220.

22.  Ben-Menachem E. Vagus-nerve stimulation for the
treatment of epilepsy. Lancet Neurol 2002;1:477– 482.
 Stefan H, Wang Y, Pauli E, et al. A new approach in anti-
epileptic drug evaluation. European Journal of Neurology
2004; 11:467-73.
 www.epilepsyscotland.org.uk.

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