Download - Herbal Treatments In Epilepsy
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Herbal Treatments in Epilepsy
F.A.C.E.S. Evening Lecture Series
June 16, 2009
Siddhartha S. Nadkarni, M.D.
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and yes I said yes I will yes
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if it was out there we wouldn’t be having this talk.
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• Stone cutters were quacks in the middle ages who would do surgery to remove the “stone” that was causing sz. There would be a cross shaped incision made in the back of the head.
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Editorial• Randomized Controlled Blinded trials:
– Doctors and patients are both biased– Placebo effect is not nothing– RCT’s are our best method to date to
assess efficacy given how much we don’t know about the brain
– Double blind– Anecdote Vs. Parachute– The power of mind (placebo revisited)
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Complimentary and Alternative
• CAM– On the rise– 42% US– 65% Germany– 20% UK– 1/6 people taking Rx also take Herbal– > 50 y.o.: 2.66 herbals and 2.26 Rx
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CAM
• < 40% share their use with Drs.
• Legislation requiring regulation/licensing of Herbs in Germany, France, Sweden, Australia.
• In US the Dietary Supplement Health and Education Act of 1994 removed these products from FDA jurisdiction
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CAM and Epilepsy
• Ohio study of 92 patients:– 24% using CAM– Of which 41% used herbs
• Nigerian study of 265 patients:– 47.6% using only traditional African med.
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• Herb:– 1.) a seed producing annual, biennial, or
perennial that does not develop persistent woody tissue but dies down at the end fo a growing season
– 2.) a plant or plant part valued for its medicinal, savory, or aromatic qualities
– 3.) slang…
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• Qingyangsen roots – open label study showing improved seizure control as adjunct treatment in 9/32 patients– Postulated in one animal study that when used in
combination with PTN may reduce early production of fos protein
• 13 Herb mixture (100pt) compared to phenobarbital control (40 pt)- open label study, similar efficacy with decreased side effects
• Zhenxiangling (main ingredients peach flower buds and human placenta)- open label study, >75 % seizure reduction in 66% and > 50% in another 30%
(Tyagi et al, 2003)
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• Japanese Kampo medicine• TJ- 690 (mixture of 9 herbs)- small trial (26pt)
showing improvement in seizure control and cognitive function
• Indian Ayurvedic medicine• Ashwagandha, Brahmirasayan and
Brahmigritham have been used for centuries to control seizures
• Mentat (BR-16A) widely used in conjunction with AEDS in current Indian practice– Decreases Phenytoin metabolism and
increases bioavailability of Carbamazepine
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• Vincent Van Gogh• Complicated birth history, family history, pip, etc.• “Sorrow is eternal.” His last words spoken to his
brother on his deathbed.
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Van Gogh and Herbs
• Wormwood (artemesia absinthium)
• Used to distill alcohol
• Contains terpene thujone, a proconvulsant
• Had Hallucinatory convulsions
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Herbal Therapies
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Herbs for Epilepsy• Valerian root• Skullcap• European Mistletoe • Marijuana• Black cohosh• Lobelia• Kava• Hyssop• Blue vervain• Yarrow• Geranium• Kelp• Bupleurum• Passion flower• Carline thistle• Elderberry• Mugwort
• Lady’s slipper• Aloe• Betony• European Peony• Ginseng• Flax seed oil• Ginger• Linden• Chrysanthemum• Forskolin• Behen• Burning bush• Calotropis• Gotu Kola• Groundsel• Lily of the Valley• Tree of Heaven• Yew
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How often do people take herbs?
Overall use of complementary and alternative medicines (CAM) in U.S. 1990-1997.
• Herbal product use increased 4x• In 1997, adults - 33 million office visits regarding herbal
products & high-dose vitamins; spent ~$8 billion• In 1997, ~15 million adults took prescription medications with
herbs and/or high-dose vitamins
Eisenberg et al. JAMA 1998;280:1569-75.
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How often do people take herbs?
Herb U.S. sales
($ millions)
Gingko biloba 150
Echinacea 70
Garlic 50
Ginseng 40
Soy 35
Saw palmetto 30
St. John’s wor 30
Valerian 16
Top 10 selling herbs and dietary supplements: 2002
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How often do persons with epilepsy take herbs?
U.S. and England studies:• Up to 1 in 3 persons with epilepsy use CAM • Most do not discuss their CAM use with doctors• Herbs taken include ginseng, St. John’s wort, melatonin,
gingko biloba, garlic and black cohosh• Treat seizures (<10%), other symptoms (20%), and general
health (>70%)
Peebles et al. Epilepsy Behav 2000;1:74-7
Easterford et al. Epilepsy Behav 2005;6:59-62
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Case Presentation1. 35-year-old woman with epilepsy for 18 years, on
carbamazepine and an oral contraceptive.2. For several months, feeling depressed, though
functions well day to day.3. Hasn’t mentioned symptoms to doctor. 4. St. John’s wort is an herb for mild depression.
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Case Presentation, cont.You go to a health foods store and look at different bottles of St. John’s wort.
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Case Presentation, cont.1. What do the disclaimers on the labels
mean? 2. What about the quality of the products
1. Does the FDA control the manufacturing and testing of St. John’s wort, as it does for the testing and manufacturing of prescription drugs?
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Federal regulation of herbs• Herbal products are classified by the
government as dietary supplements.• Dietary supplements are regulated by the 1994
Dietary Supplement and Health Education Act (DSHEA); prescription drugs - much more rigorous requirements of the Federal Food, Drug, and Cosmetic Act.
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Federal standards by DSHEA• Claim -- an effect on bodily structure
or function, not against a specific disease.
• Label must include a disclaimer that FDA has not evaluated the product
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Federal regulation of herbs
• Not required to be produced under Good Manufacturing Process standards, like drugs
• No government agency (eg, FDA) independently verifies the quality/production
• Could be contaminated with microbes, pesticides, toxic metals, or adulterated (eg, herbs or drugs)
• Potency and amount per pill/capsule may vary significantly within the same bottle or from batch to batch, or from one branded product to another
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Federal regulation of herbs
Standards set forth by the DSHEA:• Manufacturers are responsible for the
truthfulness of labeling claims• No government agency independently reviews
and verifies the claims and supporting evidence
• Only manufacturers control product quality and verify safety
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Case Presentation, cont.1. What do the disclaimers mean?2. What about their quality, whether the
FDA controls the testing of St. John’s wort?, how is it manufactured?
3. What about the amount of active ingredients?
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Standardization• How much of the active ingredient? • For example, bottle says “carbamazepine 200 mg”• This is a major problem for herbal products because
– the active ingredient (s) are usually not known – the amount of the assumed active ingredient may vary from
pill to pill and product to product– it is usually not possible to measure levels in the blood to
guide dosage
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? The active ingredient
• St. John's wort standardized by its content of hypericin (typically to 0.3% hypericin)
• Hypericin not confirmed as the active ingredient
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Case Presentation, cont.You wonder whether St. John’s wort could affect your carbamazepine or birth control pill, and whether it is safe and actually helps depression
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Herbal Anticonvulsants: Mechanisms
• Sedative effect/improved sleep: Valerian, Kava, Lobelia, passion flower.
• Increase in brain GABA/GABA receptors (Valerian, Kava)
• Agonist of benzodiazepine receptors (Passion flower).
• Antioxidants (TJ-960)
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Herb/AED Interactions• Don’t use Valerian or Kava with alcohol,
barbiturates, benzos- sedation/coma.• Hemorrhagic complications with Gingko and
St. John’s wort.• St. John’s wort can lower carbamazepine
levels.• Shankapulshpi (Ayurvedic formula)
decreases 1/2 life of phenytoin and decreases its efficacy.
• Tell your physician about herb use; anticipate potential for interactions.
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Herbs and Seizure Medications
• Increase Side effects– Valerian Root– Kava Kava– Passion Flower– Chamomile
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Herbs that cause Seizures• Kava Kava: GTC from toxicity and withdrawal.• Marijuana: intoxication or withdrawal.• Skullcap: confusion and convulsions with high doses.• Ma Huang: has ephedrine, pseudoephedrine, lowers threshold.• Gamolenic acid lowers seizure threshold: evening primrose oil,
borage (starflower). • Goldenseal: hydrastine lowers threshold.• Ginseng: lowers threshold.• Ginkgo biloba: GTCs reported. Neurotoxin 4’-o-
methylpyridoxine.• Thujone-containing herbs: wormwood, sage; lower threshold.
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Herbs and seizures
• Worsen seizures– Ephedra– Ma Huang– Mate– Guarana– Borage oil– ? Ginkgo– ? Ginseng
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Side-Effects of Herbs• Natural doesn’t equal safe!
• Herbs and herbal preparations contain many compounds.
• Black cohosh, Valerian, green tea have tannins - can affect absorption of Ca, Cu, Fe, Mg.
• Black cohosh can cause miscarriage via uterine stimulation.
• Lobelia - respiratory paralysis and death.
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Herbal Therapies
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Traditional Chinese Herbal Medicine (TCHM)
• Epilepsy therapy since 770 B.C.
• Principles of “Yin Yang Wu Xing”
• No well controlled studies
• Numerous laboratory studies show antiepileptic effects for many
• Many preparations are compound
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Melatonin
• Natural hormone
• Promotes sleep
• Used in various neurological conditions
• Antiseizure properties reported clinically in humans (small series, anecdotes) and dogs (nocturnal seizures) and experimentally in rodents
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Melatonin’s Effects
• Anti-oxidant
• Blocks effects of glutamate (neuroprotective)
• Enhances GABA actions
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Clinical Use of Melatonin in Epilepsy Patients
• Given orally 30-60 minutes before bedtime
• Dose ranges from 1-10 mg
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Herbal Issues
• Good
• Bad
• Ugly
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Good
• Our bias in Western Medicine is entrenched and should always be in front of our eyes
• Ancient traditions often survive for the efficacy of their system and treatments:– Ayurveda– Chinese Medicine
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Bad• Effects on Serum Concentration of AED’s
(Herb-Drug interactions) P450 enzymes:– St. John’s wort– Garlic– Echinacea– Pine bark extract– Pygenol– Milk thistle– American hellebore– Gingko– Mugwort– Pipissewa
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Samuels et al, 2008
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Ugly
• Many herbs have been reported to be pro-convulsants
• These are both in laboratory/mice models and in case reports in humans
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Samuels et al, 2008
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Samuels et al, 2008
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Data
• As of 2005:– 3 randomized controlled trials– 5 non-randomized controlled trials– 6 case control studies– 57 observational studies, case reports– Only one since 2005 of herbs in epilepsy– 135 herbs– Poorly done studies
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Case Study
• 27 y.o. woman with frequent auras and monthly complex partial seizures who is exquisitely sensitive to medication asks her doctor about Marijuana. She says her father had refractory seizures until he moved to Toronto where he could get it freely and has been seizure free since taking it regularly.
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• Canada• Alaska• Arizona• California• Colorado• Hawaii• Maine• Nevada• Oregon• Rhode Island • Vermont• Washington
Alfred Nobel
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• Contains approximately 60 active substances
• Primary active chemicals:– Delta 9 tetrahydrocannibinol– Delta 8 tetrahydrocannibinol– Cannabidiol
Edgar AllenPoe
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• G-protein coupled cannabinoid CB1 receptors
• Abundantly distributed in the BG, cerebellum, limbic system and cortex
• Endocanabinoids act as retrograde messengers at many central synapses causing inhibition of neurotransmitter release
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• Evidence that endocannabinoid system facilitates neuroprotective activity at baseline
• The system appears to be upregulated in response to various brain insults.
Neil Young
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• ? THC beneficial in partial epilepsy and detrimental in generalized epilepsy
• ? CBD more of anticonvulsant
• One epidemiologic study of drug use and new onset seizures found that marijuana may be protective against first seizures in men
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Long term effects of cannaboids?
- Impaired memory
- Marijuana amotivational syndrome
Lenin
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Marijuana• First used as antiepileptic in 19th century.• Cannabinoid receptors in brainstem, limbic system,
cortex.• Mixed results• THC has anti- or proconvulsant affects depending on
dose and epilepsy model.• Many cannibiols - variable effects• Epidemiologic study- may be protective against first
seizures in men• Has other potentially negative health consequences
(e.g., cardiovascular, pulmonary). ?? withdrawal seizures.
• Illegal and therefore cannot be prescribed except for states with medical marijuana
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Gross et al, 2004
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Gross et al, 2004
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• There are likely some who will benefit from THC
• There are likely some who will have worsening seizures from THC
• Other effects of THC most likely outweigh benefits in most cases
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Take Home
• In any given person herbs may be helpful, but in most they likely are not
• In any given person herbs may worsen epilepsy
• Herbs definitely can effect AED levels• No good studies• Communication between doctors and patients
is crucial• Perspective