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Herbal and Natural Medicines: What You Should Know Mandy Leonard, R.Ph., Pharm.D., BCPS Drug Information Specialist Department of Pharmacy The Cleveland.

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Presentation on theme: "Herbal and Natural Medicines: What You Should Know Mandy Leonard, R.Ph., Pharm.D., BCPS Drug Information Specialist Department of Pharmacy The Cleveland."— Presentation transcript:

1 Herbal and Natural Medicines: What You Should Know Mandy Leonard, R.Ph., Pharm.D., BCPS Drug Information Specialist Department of Pharmacy The Cleveland Clinic Foundation April 2004

2 Objectives Review the reasons why people are using herbal/ alternative medicines. Describe risks from the consumption of herbal/ alternative medicines. Describe briefly changes in law regarding dietary supplements. Discuss commonly used dietary supplements, including herbal medicines. Review reputable sources of information regarding herbal/alternative medicines.

3 Introduction Definitions –Food and Drug Administration (FDA) –World Health Organization (WHO) Homeopathy Over 20,000 herbal and other natural products available in the United States. Economics Widespread use

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5 Top-Selling Herbs in Mainstream Market in U.S. 2001 Gingko ($46) Echinacea ($40) Garlic ($39) Ginseng($31) Soy($28) Saw Palmetto ($25) St. John’s wort($24) Valerian($12) Cranberry ($11) Black cohosh ($10) Kava kava ($ 9) Milk thistle ($ 7) Evening primrose ($ 6) Grape seed ($ 4) Bilberry ($ 4) Yohimbe ($ 2) ($ in millions; Herbalgram 2002;55:60.)

6 Top-Selling Herbs in Mainstream Market in U.S. 2002 (  13.9%) Garlic ($34) Ginkgo ($32) Echinacea ($32) Soy ($28) Saw Palmetto ($23) Ginseng ($21) St. John’s wort($15) Black cohosh($12) Cranberry ($11) Valerian ($ 8) Milk thistle ($ 7) Evening primrose ($ 7) Kava kava ($ 6) Bilberry ($ 3) Grape seed ($ 3) Yohimbe ($ 2) ($ in millions; Herbalgram 2003;58:71.)

7 Herbal versus Conventional Medication Disappointment with current conventional therapies Fear of safety and long-term effects Lack of effective treatments/cures

8 Herbal versus Conventional Medication Belief that herbal products are safe because derived from nature Peer influence Desire to have control of one’s own health False claims from manufacturers

9 Safety Considerations Forty to 70% of patients do not inform physicians about use of alternative therapies Adverse reactions –One or more chemical component of the plant –Inappropriate or incorrect manufacturing process –FDA does not require reporting of adverse reactions from alternative therapies (MedWatch and SN/AEMS) –Examples: L-tryptophan, ephedra (ma haung)

10 Safety Considerations Standardization –Nomenclature and chemical constituents vary –Mixtures are NOT standardized Lack of Good Manufacturing Practices (GMPs) Examples: ginseng, ephedra –Difficult to identify ingredients –Lack of active ingredient –Contamination

11 Unsafe Herbal Therapies Licorice –Glycyrrhiza glabra –Peptic ulcers –High doses (pseudoaldosteronism) –Use no longer than 6 weeks –Contraindications –Drug interactions Digoxin, furosemide Ephedra (ma haung) –Ephedra sinica –Anorexiant, decongestant –1% ephedrine –Palpitations, MIs, death –Maximum recommended dose: 100 mg/24 hours –Contraindications –Drug interactions Theophylline, digoxin, caffeine

12 Ephedra Products containing ephedra account for 64% of all adverse reactions to herbs in the US Less than 1% of herbal product sales FDA announced ban on 12/30/2003 After Mid-March 2004, illegal to manufacture or sell dietary supplements that contain ephedrine and related alkaloids Does not include teas

13 Kava (Piper methysticum) Anxiety, stress, sleep disorders (kavapyrones) May be effective for short-term treatment of anxiety (similar to Valium ® and Ativan ® ) Hepatoxicity: liver failure and liver transplantation –FDA warning; Canada and some European countries- market removal –Kava dermopathy Use no > 4 weeks; no alcohol/sedating medications; caution when driving or operating heavy machinery

14 FDA Proposed Labeling and Manufacturing Standards Designing/construction of physical plants Establishing quality control procedures Testing manufactured dietary ingredients and supplements –Five out of 18 soy or red clover-containing products Only 50 to 80% of declared isoflavones –Niacin Almost 10 times more niacin –Folic acid Only 35% of what was stated on label

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17 United States Pharmacopeia (USP) Dietary Supplement Verification Program (DSVP)

18 ConsumerLab.com

19 NSF International

20 Potential Warfarin-Herb Interactions Ginger –Additive effect –Avoid supplements, but small amount in diet should not be problematic Garlic –Additive effect –Avoid supplements, but small amount in diet should not be problematic Feverfew –Additive effect –Monitor or avoid St. John’s Wort –Increased metabolism & decreased effect of warfarin –Monitor or avoid

21 Consumer Survey Herbal use, products, and willingness to inform health care practitioners 794/1300 surveys returned –42% (n=330): Herbal product use –Common herbal products (aloe, garlic, ginseng, echinacea, and St. John’s wort) –Women (majority) –Higher education (75%) –Herbal users = more prescription medications –Herbal users = negative perception of prescription medications Pharmacother 2000;20(1):83-7

22 Laws and Regulations 1994- Dietary Supplement Health and Education Act (DSHEA) –Definition (dietary supplements not categorized as food additives) Premarketing approval –Burden of proof that product is adulterated or unsafe rests on the FDA (e.g., ephedra) –“Third-party Literature” Balanced view of available data –Structure/Function Statements

23 Structure/Function Statements “This product is not intended to diagnose, treat, cure or prevent a disease.” Change in definition of disease Examples: –Absentmindedness and hair loss associated with aging –Hot flashes –Premenstrual syndrome Herbalgram 2000;48:32-8

24 Ginkgo (Ginkgo biloba) –Leaves of the ginkgo biloba tree –Distinct chemical components Work synergistically –Improves blood flow (brain and heart) –Protects against oxidative damage from free radicals (antioxidant) –Inhibits effects of platelet activating factor (PAF)

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26 Ginkgo: Efficacy Data demonstrate ginkgo leaf extract can stabilize or improve some measures of cognitive function and social functioning in patients with multiple types of dementia. No direct comparisons to conventional medications for dementia. Modestly improve visual memory and speed of cognitive processing in non-demented patients with age-related memory impairment.

27 Ginkgo: Adverse Effects & Drug Interactions Adverse Effects: –Hypersensitivity reactions, gastrointestinal disturbances –Spontaneous bleeding (few case reports) Drug Interactions: –Anticoagulants (Coumadin ® ) –Antiplatelets (aspirin, Plavix ®, Ticlid ® ) –Insulin

28 Ginkgo: Dose and Administration Standardized: 24% flavone glycosides and 6% terpenoids (leaf extract) Dementia: –120 to 240 mg ginkgo leaf extract administered orally in two or three divided doses

29 Ginkgo: Summary Mild-to-moderate vasoactive agent Data promising in Alzheimer’s Disease Used extensively in Germany No comparison to standard of care Well-tolerated (weeks to 1 year) Potential drug-herb interactions with anticoagulants, antiplatelets, and insulin

30 Ginseng Each type of ginseng is unique –Asian or Oriental ginseng (Panax ginseng) –Siberian ginseng (Eleutherococcus senticosus) –American ginseng (Panax quinquefolius) Active ingredients : Root (panaxosides) Ginsenoside Rb-1 –Central nervous system depressant –Lowers blood pressure Ginsenoside Rg-1 –Central nervous system stimulant – Raises blood pressure

31 Panax Ginseng: Efficacy Data demonstrate possibly effective: –Improving abstract thinking, selective memory, and mental arithmetic skills (more effective in conjunction with ginkgo biloba leaf extract) –Improving resistance to stress –Controlling blood glucose levels in people with non-insulin dependent diabetes (Type 2) Possibly ineffective for enhancing athletic performance in healthy, young adults

32 Panax Ginseng: Adverse Effects & Drug Interactions Adverse Effects: –Nervousness, insomnia, excitation, palpitations, affects blood pressure, lowers blood glucose, alters immune functiom –Ginseng abuse syndrome? (long-term use) Drug Interactions: –Antidiabetic agents –Warfarin (Coumadin ® )

33 St. John’s Wort (Hypericum perforatum) Common forms: capsules, tablets, tinctures Source: –Flowering tops –Naphthodianthrones (one of many potential active components) Hypericin - Inhibits MAO A > MAO B Hyperforin: Modulates effects of serotonin –Serotonin inhibition at high concentrations –Norepinephrine inhibition –Catechol-O-methyl-transferase (COMT) inhibition

34 St. John’s Wort: Efficacy For the treatment of mild-to-moderate depression, data demonstrate that St. John’s wort is: –Superior to placebo –As effective as low-dose tricyclic antidepressants (TCAs; Elavil ® and Pamelor ® ), –Possibly as effective as selective serotonin reuptake inhibitors (SSRIs; Prozac ®, Zoloft ®, Celexa ®, and Lexapro ® )

35 St. John’s Wort: Adverse Effects & Drug Interactions Adverse Effects: –Sun-exposure: Photosensitivity/Phototoxicity (hypericin component; watch if taking antibiotics) –Insomnia, vivid dreams, headache, dizziness Drug Interactions: –MAOIs, selective serotonin reuptake inhibitors (SSRIs), Imitrex ®, tramadol (Ultram ® ): Increased serotonin –Cyclosporine (Neoral ® ): Decreased levels –Warfarin (Coumadin ® ): Decreased INR (lab test) –Oral contraceptives or hormone replacement therapy: Breakthrough bleeding

36 St. John’s Wort: Dose and Administration Standardized extract –0.3% hypericin –5% hyperforin Mild-to-moderate depression: –300 mg Administed orally three times a day –Doses of 1200 mg/day have also been used

37 Echinacea (Echinacea angustifolia, pallida, purpurea) Common Forms: tablet, juice, tea Purple coneflower Source: Applicable parts are the roots and above ground parts. Pharmacologic action [constituent(s)?] Indirect antiviral activity Immune system stimulatory effects –Cytokines, monocytes, natural killer cells

38 Echinacea: Efficacy Echinacea is possibly effective for –Reducing symptoms associated with influenza-like upper respiratory infections such as the common cold and flu. –Evidence suggests reduction in duration and severity of symptoms if started when symptoms are first noticed and used for 7 to 10 days. Possibly ineffective for preventing the common cold or influenza when taken prophylactically.

39 Echinacea: Adverse Effects & Drug Interactions Adverse Effects: –Allergic reactions ragweed, daisies, marigolds –Fever, nausea, vomiting, unpleasant taste, and dizziness –Atopy; more likely to experience allergic reaction Drug Interactions: –Immunosuppressants: Interfere with therapy –Medications used for transplant patients, cancer patients, and patients with multiple sclerosis

40 Echinacea: Dose and Administration Wide variety of doses depending on formulation Difficulty in standardization (echinacoside, alkamide content) Purpurea herb juice: 6 to 9 mL for 8 weeks Purpurea crude extract: 2 tablets administered orally three times a day Tea: 5 to 6 cups on day 1 of symptoms, then 1 cup/day for 5 days

41 Echinacea: Summary Formulation/species that offer most benefit is unclear. E. purpurea pressed juice or E. pallida root extracts at first sign of cold If taken greater than 8 weeks –Reduced immunostimulatory effects? – One week drug holiday (not substantiated) Well-tolerated (up to 12 weeks)

42 Dietary Supplements: Immune-Stimulating Properties Alfalfa Panax ginseng Astragalus Cat’s claw Coenzyme Q10 DHEA Echinacea Garlic Goldenseal Grape seed extract Melatonin Siberian ginseng

43 Dietary Supplements- Potential Interaction with Steroids Aloe Asian (Panax) ginseng Bayberry Licorice

44 Herbal Use in Patients Undergoing Surgery Approimately 26% of patients scheduled for surgery use herbal products –Cardiovascular instability –Prolongation of anesthesia/sedation –Bleeding –Electrolyte disturbances –Immunosuppression Anaesthesia 2002;57:889-99

45 Discontinuation of Use Before Surgery Echinacea –No data –Immunosuppression Ephedra (ma huang) –24 hours –Cardiac cautions Garlic –7 days –Bleeding Gingko –36 hours –Bleeding Ginseng –7 days –Hypoglycemia; Bleeding Kava –24 hours –Sedation St. John’s Wort –5 days –Drug-herb interactions Valerian –No data –Sedation JAMA 2001;286(2):213

46 Herbal References Natural Medicines Comprehensive Database –$92/year (book or web version) –$132/year (book and web version) The Review of Natural Products –$160/year (bimonthly updates) The Professional’s Handbook of Complimentary and Alternative Medicine –$40/edition

47 Natural Medicines Comprehensive Database

48 The Review of Natural Products

49 Herbal Medicine: Expanded Commission E Monographs

50 PDR for Herbal Medicines

51 American Botanical Council (ABC)

52 Herbal References The United States Pharmacopeia and The National Formulary (USP-NF) –$526/edition –21 botanical monographs (since 1995) Internet Reference –The Natural Pharmacist (www.tnp.com) Conditions Drug Interactions Review of published articles Search

53 Herbal References The Herbal Internet Companion –Herbs and Herbal Medicine Online –$20 (ISBN 0-7890-1052-6)

54 IBIDS Database International Bibliographic Information on Dietary Supplements –Office of Dietary Supplements (ODS) at the NIH –Published, international, scientific literature Vitamins, minerals, and botanicals –Over 676,000 unique scientific citations abstracts –Three databases Full IBIDS database Peer-Reviewed Citations Only database IBIDS Consumer database

55 CARDS Database Computer Access to Research on Dietary Supplements –Office of Dietary Supplements (ODS) at the NIH –Specific mandates from the DSHEA –Federally funded research projects pertaining to dietary supplements –Free of charge –www.ods.od.nih.gov

56 Summary Tell physician, nurse, and pharmacist about herbal therapy use (documentation) “Natural” does not mean safe Herbal-pharmaceutical interactions do occur Lack of standardization (variability in herbal content and efficacy among manufacturers) Lack of quality control and regulation (contamination and misidentification)

57 Conclusions Because of lack of efficacy and toxicity information, patients and clinicians should be aware that advice about herbal therapies is not absolute and is a matter of judgment. Base advice on available knowledge that is congruent with your needs and the clinician’s best judgment Majority of recommendations are NOT evidence-based

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