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This is a list of warnings and contraindications for specific herbs. This
information is designed as a quick reference convenience for research and educational
purposes and does not constitute a complete listing of the warnings and contraindications
of each botanical.
5-HTP
 | contraindicated with
serotonin enhancing antidepressants, weight control drugs, or any other
serotonin-modifying agent
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Arginine
| can stimulate viral
replication
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Bilberry
| may cause hypoglycemia
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Bromelain
| increases the absorption of
amoxicillin
|
| acts as a blood thinner
|
| Consult a physician before supplementing
while on anticoagulants
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Citrus Pectin
| soluble fiber can interfere
with the absorption of lovastatin
|
Coenzyme Q-10
| if has congestive heart failure,
do not stop taking suddenly; abrupt withdrawal may exacerbate symptoms
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DHA
| blood clotting times do
decrease with supplementation but are still within normal range
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| Consult a physician before supplementing
while on anticoagulants
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Dong Quai
| inhibits platelet
aggregation
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| Consult a physician before supplementing
while on anticoagulants
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Echinacea
| contraindicated in
autoimmune illness like lupus, HIV, multiple sclerosis, tuberculosis
|
| contraindicated if have
daisy allergy
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Garlic
| inhibits platelet
aggregation
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| increases fibrinolysis
decreasing coagulation
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| Consult a physician before supplementing
while on anticoagulants
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| Garlic is a reputed abortifacient and has been reported to affect
the menstrual cycle. It is also reported to be uteroactive. However, there is no
experimental or clinical documentation suggesting adverse effects of consuming garlic
during pregnancy and lactation |
Ginko
| can decrease leg pain from walking
(intermittent claudication) but only at higher than recommended doses, do not use for this
indication
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Ginseng, Panax
| contraindicated in
uncontrolled high blood pressure
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Glucosamine
| may increase cholesterol
and/or triglycerides
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Hawthorn
| caution with ACE
inhibitors, cardiac glycosides
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Horse Chestnut
| contraindicated with kidney or liver
problems
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Kava Kava Root Extract
| contraindicated with
alcohol, barbiturates, antidepressants, and antipsycotic drugs
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Kelp
| iodine (from kelp) can interfere with
normal thyroid function
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Ma Huang Extract
| contraindicated with heart
disease, high blood pressure, thyroid disease, diabetes, enlarged prostate
|
| contraindicated with
antidepressants, mono amine oxidase inhibitors (MAO inhibitors)
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N-acetyl-L-cysteine
| may increase urinary zinc
excretion
|
Schisandra Fruit Extract
| use caution with fever,
acute infection, liver damage
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St. Johns Wort
| may decrease digoxin levels
up to 33%
|
| if at steady state on
digoxin while taking St. Johns Wort do not abruptly discontinue, digoxin levels will
increase
|
| may decrease blood levels
of indinavir (Crixivan); FDA advises not to use with protease inhibitors
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Vitamin B-6
| more than 200mg per day can
damage sensory nerves
|
| pregnant or lactating
should not take more than 100mg per day
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Vitamin D
| contraindicated in
sarcoidosis
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| contraindicated in
hyperparathyroidism
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Vitamin E
| Inhibits platelet aggregation
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| Consult a physician before supplementing
while on anticoagulants
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White Willow Bark Extract
| same contraindications and
warning as aspirin
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Yohimbine
| contraindicated with kidney
disease
|
| contraindicated with peptic
ulcer
|
| hypertension and aggressive
behavior may also occur
|
| combined with foods high in
tyramine (cheese, red wine, liver) can cause severe hypertension
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Zinc
| Inhibits copper absorption
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| copper intake should be increased if zinc
supplementation continues for more than a few days
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Last modified: August 28, 2000
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Herbal
Pharmacist - For Better Health 
