Bladderwrack
Hyperthyroid medication – May decrease effectiveness of drug due to natural iodine content.

Bladderwrack
Thyroid replacement therapies – May add to effect of drug.

Bugleweed
Radioactive iodine – May interfere with administration of diagnostic procedures using radioactive isotopes.

Bugleweed
Thyroid hormones – Should not be administered concurrently with preparations containing thyroid hormone.

Chaparral
Sulfur drugs, cortisone, chemo drugs – Interacts negatively with drugs, especially with sulfur drugs, cortisone and chemotherapy agents.

Dan Shen
Warfarin – May potentiate effect of drug.

Echinacea
Immunosuppressant medication – May decrease effectiveness of drug.

Garlic
Warfarin – May potentiate effect of drug.

Ginger
Warfarin – Increased risk of spontaneous bleeding, particularly at levels greater than 4 gms/day ginger.

Gotu Kola
 Accelerates the action of penicillin and sulfur drugs. allow at least 2 hours between the two.

Green Tea, Chamomile, Lime Flower, Vervain Rosemary, & other herbs high in polyphenols
Iron – Inhibition of non-heme iron absorption where iron supplementation is required; do not take simultaneously with meals or iron supplements.

Korean (Panax) Ginseng
MAO inhibitors – May cause headaches and tremor, mania.

Licorice
Anti-hypertensive medications – May decrease effectiveness of drug when licorice consumed long-term at doses greater than 100 mg/day glycyrrhizin.

Licorice
Digoxin – Excessive licorice intake causes hypo-kalemia, which can potentiate the toxicity of the drug; therefore avoid long-term use of licorice at doses greater than 100 mg/day glycyrrhizin.

Licorice
Thiazide diuretics and other potassium depleting drugs – The combined effect of licorice and the drug could result in excessive potassium loss; avoid long-term use of licorice at doses greater than 100 mg/day glycyrrhizin.

Nervine and “mood altering” formulas (Valerian, Passion Flower, Wood Betony, Scullcap, Hops, Kava Kava, St John’s Wort)
Anti-depressants, anti-psychotics, anxiety drugs, tranquilizers, sleep medications – Allow at least 3 to 4 hours between psychiatric or anti-psychotic drugs or mood altering drugs.

St John’s Wort
Chemotherapeutic drugs – Decreases drug levels.

St John’s Wort
Digoxin – Decreases drug levels at doses greater than 1 g/day dried herb.

St John’s Wort
HIV non-nucleoside transcriptase inhibitors – Decreases drug levels.

St John’s Wort
Immunosuppressives – Decreases drug levels.

St John’s Wort
HIV protease inhibitors – Decreases drug levels.

St John’s Wort
Phenprocoumon – Decreases plasma drug levels.

St John’s Wort
Warfarin – Decreases drug levels.