Herbalism Herb-Drug Interactions 2 — Questions and Answers
Question 1: Ginkgo biloba should be used cautiously with which class of medications?
- Antibiotics
- Anticoagulants and antiplatelet drugs (Correct answer)
- Antihistamines
- Thyroid medications
Correct answer: Anticoagulants and antiplatelet drugs
Ginkgo inhibits platelet-activating factor and has blood-thinning properties that can enhance the effects of anticoagulants, increasing bleeding risk.
Question 2: Which herb is known to potentially increase digoxin toxicity by altering potassium balance?
- Licorice root (Correct answer)
- Chamomile
- Lemon balm
- Red clover
Correct answer: Licorice root
Licorice can cause hypokalemia (low potassium) through mineralocorticoid-like effects, increasing the risk of digoxin toxicity since low potassium sensitizes the heart to digoxin.
Question 3: A patient on metformin for type 2 diabetes asks about taking berberine. The primary concern is:
- Reduced berberine absorption
- Additive blood glucose-lowering effect causing hypoglycemia (Correct answer)
- Increased metformin side effects from herbal interaction
- Berberine neutralizing metformin in the gut
Correct answer: Additive blood glucose-lowering effect causing hypoglycemia
Berberine activates AMPK and lowers blood glucose similarly to metformin; combining them may cause excessive glucose lowering and hypoglycemia.
Question 4: Valerian root combined with pharmaceutical sleep aids or sedatives raises concern mainly because of:
- Valerian reversing sedation
- Additive sedation leading to excessive CNS depression (Correct answer)
- Valerian inducing drug-metabolizing enzymes
- Increased heart rate from the combination
Correct answer: Additive sedation leading to excessive CNS depression
Valerian's sedative constituents (valerenic acid, GABA-ergic effects) add to those of prescription sedatives, potentially causing excessive sedation or respiratory depression.
Question 5: Echinacea may theoretically reduce the effectiveness of which drug category based on its immune-stimulating properties?
- Antibiotics
- Antifungals
- Immunosuppressants (Correct answer)
- Antihistamines
Correct answer: Immunosuppressants
Echinacea's immune-stimulating effects could potentially antagonize drugs meant to suppress immune function, such as those used after organ transplant.
Question 6: Which herb is most associated with serotonin syndrome risk when combined with SSRIs?
- Ashwagandha
- St. John's Wort (Correct answer)
- Hawthorn
- Holy basil
Correct answer: St. John's Wort
St. John's Wort inhibits reuptake of serotonin, dopamine, and norepinephrine; combining it with SSRIs may cause serotonin syndrome.
Herbalism Herb-Drug Interactions 2
Ginkgo biloba should be used cautiously with which class of medications?