Overview
Herbal medicines are widely used across the world, often perceived as “natural” and therefore safe. However, many herbal products are unregulated, which means they may not be tested for safety, purity, or effectiveness. This can lead to serious health side effects and interactions with conventional medications.

Common Causes

• Lack of regulatory oversight in manufacturing and labeling
• Adulteration with prescription drugs, heavy metals, or steroids
• Inaccurate dosing or plant misidentification
• Misleading health claims without scientific evidence
• Self-medication without consulting a healthcare provider

Potential Side Effects

• Liver damage (e.g., with kava, comfrey, or green tea extract)
• Kidney failure (e.g., with aristolochic acid in some traditional Chinese herbs)
• Heart problems (e.g., with ephedra or bitter orange)
• Bleeding risks (e.g., ginkgo biloba or garlic with blood thinners)
• Allergic reactions (e.g., with echinacea or feverfew)
• Hormonal disruptions (e.g., with licorice or dong quai)
• Drug interactions (e.g., St. John’s Wort interfering with antidepressants, birth control, or HIV medications)

Diagnosis
Diagnosis of side effects from herbal medicines often involves:

• A thorough medical and supplement history
• Lab tests to check liver, kidney, or heart function
• Identifying and stopping the suspected herb
• Notifying poison control or pharmacovigilance centers if needed

Treatment

• Immediate discontinuation of the suspected herbal product
• Supportive care for organ-specific damage
• Managing complications such as bleeding, arrhythmias, or allergic reactions
• Hospitalization in severe cases

Prevention Tips

• Only use herbal supplements that are approved by recognized regulatory agencies
• Consult with a doctor before starting any herbal product
• Avoid combining herbal and prescription medications without supervision
• Be wary of exaggerated claims or “miracle cures”
• Report any side effects to your healthcare provider

Prognosis
Outcomes vary depending on the herb, dose, and duration of use. Some side effects may be reversible if caught early, but others—such as organ damage—can be long-term or life-threatening.

Support and Resources

• WHO Traditional Medicine Strategy
• National Center for Complementary and Integrative Health (NCCIH)
• Local poison control centers
• Pharmacovigilance programs and adverse event reporting systems