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itching, burning, swelling, scaling, broken skin, blisters, and scarring of the skin. Rarely, allergic reactions can occur such as hives, runny nose, wheezing, and asthma.
Henna is considered to be unsafe when taken by mouth. Accidentally swallowing henna requires prompt medical attention. It can cause stomach upset and other side effects.
Henna is considered unsafe for use in children, especially in infants. There have been cases of serious side effects, including blood disorders, when henna was applied to the skin of infants.
Do not use henna if:
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.