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Special Precautions & Warnings:Pregnancy and breast-feeding: There is not enough reliable information about the safety of taking birch if you are pregnant or breast-feeding. Stay on the safe side and avoid use.
Allergy to wild carrot, mugwort, celery, and other spices: Birch pollen might cause allergies in people who are sensitive to wild carrot, mugwort, and celery. This has been called the "celery-carrot-mugwort-spice syndrome." Birch pollen might also cause allergies in people who are sensitive to certain other plants, including apples, soybeans, hazelnuts, and peanuts.
High blood pressure: There is some concern that birch leaf might increase the amount of salt (sodium) that the body retains, and this can make high blood pressure worse.
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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.