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Peppermint can cause some side effects including heartburn, and allergic reactions including flushing, headache, and mouth sores.
Peppermint oil, when taken by mouth in pills with a special (enteric) coating to prevent contact with the stomach, is POSSIBLY SAFE for children 8 years of age and older.
Special Precautions & Warnings:Pregnancy and breast-feeding: It is LIKELY SAFE to take peppermint in amounts normally found in food during pregnancy and breast-feeding. However, not enough is known about the safety of taking larger amounts used for medicine. It's best not to take these larger amounts if you are pregnant or breast-feeding.
A stomach condition in which the stomach is not producing hydrochloric acid (achlorhydria): Don't use enteric-coated peppermint oil if you have this condition. The enteric coating might dissolve too early in the digestive process.
Diarrhea: Enteric-coated peppermint oil could cause anal burning, if you have diarrhea.
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.