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When taken by mouth: Onion is LIKELY SAFE when taken by mouth in amounts commonly found in food. Onion extract is POSSIBLY SAFE for most people when taken by mouth as a medicine. Daily doses of up to 900 mg of onion extract have been safely used for 12 weeks. Side effects might include stomach distress or pain after eating onion.
When applied to the skin: Onion extract is LIKELY SAFE when applied to the skin. Side effects might include skin irritation or eczema following skin contact with onion.
Special Precautions & Warnings:
Pregnancy and breast-feeding: There isn't enough reliable information to know if onion is safe to use as medicine when pregnant or breast-feeding. Stay on the safe side and avoid using onion in amounts larger than usual food amounts.
Bleeding disorder: Onion might slow blood clotting. There is concern that onion might increase the risk of bleeding when taken as a medicine. Don't use medicinal amounts of onion or onion extract if you have a bleeding disorder.
Cross-allergens: People with allergies to mugwort and celery might also be allergic to onion. Don't use in medicinal amounts if you have these allergies.
Diabetes: Onion might lower blood sugar. If you have diabetes and use onion in medicinal amounts, check your blood sugar carefully.
Surgery to place a pouch near the anus (ileal pouch-anal anastomosis): People that have had surgery to place a pouch near the anus might find that onion increases feelings of gas. Don't eat large amounts of onion if you have had this surgery.
Indigestion: People that experience indigestion often find that eating onion increases symptoms. Don't eat large amounts of onion if it increases your symptoms.
Surgery: Onion might slow blood clotting and lower blood sugar. In theory, onion might increase the risk for bleeding or interfere with blood sugar control during and after surgical procedures. Stop using onion as a medicine at least 2 weeks before a scheduled surgery.
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