What are the side effects of glucosamine?

What are the possible side effects of glucosamine ()? Although uncommon, allergic reactions to glucosamine have been reported. Stop taking glucosamine and seek emergency medical attention if you experience symptoms of a serious allergic reaction including difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives.Other less serious side effects of glucosamine have not been reported. Talk to your doctor, pharmacist, or health care professional if you experience any side effects from glucosamine. You may report side effects to FDA at 1-800-FDA-1088.