What are the side effects of lysine?

What are the possible side effects of lysine ()? Stop taking lysine 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.Side effects other than those listed here may also occur. Talk to your doctor, pharmacist, or healthcare provider about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.