<p>All medicines may cause side effects, but many people have no, or minor, side effects. When used in small doses, no common side effects have been reported with this product. Seek medical attention right away if any of these severe side effects occur: Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); eye swelling or redness.</p>