A serious but uncommon complication of undiagnosed or partially treated hyperthyroidism is thyroid storm, which may occur in response to stress such as infection, birth, or surgery. A woman with this emergency disorder may have fever, restlessness, tachycardia, vomiting, hypotension, or stupor. Prompt treatment is essential; IV fluids and oxygen are administered along with high doses of PTU. After administration of PTU, iodide is given. Other medications include antipyretics, dexamethasone, and beta-blockers.