Codeine (Oral Route) Precautions - Mayo Clinic
https://www.mayoclinic.org/drugs-supplements/codeine-oral-route/precautions/drg-20074022
WEBCheck with your doctor right away if you have anxiety, restlessness, a fast heartbeat, fever, sweating, muscle spasms, twitching, nausea, vomiting, diarrhea, or see or hear things that are not there. These may be symptoms of a serious condition called serotonin syndrome.
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