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Signs and Symptoms
Serious overdose with morphine is characterized by respiratory depression (a decrease in respiratory rate and/or tidal volume, Cheyne-Stokes respiration, cyanosis), extreme somnolence progressing to stupor or coma, skeletal muscle flaccidity, cold or clammy skin, and sometimes bradycardia and hypotension. In severe overdosage, apnea, circulatory collapse, cardiac arrest and death may occur.
In all cases of suspected overdosage, call 800-222-1222 to obtain the most up-to-date information about the treatment of overdose. By calling this number, you will be automatically connected to your local Poison Control Center.
Primary attention should be given to the re-establishment of adequate respiratory exchange through provision of a patent airway and the institution of assisted or controlled ventilation. The narcotic antagonist naloxone is a specific antidote against respiratory depression which may result from overdosage or unusual sensitivity to narcotics, including morphine. Therefore, an appropriate dose of naloxone (usual initial adult dose: 0.4 mg) should be administered, prefer-ably by the intravenous route and simultaneously with efforts at respiratory resuscitation. Since the duration of action of morphine may exceed that of the antagonist, the patient should be kept under continued surveillance and repeated doses of the antagonist should be administered as needed to maintain adequate respiration.
An antagonist should not be administered in the absence of clinically significant respiratory or cardio-vascular depression.
Oxygen, intravenous fluids, vasopressors and other supportive measures should be employed as indicated.
Gastric emptying may be useful in removing unabsorbed drug.
Hypersensitivity to morphine; respiratory insufficiency or depression; severe CNS depression;attack of bronchial asthma; heart failure secondary to chronic lung disease;cardiac arrhythmias;increased intracranial or cerebrospinal pressure;head injuries;brain tumor; acute alcoholism; delirium tremens; convulsive disorders; after biliary tract surgery; suspected surgical abdomen; surgical anastomosis; concomitantly with MAO inhibitors or within 14 days of such treatment.This monograph has been modified to include the generic and brand name in many instances.
Last reviewed on RxList: 8/22/2007
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