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In page Laudanum:

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Life-threatening overdose of opium tincture owes to the preparation's morphine content. Morphine produces a dose-dependent depressive effect on the respiratory system, which can lead to profound respiratory depression, hypoxia, coma and finally respiratory arrest and death. If overdose of opium tincture is suspected, rapid professional intervention is required. The primary concern is re-establishing a viable airway and institution of assisted or controlled ventilation if the patient is unable to breathe on their own. Other supportive measures such as the use of vasopressors and oxygen may be indicated to treat cardiac and/or pulmonary failure. Cardiac arrhythmias or arrest will require advanced life-saving measures.[citation needed]