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Understanding Anesthesiology - The Global Regional Anesthesia ...

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MORPHINE SULFATE<br />

Class<br />

Opioid analgesic (long acting). In anesthetic practice,<br />

its main use is for postoperative analgesia. Morphine is<br />

commonly used intravenously and for spinal or<br />

epidural anesthesia/analgesia.<br />

Mechanism of Action<br />

Active at the mu and kappa opioid receptors.<br />

Dose<br />

Adults: 2.5-15 mg IV/IM/SC<br />

Children: 0.05-0.2 mg/kg IV/IM/SC<br />

Onset<br />

IV 5-10 minutes<br />

Effects<br />

CNS<br />

Reliable analgesic effects; sedation. May cause blurred<br />

vision, syncope, euphoria, dysphoria. All of the depressant<br />

effects of morphine are potentiated by concurrent<br />

use of sedatives, volatile anesthetics, nitrous oxide and<br />

alcohol. Morphine’s depressant effects are also potentiated<br />

by antihistamines, phenothiazines, butyrophenones,<br />

MAOIs and TCAs.<br />

CVS<br />

May cause hypotension, hypertension, bradycardia, arrhythmias.<br />

Respiratory<br />

Respiratory depression which at the extreme leads to<br />

apnea. May cause bronchospasm or laryngospasm.<br />

GI<br />

Nausea, vomiting, constipation, biliary tract spasm.<br />

Misc.<br />

Releases histamine. May cause pruritis, urticaria, muscle<br />

rigidity, urinary retention.<br />

IM 15-30 minutes<br />

Duration<br />

2-5 hrs IV/IM/SC<br />

Elimination<br />

Hepatic<br />

108

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