Naturally occurring opiate which acts on opiate receptors in the brain providing sedation and analgesia. Also has vasodilatory properties (caused by mast cell degranulation and histamine release) which increase peripheral venous capacity and decrease venous return to the heart. Reduces cardiac workload, myocardial oxygen demand and pulmonary venous congestion.
Indications
CP associated with ACS
Pulmonary edema, CHF
Pain management
Contraindications
Hypersensitivity
Undiagnosed head injury
Hypovolemia
Severe hypotension
Acute asthma
COPD
Respiratory depression
Precautions
Administer slowly and titrate to effect
Undiagnosed abdominal injury
Side Effects
Dizziness
N/V
Cramps
Blurred vision
AMS
Constricted pupils
Headache
Seizures
Drowsiness
Bradycardia
Respiratory depression
Syncope
Palpitations
Hypotension
Dry mouth
Interactions
Enhanced CNS depression with antihistamines, sedatives, barbituates, alcohol. TCAs and MAOIs may precipitate hypotension
Dosage and Route
Adult: 1-5 mg slow IV/IM q 5 mins up to 15 mg
Pediatric: 0.1 mg/kg IV may repeat once after 10 mins