Drugs

Morphine sulfate 1mg/ml - 50mg/ml Injectable Ampoule

Morphine sulfate (Injectable Ampoule)

Presentation

 

 VolumeDosage 
  1 ml 1 mg
 10 ml 500 mg

 

Pharmacodynamics
Opioid analgesic (code ATC : N02AA01; N: central nervous system)

 

Action on central nervous system :
Morphine has a dose-dependent analgesic action. It may act on psychomotor behavior and cause, depending on the dose and background, either sedation or agitation. On respiratory centers and that of cough, morphine exerts from the onset of therapeutic doses, a depressive action. The depressor respiratory effects of morphine subside in chronic treatment. Action of morphine on the vomiting center, (via the chemoreceptor trigger zone (CTZ), particularly through stimulation by pain and cochleo-vestibular space), and on gastric emptying endows it with variable emetic properties. Finally morphine results in myosis from central nervous system.

 

Action on the smooth muscle :
Morphine decreases tonicity and peristalsis of longitudinal fibres while increasing tonicity of circular fibres, causing spasm on sphincters (pylorus, ileum-caecal valvula, anal sphincter, Oddi's sphincter, vesical sphincter).

 

Pharmacokinetics
Resorption :

  • Since it is more quickly resorbed in blood by epidural route (via large venous plexus) than by intrathecal (via small medullary capillaries), morphine-induced analgesia has a sustained release action by intrathecal route.
  • By epidural and intrathecal route, supraspinal distribution is delayed.
  • Biodisponibility of oral administration compared to those administered by subcutaneous route is 50 %.
  • Biodisponibility of oral administration compared to that administered by intravenous route accounts for 30 %.

 

Distribution :
After resorption, the binding of morphine to plasma proteins accounts for 30 %. Morphine crosses the hematoencephalic barrier and placenta.

 

Metabolism :
Morphine is highly metabolized in glucuronoconjugated derivatives which go through an enterohepatic cycle. 6 -glucuronide and normorphine are two active metabolites of the substance-mother.

 

Elimination :

  • Plasma half-life of morphine varies (from 2 to 6 hours).
  • Elimination of glucuronoconjugated derivatives is primarily through urine, both by glomerular filtration and tubular secretion. Elimination in the feces is low (<10 %).

 

Therapeutic Indications of morphine sulfate 
Intense pains and/or not responsive to non-opioid analgesics.

 

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