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Experimental drug more potent, longer lasting than morphine
Date:1/4/2011

MAYWOOD, Ill. -- A little-known morphinelike drug is potentially more potent, longer lasting and less likely to cause constipation than standard morphine, a study led by a Loyola University Health System anesthesiologist has found.

The drug, morphine-6-0-sulfate, has a similar chemical structure to standard morphine. Dr. Joseph Holtman Jr. and colleagues reported that a study they performed in rats "demonstrated potential clinical advantages of morphine-6-0-sulfate compared to morphine."

Holtman is first author of the study, published in the December 2010 issue of the European Journal of Pharmacology.

Holtman is medical director of Loyola's Pain Specialty Service and a professor in the departments of Anesthesiology and Molecular Pharmacology and Therapeutics of Loyola University Chicago Stritch School of Medicine. He directed the study while he was at the University of Kentucky's College of Medicine. He joined Loyola on March 1, 2010.

Opioids, such as morphine, oxycodone and hydrocodone, are standard drugs for treating moderate to severe pain, including cancer pain. But these drugs can have significant side effects, including constipation, nausea, vomiting, drowsiness, cognitive dysfunction and slowed breathing and heart rates. And while opioids work well for conditions such as back pain and post-operative pain, the drugs are less effective against neuropathic pain, such as tingling, burning or shooting pain.

Constipation is a common side effect of morphine and can be so uncomfortable that some patients limit their use of the drug. Doctors typically do not discharge surgery patients until they have had a bowel movement and this can extend hospital stays.

Holtman and colleagues tested standard morphine and morphine-6-0-sulfate on rats. The animals received the drugs three ways -- by mouth, by IV and by injection into the space surrounding the spinal cord.

The rats underwent several well-estab
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Contact: Jim Ritter
jritter@lumc.edu
708-216-2445
Loyola University Health System
Source:Eurekalert

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