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Stanford study shows opiates' side effects rooted in patients' genetics
Date:6/20/2012

STANFORD, Calif. Genetics play a significant role in determining which patients will suffer the most from the disturbing side effects of opiates, commonly prescribed painkillers for severe to moderate pain, according to a new Stanford University School of Medicine study, which pinpoints nausea, slowed breathing and potential for addiction as heritable traits.

"One of the most hated side effects of these opiates, nausea, is strongly inherited," said Martin Angst, MD, professor of anesthesia and one of two principal investigators for the new study, which explores individual variations in the response to opiate use. The study will be published online June 20 in Anesthesiology. Genetics also play a likely role in determining which patients will suffer from itchiness and sedation associated with the use of these powerful medications, which include morphine, methadone and oxycodone.

"The study is a significant step forward in efforts to understand the basis of individual variability in response to opioids and to eventually personalize opioid treatment plans for patients," said Angst, director of the Stanford Human Pain Research Laboratory. "Our findings strongly encourage the use of downstream molecular genetics to identify patients who are more likely or less likely to benefit from these drugs to help make decisions on how aggressive you want to be with treatment, how carefully you monitor patients and whether certain patients are suitable candidates for prolonged treatment."

Treatment with opiates, also known as narcotics, is tricky because of this variability in drug response. Certain patients may require 10 times the amount of these painkillers to get the same level of pain relief as others. In fact, in some patients the occurrence of side effects may prevent the use of opioids for effectively alleviating pain. Side effects such as nausea or sedation can be debilitating to some, while nonexistent for others. Similarly, some p
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Contact: Ruthann Richter
richter1@stanford.edu
650-725-8047
Stanford University Medical Center
Source:Eurekalert

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