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Allergic Reactions

True allergic reactions and systemic anaphylactoid reactions to opioids are rare. More commonly, local reactions caused by preservatives or histamine may occur. Wheal and flare responses on intradermal injection of morphine, meperidine, fentanyl, and sufentanil, but not alfentanil, naloxone, and nalbuphine, were greater than those due to saline.[286]

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