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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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Tolerance develops to all of the following actions of opioids except?
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The correct answer is  Repeated administration of morphine results in the development of tolerance to some of its effects including respiratory depression,analgesia, sedation and euphoriant effects and other CNS depressant effects. Constipation and miosis shows no tolerance Ref: KD Tripathi 8th ed.