<prompt> Morphine when used for cancer palliative therapy least likely to cause:Nausea vomitingConstipationDry mouthRespiratory depression  <response>: Ans: c Dry monthRef: Tripathi 6th ed., Pg. 456Dry mouth has not been mentioned as an adverse effect of morphine. Other three choices are obvious.MorphineIt is a full agonist of mu receptors.Adverse effectsSedationLethargyVomitingConstipationRespiratory depressionAllergyWithdrawal features:1 Intense craving2 Restlessness and insomnia3 Pain in muscle and joints4 Running nose and eyes5 Abdominal cramps, vomiting, diarrhoeab Piloerection, sweating, dilated pupils, tachycardia7 Disturbance of temperature control Antidote for morphine poisoning - naloxone 