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This is a safe and effective sedative agent that is mixed with oxygen and inhaled through a small mask that fits over your nose to help you relax. It is not intended to put you to sleep, you will be able to hear and respond to any requests the clinical team is asking. You will be asked to breathe normally through your nose, and within a few minutes you should start to feel the effects. You may feel light-headed or a tingling in your arms and legs. Ultimately, you should feel calm and comfortable. The effects of nitrous oxide wear off soon after the mask is removed.