Final answer:
The Narcan nozzle should be inserted into someone's nose until it reaches the back of their nasal passage, about 1/2 to 1 inch deep.
Step-by-step explanation:
The Narcan nozzle should be inserted into someone's nose until it reaches the back of their nasal passage. Typically, it needs to go in about 1/2 to 1 inch deep, aiming towards the septum (the wall of tissue between the nostrils). It's important to make sure the nozzle is inserted properly to ensure the medication is delivered effectively.