In agreement with the above posters, you can, and probably should, restrain them (with soft restraints or the minimum amount necessary for safety) prior to giving the Narcan. Having had the above situation happen to me several times...you learn quickly. And you're right- your safety, as well as the safety of your patient, is your primary concern.
Give that narcan slowly, and stay away from swinging arms, legs, and TEETH. Stupid people do crazy things coming out of their "high".
Have a great day.
vamedic4