It is difficult to answer this question. N has not been used recently for induction of anesthesia. Just experimental. The anesthesia induction dose of thiopental is around 4mg/kg and it is common for the standard anesthesia induction dose to cause apnea. Barbiturate dosing is specific. Of course N and thiopental are different. If 600 mg of thiopental were injected quickly, without a healthcare professional to manage the airway, it would probably kill most average people. Same for propofol. Some parameters are important.
- Age
- Weight
- Drug addiction
- Chronic disease in the cardiovascular system.
If 600 mg N is injected rapidly, it will not only cause a rapid onset of apnea but also have hemodynamic effects. Bradycardia and hypotension, perhaps even circulatory collapse depending on the above parameters. The answer to the question is specific. Still fatal to most average people. Although it alone does not inhibit breathing long enough for asphyxia, the risk of airway collapse is there.