See a medical doctor. Rapid support of respiration and circulation is essential to successful treatment of cyanide intoxication. Amyl nitrite and oxygen use is noted below. Check methemoglobin levels. Hemodialysis and hemoperfusion are not effective.
Hyperbaric oxygen is unproven.
Amyl nitrite and oxygen are effective and is the only treatment necessary in most cases. The objective is to get amyl nitrite vapors into the lungs. Rescuers may get dizzy if too much amyl nitrite is breathed. If not alert, follow 'unconscious but breathing' below. Use a fresh ampule every 3 minutes.