Inhalation of high concentrations of vapor may cause central nervous system effects such as dizziness,
drowsiness, anesthesia, or unconsciousness. Anesthetic effects may occur at concentrations of 5000 ppm v/v or
above. At concentrations of 20,000 ppm or higher, HCFC-123 may causes increased sensitivity of the heart to
adrenaline which might cause irregular heart beats and possible ventricular fibrillation or death. Long-term exposure
to concentrations above those time weighted averages recommended may cause liver damage with altered enzyme
levels and central nervous system depression. When used on a fire, hazardous decomposition products are formed,
but typically are within safe emergency exposure limits.