Lungs

• According to Drugs.com, Telazol may depress respiration so that animals don't get enough oxygen, and cats may develop respiratory distress because of pulmonary edema (fluid in their lungs).
  
  

Heart

• In rare cases, Telazol may cause cardiac arrest. Dogs particularly may develop a rapid heart rate from Telazol and either an increase or a drop in blood pressure.
  
  

Muscles/Nerves

• Some animals may develop muscle twitching or muscle rigidity during administration of Telazol while others may develop convulsions from the effects on the central nervous system.
  
  

Mouth/Throat

• Animals may develop excessive salivation and mucus in the throat and may vomit during administration, putting the animals at risk for aspiration and choking.
  
  

Precautions

• Telazol is excreted almost exclusively through the kidneys, so animals with kidney disease should not receive Telazol, nor should animals with pancreatic, heart or lung disease as Telazol may cause death.
  
  

Warning

• Older animals may need reduced dosage, and Telazol is not safe for pregnant animals.