Drug allergies can trigger many symptoms generally associated with allergic reactions. Some of these symptoms include:

• Hives. Red, swollen patches of skin that occur in groups and may burn, sting or itch.
  

  

• Skin rashes. Any change to the color and/or texture of the skin.
  
  
• Wheezing. A whistling or high-pitched sound caused by breathing when the breathing tubes are narrowed.
  
  
• Anaphylaxis. An allergic reaction involving two or more body systems that can lead to the severe and possibly life-threatening anaphylactic shock.

Other disorders which can be triggered by drug allergies include:

• Lupus, an autoimmune disorder (a disorder that is the result of the immune system reacting against the body's own cells)
  
  
• Vasculitis, an inflammation of blood vessels
  
  
• Myasthenia gravis, an autoimmune disorder