Certain medical conditions may increase the likelihood of experiencing side effects associated with skeletal muscle relaxants. Patients are urged to tell their physician if they have any allergies, especially if they have ever experienced an allergic reaction to any muscle relaxant or to other substances such as foods, preservatives or dyes.

Other conditions that should be disclosed to a physician include:

• Blood disease resulting from allergies or reaction to medicine
  
  
• Epilepsy
  
  
• History of drug dependency
  
  
• Kidney disease
  
  
• Liver disease
  
  
• Porphyria (disease that causes accumulation of chemicals called porphyrins or porphyrin precursors)