Patients are urged to tell their physician if they have been diagnosed with any medical condition. These include any allergies, especially if they have ever experienced an allergic reaction to previous use of the dopamine precursor levodopa (also called L-Dopa) or an allergic reaction to other substances such as foods, preservatives or dyes.

Other conditions of concern with regard to using dopamine precursors include:

• Blood vessel disease
  
  
• Diabetes
  
  
• Glaucoma
  
  
• Heart conditions or history of heart attacks
  
  
• Hormone problems
  
  
• Kidney or liver disease
  
  
• Lung disease (e.g., asthma, emphysema, bronchitis)
  
  
• Melanoma
  
  
• Mental illness
  
  
• Seizure disorders
  

  

• Skin cancer
  
  
• Stomach ulcers