Types of Side Effects

• Possible side effects of L-Tyrosine include nausea, fatigue, headaches, heartburn, joint pain, mood changes, irritability and changes in heart rate.
  
  

Pediatrics

• L-Tyrosine may pose increased risks for side effects in infants and children, according to the Physicians Desktop Reference.
  
  

Drug Interactions

• L-Tyrosine decreases the effectiveness of the prescription medication of Levodopa, causing an increase of symptoms in patients with Parkinson's disease, according to RxList.com. Because L-Tyrosine causes a slight increase in the production of thyroid hormones, combining the drug with medications used to treat hypothryoidism may result in excessive production of thyroid hormones.
  
  

Risks

• Some patients develop a potentially life-threatening allergic reaction to L-Tyrosine, causing chest pain, shortness of breath and an itchy skin rash.
  
  

Considerations

• If you have a history of diabetes, hyperthyroidism or Grave's disease, you should not take L-Tyrosine due to its potential side effects. Women who are pregnant or nursing should not take L-Tyrosine, according to the Physician's Desktop Reference.