Cardiac Effects

• Uncommon cardiac effects associated with Norvasc include worsening chest pain and a heartbeat that is irregular, abnormally slow, fast or pounding.
  
  

Pregnancy Considerations

• Do not take Norvasc if you are pregnant or may become pregnant. Animal studies show that the drug can harm the fetus. Researchers have not yet determined if Norvasc affects a human fetus.
  
  

Liver Problems

• Norvasc can cause liver problems, with symptoms of jaundice or dark urine. You should not take Norvasc if you have any liver disorders, such as fatty liver disease or cirrhosis.
  
  

Sexual Dysfunction

• According to eMedTV, between 1 and 2 percent of men participating in Norvasc clinical studies reported sexual problems while taking the drug. Women also reported sexual problems, although less frequently.
  
  

Allergic Reaction

• You should not take Norvasc if you are allergic to any of the components used to make the drug. Obtain a list of all ingredients from your doctor or pharmacist.
  
  

Alcohol

• Although alcohol does not interact with Norvasc, it can further decrease blood pressure and may increase Norvasc's side effects, including dizziness, drowsiness, fatigue, weakness, flushing, nausea, stomach pain and headaches.