Side Effects

Drug information provided by: Merative, Micromedex®

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

More common

  1. Blurred vision
  2. chest pain or discomfort
  3. difficulty in speaking
  4. dizziness or lightheadedness, especially when getting up suddenly from a lying or sitting position
  5. double vision
  6. feeling, seeing, or hearing things that are not there
  7. feeling of constant movement of self or surroundings
  8. feeling that others are watching you or controlling your behavior
  9. feeling that others can hear your thoughts
  10. headache
  11. inability to move the arms, legs, or facial muscles
  12. inability to speak
  13. lack or loss of strength
  14. nausea
  15. nervousness
  16. pain or discomfort in the arms, jaw, back, or neck
  17. pounding in the ears
  18. sensation of spinning
  19. severe mood or mental changes
  20. shakiness and unsteady walk
  21. slow or fast heartbeat
  22. slow speech
  23. sweating
  24. trouble breathing
  25. trouble sleeping
  26. unsteadiness, trembling, or other problems with muscle control or coordination
  27. unusual behavior
  28. vomiting

Less common—reported more often in patients with Parkinson's disease

  1. Confusion
  2. uncontrolled movements of the body, such as the face, tongue, arms, hands, head, and upper body

Rare—reported more often in patients taking large doses

  1. Increased frequency of urination
  2. loss of appetite, continuing
  3. lower back pain
  4. runny nose, continuing
  5. stomach pain, continuing or severe
  6. weakness


  1. Black, tarry stools
  2. bloody vomit
  3. fainting
  4. nausea
  5. nervousness
  6. seizures
  7. sudden weakness
  8. temporary blindness
  9. unusual headache
  10. vomiting, continuing or severe

Incidence not known

  1. Agitation
  2. anxiety
  3. blue or pale skin
  4. chest pain, possibly moving to the left arm, neck, or shoulder
  5. chills
  6. constipation
  7. continuing ringing or buzzing or other unexplained noise in the ears
  8. cough
  9. diarrhea
  10. difficulty in speaking
  11. double vision
  12. false beliefs that cannot be changed by facts
  13. fever
  14. headache
  15. hearing loss
  16. heartburn
  17. high fever
  18. high or low blood pressure
  19. inability to move the arms, legs, or facial muscles
  20. inability to speak
  21. increased in sexual ability, desire, drive, or performance
  22. increased interest in sexual intercourse
  23. increased frequency of urination
  24. indigestion
  25. loss of bladder control
  26. lower back pain
  27. severe muscle stiffness
  28. stuffy nose
  29. unusual tiredness or weakness
  30. unusually pale skin
  31. vomiting of blood or material that looks like coffee grounds

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Less common

  1. Drowsiness
  2. dry mouth
  3. leg cramps at night
  4. loss of appetite
  5. mental depression
  6. stomach pain
  7. tingling or pain in the fingers and toes when exposed to cold temperatures

Incidence not known

  1. Hair loss

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.