Side Effects

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. Cough
  2. difficulty with speaking
  3. drooling
  4. fear or nervousness
  5. fever
  6. inability to sit still
  7. loss of balance control
  8. muscle trembling, jerking, or stiffness
  9. need to keep moving
  10. restlessness
  11. shuffling walk
  12. sneezing
  13. sore throat
  14. stiffness of the limbs
  15. twisting movements of the body
  16. uncontrolled movements, especially of the face, neck, and back

Less common

  1. Blurred vision
  2. body aches or pain
  3. chest pain
  4. congestion
  5. dizziness
  6. fast, pounding, or irregular heartbeat or pulse
  7. headache
  8. hoarseness
  9. pounding in the ears
  10. runny nose
  11. slow or fast heartbeat
  12. swelling of the tongue
  13. tender, swollen glands in the neck
  14. trouble with swallowing
  15. voice changes


  1. Dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
  2. persistent, painful erection
  3. seizures

Incidence not known

  1. Inability to move the eyes
  2. increased blinking or spasms of the eyelid
  3. sticking out of tongue
  4. trouble with breathing
  5. uncontrolled twisting movements of the neck, trunk, arms, or legs
  6. unusual facial expressions

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:

More common

  1. Acid or sour stomach
  2. belching
  3. constipation
  4. diarrhea
  5. heartburn
  6. indigestion
  7. lack or loss of strength
  8. nausea
  9. rash
  10. stomach discomfort, upset, or pain
  11. weakness
  12. weight gain

Less common

  1. Blistering, crusting, irritation, itching, or reddening of the skin
  2. burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
  3. change in vision
  4. cracked, dry, or scaly skin
  5. depression
  6. difficulty with moving
  7. dry mouth
  8. increase in salivation
  9. itching or reddening of the skin
  10. joint pain
  11. loss of appetite
  12. muscle ache
  13. muscle pains or stiffness
  14. muscle tightness
  15. stuffy nose
  16. swelling
  17. swollen joints
  18. vomiting
  19. weakness of the arms and legs
  20. weight 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.