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. Twitching, twisting, uncontrolled repetitive movements of the tongue, lips, face, arms, or legs

Less common

  1. Blurred vision
  2. bruising
  3. chest pain
  4. convulsions
  5. decreased urine
  6. difficult or labored breathing
  7. difficulty with swallowing
  8. discouragement
  9. dizziness
  10. dry mouth
  11. feeling sad or empty
  12. headache
  13. increased thirst
  14. irregular heartbeat
  15. irritability
  16. large, flat, blue or purplish patches in the skin
  17. loss of appetite
  18. loss of interest or pleasure
  19. mood changes
  20. muscle pain or cramps
  21. nausea or vomiting
  22. nervousness
  23. numbness or tingling in the hands, feet, or lips
  24. pounding in the ears
  25. seeing, hearing, or feeling things that are not there
  26. shakiness and unsteady walk
  27. shakiness in the legs, arms, hands, or feet
  28. sleepiness or unusual drowsiness
  29. slow or fast heartbeat
  30. swelling or inflammation of the mouth
  31. tightness in the chest
  32. tiredness
  33. trouble concentrating
  34. trouble sleeping
  35. unsteadiness, trembling, or other problems with muscle control or coordination
  36. unusual tiredness or weakness

Incidence not known

  1. Agitation
  2. diarrhea
  3. dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
  4. fever
  5. overactive reflexes
  6. poor coordination
  7. restlessness
  8. shivering
  9. sweating
  10. talking or acting with excitement you cannot control

Get emergency help immediately if any of the following symptoms of overdose occur:

Symptoms of overdose

  1. Agitation
  2. chest pain
  3. difficulty opening the mouth or lockjaw
  4. dizziness (severe) or fainting
  5. fast or irregular pulse (continuing)
  6. high fever
  7. high or low blood pressure
  8. severe spasm where the head and heels are bent backward and the body arched forward
  9. troubled breathing

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. Dry skin
  2. hives, itching, or skin rash
  3. itching, scaling, severe redness, soreness, or swelling of the skin
  4. runny nose
  5. sneezing
  6. stuffy nose
  7. trouble sleeping

Less common

  1. Acid or sour stomach
  2. back pain
  3. belching
  4. bloated or full feeling
  5. body aches or pain
  6. congestion
  7. cough
  8. difficulty having a bowel movement (stool)
  9. difficulty with moving
  10. dryness or soreness of the throat
  11. excess air or gas in the stomach or intestines
  12. heartburn
  13. hoarseness
  14. indigestion
  15. joint pain
  16. leg cramps
  17. muscle aching or cramping
  18. muscle pains or stiffness
  19. passing gas
  20. stomach discomfort, upset, or pain
  21. swollen joints
  22. tender, swollen glands in the neck
  23. tooth problems
  24. voice changes

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.