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:

Less common

  1. Chest pain
  2. confusion about identity, place, and time
  3. discouragement
  4. false or unusual sense of well-being
  5. fast, irregular, pounding, or racing heartbeat or pulse
  6. feeling sad or empty
  7. fever
  8. general feeling of discomfort or illness
  9. irritability
  10. lack of appetite
  11. lightheadedness
  12. loss of interest or pleasure
  13. shakiness and unsteady walk
  14. tiredness
  15. trouble concentrating
  16. trouble sleeping
  17. unsteadiness, trembling, or other problems with muscle control or coordination
  18. unusual tiredness or weakness


  1. Anxiety
  2. attack, assault, or force
  3. black, tarry stools
  4. bladder pain
  5. bloody or cloudy urine
  6. burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
  7. change in walking and balance
  8. chills
  9. cold sweats
  10. cough
  11. crying
  12. decreased awareness or responsiveness
  13. deep or fast breathing with dizziness
  14. delusions of persecution, mistrust, suspiciousness, or combativeness
  15. difficult, burning, or painful urination
  16. difficulty with swallowing
  17. dizziness
  18. dizziness, faintness, or lightheadedness when getting up from lying or sitting position
  19. dry mouth
  20. fainting
  21. false beliefs that cannot be changed by facts
  22. feeling of unreality
  23. fever
  24. frequent urge to urinate
  25. hives, itching, or skin rash
  26. irregular heartbeat
  27. irritability
  28. lack of feeling or emotion
  29. light-colored stools
  30. lower back or side pain
  31. nausea
  32. numbness of the feet, hands, and around the mouth
  33. pale skin
  34. poor insight and judgment
  35. problems with memory or speech
  36. puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
  37. quick to react or overreact emotionally
  38. rapidly changing moods
  39. restlessness
  40. seeing, hearing, or feeling things that are not there
  41. sense of detachment from self or body
  42. severe sleepiness
  43. sore throat
  44. sores, ulcers, or white spots on the lips or in the mouth
  45. stomach pain
  46. swollen glands
  47. thoughts of killing oneself or changes in behavior
  48. tightness in the chest
  49. trouble recognizing objects
  50. trouble thinking and planning
  51. trouble walking
  52. troubled breathing with exertion
  53. uncaring
  54. unusual bleeding or bruising
  55. vomiting
  56. yellow eyes or skin
  57. unease or dissatisfaction with life

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

Symptoms of overdose

  1. Change or loss of consciousness
  2. difficult or troubled breathing
  3. irregular, fast or slow, or shallow breathing
  4. pale or blue lips, fingernails, or skin
  5. sleepiness or unusual drowsiness

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. Drowsiness
  2. headache
  3. muscle aches
  4. sleepiness or unusual drowsiness
  5. stuffy or runny nose

Less common

  1. Back pain
  2. being forgetful
  3. belching
  4. body aches or pain
  5. congestion
  6. diarrhea
  7. difficulty having a bowel movement
  8. difficulty with moving
  9. double vision
  10. feeling of constant movement of self or surroundings
  11. heartburn
  12. hoarseness
  13. indigestion
  14. longer or heavier menstrual periods
  15. loss of memory
  16. muscle pain or stiffness
  17. pain or tenderness around the eyes and cheekbones
  18. seeing double
  19. sensation of spinning
  20. stomach discomfort
  21. tender, swollen glands in the neck
  22. unusual drowsiness, dullness, tiredness, weakness, or feeling of sluggishness
  23. voice changes


  1. Bad, unusual, or unpleasant (after) taste
  2. blemishes on the skin
  3. blindness
  4. blurred vision
  5. breast pain
  6. change in near or distance vision
  7. change in taste
  8. changes in patterns and rhythms of speech
  9. decreased interest in sexual intercourse
  10. difficulty in focusing the eyes
  11. eye pain
  12. feeling of warmth
  13. frequent urge to defecate
  14. inability to have or keep an erection
  15. increased appetite
  16. increased sensitivity of the skin to sunlight
  17. increased sweating
  18. itching of the vagina or genital area
  19. lack or loss of strength
  20. loss in sexual ability, desire, drive, or performance
  21. pain during sexual intercourse
  22. paleness of the skin
  23. pimples
  24. redness of the face, neck, arms, and occasionally, upper chest
  25. redness or other discoloration of the skin
  26. severe sunburn
  27. slurred speech
  28. stomach upset
  29. straining while passing stool
  30. tearing
  31. thick, white vaginal discharge with no odor or with a mild odor
  32. 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.