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. Bladder pain
  2. bloody or cloudy urine
  3. difficult, burning, or painful urination
  4. fast, pounding, or irregular heartbeat or pulse
  5. frequent urge to urinate
  6. lower back or side pain

Less common

  1. Chills
  2. cough
  3. diarrhea
  4. fever
  5. general feeling of discomfort or illness
  6. headache
  7. hoarseness
  8. joint pain
  9. loss of appetite
  10. muscle aches and pains
  11. nausea
  12. runny nose
  13. shivering
  14. sore throat
  15. sweating
  16. trouble sleeping
  17. unusual tiredness or weakness
  18. vomiting

Incidence not known

  1. Blistering, peeling, or loosening of the skin
  2. chest pain or discomfort
  3. confusion
  4. dark urine
  5. difficulty breathing
  6. difficulty with speaking
  7. difficulty with swallowing
  8. dizziness
  9. double vision
  10. faintness
  11. inability to move the arms, legs, or facial muscles
  12. inability to speak
  13. itching, skin rash
  14. large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or genitals
  15. loss of bladder control
  16. muscle cramps or stiffness
  17. muscle spasm or jerking of the arms and legs
  18. pain or discomfort in the arms, jaw, back, or neck
  19. red skin lesions, often with a purple center
  20. red, irritated eyes
  21. seeing, hearing, or feeling things that are not there
  22. seizures
  23. slow speech
  24. sores, ulcers, or white spots in the mouth or on the lips
  25. sudden loss of consciousness
  26. swelling of the feet or lower legs
  27. tightness in the chest
  28. uncontrolled repeated movements (tics)
  29. uncontrolled vocal outbursts
  30. unusual tiredness or weakness

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. Anxiety
  2. dry mouth
  3. lack or loss of strength
  4. stomach pain
  5. weight loss

Incidence not known

  1. Constipation
  2. decreased interest in sexual intercourse
  3. false or unusual sense of well-being
  4. inability to have or keep an erection
  5. loss in sexual ability, desire, drive, or performance
  6. twitching, twisting, uncontrolled repetitive movements of the tongue, lips, face, arms, or legs

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.

Portions of this document last updated: Aug. 01, 2019

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