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. blurred vision
  4. body aches or pain
  5. burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
  6. confusion
  7. difficult, burning, or painful urination
  8. dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
  9. excessive muscle tone
  10. fear or nervousness
  11. feeling sad or empty
  12. fever
  13. hearing changes
  14. hives or welts, skin rash
  15. irritability
  16. lower back or side pain
  17. muscle stiffness, tension, or tightness
  18. poor concentration
  19. rhythmic movement of muscles
  20. sneezing
  21. tightness of the chest
  22. trouble breathing
  23. unusual tiredness or weakness
  24. voice changes

Less common

  1. Anger that is hard to control
  2. anxiety
  3. breast enlargement
  4. changes in vision
  5. chest pain or discomfort
  6. chills
  7. decrease in the frequency of urination
  8. deep or fast breathing with dizziness
  9. difficulty in speaking
  10. dry mouth
  11. fast, irregular, pounding, or racing heartbeat or pulse
  12. headache, severe and throbbing
  13. nausea
  14. numbness of the feet, hands, and around the mouth
  15. numbness, tingling, pain, or weakness in the hands or feet
  16. pain during sexual intercourse
  17. paranoia
  18. rapidly changing moods
  19. restlessness
  20. shaking
  21. sores, ulcers, or white spots on the lips or tongue or inside the mouth
  22. sweating
  23. swelling of the face, fingers, feet, or lower legs
  24. vomiting

Incidence not known

  1. Agitation
  2. blindness
  3. cough
  4. decreased awareness or responsiveness
  5. depression
  6. dizziness
  7. eye pain
  8. hostility
  9. increased thirst
  10. loss of consciousness
  11. muscle pain, cramps, or twitching
  12. rapid weight gain
  13. seizures
  14. severe sleepiness
  15. sore throat
  16. swollen, painful, or tender lymph glands in the neck, armpit, or groin
  17. tearing
  18. unusual drowsiness, dullness, or feeling of sluggishness
  19. yellow skin or eyes

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. Blistering, crusting, irritation, itching, or reddening of the skin
  2. change in taste
  3. constipation
  4. cracked, dry, or scaly skin
  5. change in interest in sexual intercourse
  6. diarrhea
  7. dry skin
  8. heartburn
  9. inability to have or keep an erection
  10. increased interest in sexual intercourse
  11. joint pain or swelling
  12. pimples
  13. redness of the face, neck, arms, and occasionally, upper chest
  14. shakiness in the legs, arms, hands, or feet
  15. stomach discomfort, upset, or pain
  16. swelling
  17. trembling or shaking of the hands or feet

Less common

  1. Absent, missed, or irregular menstrual periods
  2. breast pain

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.