Side Effects

Drug information provided by: Micromedex

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. Blurred vision
  2. confusion
  3. dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
  4. fainting
  5. fast, pounding, or irregular heartbeat or pulse
  6. fever
  7. shakiness in the legs, arms, hands, or feet
  8. sleepiness or unusual drowsiness
  9. sweating
  10. trembling or shaking of the hands or feet
  11. unusual tiredness or weakness

Less common

  1. Anxiety
  2. black, tarry stools
  3. chest pain
  4. chills
  5. convulsions
  6. cough or hoarseness
  7. decrease in the frequency of urination
  8. decrease in urine volume
  9. difficult or labored breathing
  10. difficulty in passing urine (dribbling)
  11. discouragement
  12. dry mouth
  13. feeling sad or empty
  14. fever with or without chills
  15. frequent strong or increased urge to urinate
  16. general feeling of tiredness or weakness
  17. headache
  18. hyperventilation
  19. irritability
  20. lack of appetite
  21. loss of bladder control
  22. loss of interest or pleasure
  23. lower back or side pain
  24. muscle spasm or jerking of the arms or legs
  25. painful or difficult urination
  26. pounding in the ears
  27. restlessness or need to keep moving
  28. severe or continuing headache
  29. shakiness and unsteady walk
  30. slurred speech
  31. sore throat
  32. sores, ulcers, or white spots on the lips or in the mouth
  33. sudden jerky movements of the body
  34. sudden loss of consciousness
  35. swollen glands
  36. throat discomfort
  37. tightness in the chest
  38. trouble concentrating
  39. trouble sleeping
  40. unsteadiness, trembling, or other problems with muscle control or coordination


  1. Absence of or decrease in movement
  2. change in appetite
  3. dark urine
  4. decreased sexual ability
  5. difficult or fast breathing or sudden shortness of breath
  6. increased sweating
  7. increased thirst
  8. increased urination
  9. lip smacking or puckering
  10. muscle stiffness (severe)
  11. nausea
  12. puffing of the cheeks
  13. rapid or worm-like movements of the tongue
  14. swelling or pain in the leg
  15. uncontrolled chewing movements
  16. uncontrolled movements of the arms and legs
  17. unusual bleeding or bruising
  18. unusually pale skin
  19. vomiting
  20. weakness
  21. yellow eyes or skin

Incidence not known

  1. Abdominal or stomach pain
  2. bloating
  3. burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
  4. clay-colored stools
  5. confusion as to time, place, or person
  6. constipation
  7. diarrhea
  8. epileptic seizure that will not stop
  9. feeling that others are watching you or controlling your behavior
  10. feeling that others can hear your thoughts
  11. feeling, seeing, or hearing things that are not there
  12. holding false beliefs that cannot be changed by fact
  13. inability to move the eyes
  14. increased blinking or spasms of the eyelid
  15. indigestion
  16. itching or skin rash
  17. joint pain
  18. light-colored stools
  19. muscle twitching
  20. pains in the stomach, side, or abdomen, possibly radiating to the back
  21. rhythmic movement of the muscles
  22. severe mood or mental changes
  23. sticking out of the tongue
  24. swelling around the eyes
  25. swelling of the body or feet and ankles
  26. trouble with speaking
  27. unpleasant breath odor
  28. unusual behavior
  29. unusual excitement, nervousness, or restlessness
  30. unusual facial expressions
  31. unusual weight gain
  32. upper right abdominal or stomach pain
  33. vomiting of blood

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. feeling of constant movement of self or surroundings
  4. heartburn
  5. relaxed and calm sensation of spinning
  6. sleepiness

Less common

  1. Blurred or loss of vision
  2. change or problem with discharge of semen
  3. disturbed color perception
  4. double vision
  5. halos around lights
  6. inability to sit still
  7. increase in body movements
  8. muscle ache or pain
  9. muscle weakness
  10. night blindness
  11. nightmares
  12. overbright appearance of lights
  13. pain in the back, neck, or legs
  14. pain in the chest below the breastbone
  15. severe muscle stiffness
  16. sore tongue
  17. stuffy nose
  18. tunnel vision
  19. unusual drowsiness, dullness, tiredness, weakness, or feeling of sluggishness

Incidence not known

  1. Blistering, peeling, or loosening of the skin
  2. hives
  3. increased sensitivity of the skin to sunlight
  4. painful or prolonged erection of the penis
  5. red skin lesions, often with a purple center
  6. red, irritated eyes
  7. reddening of the skin, especially around the ears
  8. severe stomach pain
  9. severe sunburn
  10. sores, welting, or blisters
  11. swelling of the eyes, face, or inside of the nose
  12. swelling of the salivary glands

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.