Varenicline (Oral Route)

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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
  • Difficult or labored breathing
  • Shortness of breath
  • Tightness in chest
  • Wheezing
Incidence not known
  • Changes in behavior
  • Thoughts of killing oneself

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
  • Abnormal dreams
  • Bloated, full feeling
  • Change in taste
  • Difficulty having a bowel movement (stool)
  • Dry mouth
  • Excess air or gas in stomach or intestines
  • General feeling of discomfort or illness
  • Headache
  • Lack or loss of strength
  • Loss of taste
  • Nausea
  • Passing gas
  • Sleeplessness
  • Stomach pain
  • Trouble sleeping
  • Unable to sleep
  • Unusual tiredness or weakness
Less common
  • Acid or sour stomach
  • Belching
  • Body aches or pain
  • Chills
  • Cough
  • Decreased appetite
  • Ear congestion
  • Fever
  • Heartburn
  • Increased appetite
  • Indigestion
  • Itching skin
  • Loss of appetite
  • Loss of voice
  • Nasal congestion
  • Nightmare
  • Rash
  • Runny nose
  • Sleepiness or unusual drowsiness
  • Sneezing or sore throat
  • Stomach discomfort or upset
  • Unusual drowsiness, dullness, or feeling of sluggishness
  • Vomiting
Incidence not known
  • Anxiety
  • Discouragement
  • Feeling sad or empty
  • Hyperventilation
  • Irregular heartbeats
  • Irritability
  • Loss of interest or pleasure
  • Nervousness
  • Restlessness
  • Shaking
  • Trouble concentrating

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.

Precautions

DR601853

Portions of this document last updated:

Nov. 1, 2009

Source: Drug Information provided by: Micromedex

Copyright © 2009 Thomson Healthcare Inc. All rights reserved. Information is for End User's use only and may not be sold, redistributed or otherwise used for commercial purposes.


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