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Some side effects of Chantix may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.
For the Consumer
Applies to varenicline: oral tablet
Get emergency medical help if you have any of these signs of an allergic reaction while taking varenicline (the active ingredient contained in Chantix) hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop using this medication and call your doctor at once if you have any mood or behavior changes, confusion, anxiety, panic attacks, hallucinations, extreme fear, or if you feel impulsive, agitated, aggressive, restless, hostile, depressed, hyperactive (mentally or physically), or have thoughts about suicide or hurting yourself.
Your family or other caregivers should also be alert to changes in your mood or behavior.
Call your doctor at once if you have any of these other serious side effects:
Less serious side effects of varenicline may include:
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.
For Healthcare Professionals
Applies to varenicline: oral tablet
Gastrointestinal (GI) side effects have frequently included nausea (7.2% to 40%), flatulence (6% to 9%), constipation (5% to 8.5%), upper abdominal pain (2% to 7.7%), dry mouth (4% to 6%), abdominal pain (5%), dyspepsia (5%), vomiting (1% to 5%), and GI reflux disease (1%). Diarrhea, gingivitis, dysphagia, enterocolitis, eructation, gastritis, GI hemorrhage, mouth ulceration, esophagitis, gastric ulcer, intestinal obstruction, acute pancreatitis, and gall bladder disease have been reported. At least one case of cholecystitis has also been reported, in addition to case of peritonitis and a case of hemorrhoids and rectal prolapse.
The most common side effect associated with varenicline in clinical trials was nausea. Nausea was typically transient and described as mild or moderate in intensity; however, some patients experienced persistent nausea throughout treatment.
Psychiatric side effects have included insomnia (19%), abnormal dreams (9% to 13%), sleep disorder (2%), and nightmare (2%). Anxiety, depression, emotional disorder, irritability, restlessness, aggression, agitation, disorientation, dissociation, decreased libido, mood swings, abnormal thinking, bradyphrenia, euphoric mood, hallucination, psychotic disorder, suicidal ideation, and erratic behavior have also been reported. Depressed mood, agitation, changes in behavior, and suicide have been reported during postmarketing experience. At least one case of varenicline-induced manic episode has also been reported, in addition to a case of exacerbation of schizophrenia.
A 63-year-old male with stable bipolar disorder experienced a manic episode coincident with varenicline therapy. The patient was admitted to an inpatient psychiatric unit and met criteria for a manic episode. He began exhibiting manic symptoms one week after initiating therapy with varenicline 1 mg twice daily for smoking cessation. Varenicline was stopped upon admission. Within one week of admission, he was euthymic, without manic or psychotic symptoms.
A 42-year-old female with a 17-year history of schizophrenia experienced exacerbation of schizophrenia coincident with varenicline therapy. She had been prescribed varenicline 2 mg for 5-days to help her stop smoking. The patient's mother reported a 5-day psychotic episode that began with increased activity. After she was advised to discontinue varenicline, she had no further exacerbation.
Nervous system side effects have frequently included headaches (10.3% to 19%), dysgeusia (8%), fatigue, malaise, asthenia, somnolence, and lethargy. Attention disturbances, dizziness, sensory disturbance, amnesia, migraine, parosmia, psychomotor hyperactivity, restless legs syndrome, syncope, tremor, balance disorder, cerebrovascular accident, convulsion, dysarthria, facial palsy, mental impairment, multiple sclerosis, nystagmus, impairment of psychomotor skills, transient ischemic attack, visual field defect, and drowsiness have been reported.
Respiratory side effects have frequently included influenza (3.2% to 5.8%), rhinorrhea, dyspnea, and upper respiratory tract disorder. Epistaxis, respiratory disorders, asthma, pleurisy, and pulmonary embolism have also been reported.
Dermatologic side effects have frequently included rash and pruritus. Hyperhidrosis, acne, dermatitis, dry skin, eczema, erythema, psoriasis, urticaria, and photosensitivity reaction have also been reported.
Metabolic side effects have frequently included increased or decreased appetite and anorexia. Hyperlipidemia, hypokalemia, hyperkalemia, hypoglycemia, and increased weight have also been reported.
Hematologic side effects have included anemia, lymphadenopathy, leukocytosis, thrombocytopenia, and splenomegaly.
Cardiovascular side effects have included angina pectoris, arrhythmia, bradycardia, ventricular extrasystoles, myocardial infarction, palpitations, tachycardia, atrial fibrillation, cardiac flutter, coronary artery disease, cor pulmonale, abnormal electrocardiogram, acute coronary syndrome, hypertension, hypotension, peripheral ischemia, and thrombosis.
Endocrine side effects have included thyroid gland disorders and diabetes mellitus. At least one case of pituitary hemorrhage has also been reported.
Ocular side effects have included conjunctivitis, dry eye, eye irritation, blurred vision, visual disturbance, eye pain, acquired night blindness, transient blindness, cataract subcapsular, ocular vascular disorder, photophobia, and vitreous floaters.
Hypersensitivity side effects including seasonal allergy (2.6% to 5.9%) have been reported.
Genitourinary side effects have included abnormal urine analysis, polyuria, nocturia, urine abnormality, urinary retention, menstrual disorder, erectile dysfunction, and sexual dysfunction. At least one case of ovarian hematoma has also been reported.
Musculoskeletal side effects have included arthralgia, back pain, muscle cramp, musculoskeletal pain, myalgia, arthritis, osteoporosis, and myositis.
Renal side effects have included nephrolithiasis, urethral syndrome, and acute renal failure. At least one case of elevated blood creatinine has also been reported.
Immunologic side effects commonly reported have included nasopharyngitis (35.9% to 51%), bronchitis, sinusitis, fungal infection, and viral infection.
Hepatic side effects including abnormal liver function tests have been reported.
Other side effects have included tinnitus, vertigo, deafness, Meniere's disease, chest pain, influenza-like symptoms, edema, thirst, chest discomfort, chills, pyrexia, increased muscle enzyme, and hot flash. At least one case of feeling abnormal has been reported, in addition to a case of elevated aspartate aminotransferase, two cases of elevated alanine aminotransferase, and one case of elevated blood bilirubin.
If you are currently taking prescription medication for your symptoms and are interested in building more health and perhaps getting off your medication by addressing the cause of your health concern, please call the office and let us discuss your options. I will work with your medical doctor to restore your health and reduce or eliminate the need for medication.
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