During the premarketing development of CHANTIX, over 4500 individuals were exposed to CHANTIX, with over 450 treated for at least 24 weeks and approximately 100 for a year. Most study participants were treated for 12 weeks or less.
In Phase 2 and 3 placebo-controlled studies, the treatment discontinuation rate due to adverse events in patients dosed with 1 mg BID was 12% for CHANTIX compared to 10% for placebo in studies of three months> treatment. In this group, the discontinuation rates for the most common adverse events in CHANTIX treated patients were as follows: nausea (3% vs. 0.5% for placebo), headache (0.6% vs. 0.9% for placebo), insomnia (1.2% vs. 1.1% for placebo), and abnormal dreams (0.3% vs. 0.2% for placebo).
Adverse Events were categorized using the Medical Dictionary for Regulatory Activities (MedDRA, Version 7.1).
The most common adverse events associated with CHANTIX (>5% and twice the rate seen in placebo-treated patients) were nausea, sleep disturbance, constipation, flatulence, and vomiting.
Smoking cessation, with or without treatment, is associated with nicotine withdrawal symptoms.
The most common adverse event associated with CHANTIX treatment is nausea. For patients treated to the maximum recommended dose of 1 mg BID following initial dosage titration, the incidence of nausea was 30% compared with 10% in patients taking a comparable placebo regimen. In patients taking CHANTIX 0.5 mg BID following initial titration, the incidence was 16% compared with 11% for placebo. Nausea was generally described as mild or moderate and often transient; however, for some subjects, it was persistent throughout the treatment period.
Table 3 shows the adverse events for CHANTIX and placebo in the 12 week fixed dose studies with titration in the first week (Studies 2 (titrated arm only), 4, and 5). MedDRA High Level Group Terms (HLGT) reported in ≥ 5% of patients in the CHANTIX 1 mg BID dose group, and more commonly than in the placebo group, are listed, along with subordinate Preferred Terms (PT) reported in ≥ 1% of CHANTIX patients (and at least 0.5% more frequent than placebo). Closely related Preferred Terms such as 'Insomnia', 'Initial insomnia', 'Middle insomnia', 'Early morning awakening' were grouped, but individual patients reporting two or more grouped events are only counted once.
Table 3: Common Treatment Emergent AEs (%) in the Fixed-Dose, Placebo-Controlled Studies (≥ 1% in the 1 mg BID CHANTIX Group, and 1 mg BID CHANTIX at least 0.5% more than Placebo)
|SYSTEM ORGAN CLASS|
High Level Group Term
0.5 mg BID
1 mg BID
| GI Signs and Symptoms|
| Abdominal Pain Includes PTs Abdominal (pain, pain upper, pain lower, discomfort, tenderness, distension) and Stomach discomfort||5||7||5|
| GI Motility/Defecation Conditions|
| Gastroesophageal reflux disease||1||1||0|
| Salivary Gland Conditions|
| Dry mouth||4||6||4|
| Sleep Disorder/Disturbances|
| Insomnia Includes PTs Insomnia/Initial insomnia/Middle insomnia/Early morning awakening||19||18||13|
| Abnormal dreams||9||13||5|
| Sleep disorder||2||5||3|
| Neurological Disorders NEC|
| General Disorders NEC|
| Respiratory Disorders NEC|
| Upper Respiratory Tract Disorder||7||5||4|
| Epidermal and Dermal Conditions|
|METABOLISM & NUTRITION|
| Appetite/General Nutrit. Disorders|
| Increased appetite||4||3||2|
| Decreased appetite/Anorexia||1||2||1|
The overall pattern, and the frequency of adverse events during the longer-term trials was very similar to that described in Table 3, though several of the most common events were reported by a greater proportion of patients. Nausea, for instance, was reported in 40% of patients treated with CHANTIX 1 mg BID in a one-year study, compared to 8% of placebo-treated patients.
Following is a list of treatment-emergent adverse events reported by patients treated with CHANTIX during all clinical trials. The listing does not include those events already listed in the previous tables or elsewhere in labeling, those events for which a drug cause was remote, those events which were so general as to be uninformative, and those events reported only once which did not have a substantial probability of being acutely life-threatening.
BLOOD AND LYMPHATIC SYSTEM DISORDERS. Infrequent: Anemia, Lymphadenopathy. Rare: Leukocytosis, Thrombocytopenia, Splenomegaly.
CARDIAC DISORDERS. Infrequent: Angina pectoris, Arrhythmia, Bradycardia, Ventricular extrasystoles, Myocardial infarction, Palpitations, Tachycardia. Rare: Atrial fibrillation, Cardiac flutter, Coronary artery disease, Cor pulmonale, Acute coronary syndrome.
EAR AND LABYRINTH DISORDERS. Infrequent: Tinnitus, Vertigo. Rare: Deafness, Meniere's disease.
ENDOCRINE DISORDERS. Infrequent: Thyroid gland disorders.
EYE DISORDERS. Infrequent: Conjunctivitis, Dry eye, Eye irritation, Vision blurred, Visual disturbance, Eye pain. Rare: Acquired night blindness, Blindness transient, Cataract subcapsular, Ocular vascular disorder, Photophobia, Vitreous floaters.
GASTROINTESTINAL DISORDERS. Frequent: Diarrhea, Gingivitis. Infrequent: Dysphagia, Enterocolitis, Eructation, Gastritis, Gastrointestinal hemorrhage, Mouth ulceration, Esophagitis. Rare: Gastric ulcer, Intestinal obstruction, Pancreatitis acute.
GENERAL DISORDERS AND ADMINISTRATION SITE CONDITIONS. Frequent: Chest pain, Influenza like illness, Edema, Thirst. Infrequent: Chest discomfort, Chills, Pyrexia.
HEPATOBILIARY DISORDERS. Infrequent: Gall bladder disorder.
IMMUNE SYSTEM DISORDERS. Infrequent: Hypersensitivity. Rare: Drug hypersensitivity.
INVESTIGATIONS. Frequent: Liver function test abnormal, Weight increased. Infrequent: Electrocardiogram abnormal, Muscle enzyme increased, Urine analysis abnormal.
METABOLISM AND NUTRITION DISORDERS. Infrequent: Diabetes mellitus, Hyperlipidemia, Hypokalemia. Rare: Hyperkalemia, Hypoglycemia.
MUSCULOSKELETAL AND CONNECTIVE TISSUE DISORDERS. Frequent: Arthralgia, Back pain, Muscle cramp, Musculoskeletal pain, Myalgia. Infrequent: Arthritis, Osteoporosis. Rare: Myositis.
NERVOUS SYSTEM DISORDERS. Frequent: Disturbance in attention, Dizziness, Sensory disturbance. Infrequent: Amnesia, Migraine, Parosmia, Psychomotor hyperactivity, Restless legs syndrome, Syncope, Tremor. Rare: Balance disorder, Cerebrovascular accident, Convulsion, Dysarthria, Facial palsy, Mental impairment, Multiple sclerosis, Nystagmus, Psychomotor skills impaired, Transient ischemic attack, Visual field defect.
PSYCHIATRIC DISORDERS. Frequent: Anxiety, Depression, Emotional disorder, Irritability, Restlessness. Infrequent: Aggression, Agitation, Disorientation, Dissociation, Libido decreased, Mood swings, Thinking abnormal. Rare: Bradyphrenia, Euphoric mood, Hallucination, Psychotic disorder, Suicidal ideation.
RENAL AND URINARY DISORDERS. Frequent: Polyuria. Infrequent: Nephrolithiasis, Nocturia, Urine abnormality, Urethral syndrome. Rare: Renal failure acute, Urinary retention.
REPRODUCTIVE SYSTEM AND BREAST DISORDERS. Frequent: Menstrual disorder. Infrequent: Erectile dysfunction. Rare: Sexual dysfunction.
RESPIRATORY, THORACIC AND MEDIASTINAL DISORDERS. Frequent: Epistaxis, Respiratory disorders. Infrequent: Asthma. Rare: Pleurisy, Pulmonary embolism.
SKIN AND SUBCUTANEOUS TISSUE DISORDERS. Frequent: Hyperhidrosis. Infrequent: Acne, Dermatitis, Dry skin, Eczema, Erythema, Psoriasis, Urticaria. Rare: Photosensitivity reaction.
VASCULAR DISORDERS. Frequent: Hot flush, Hypertension. Infrequent: Hypotension, Peripheral ischemia, Thrombosis.
The following adverse events have been reported during post-approval use of Chantix. Because these events are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.
There have been reports of depressed mood, agitation, changes in behavior, suicidal ideation and suicide in patients attempting to quit smoking while taking Chantix. Smoking cessation with or without treatment is associated with nicotine withdrawal symptoms and the exacerbation of underlying psychiatric illness. Not all patients had known pre-existing psychiatric illness and not all had discontinued smoking. The role of Chantix in these reports is not known (see WARNINGS).