varenicline

Adjunctive therapy • Brands: Chantix

Last reviewed: 2025-12-30

General information

Class: Adjunctive therapy
Common US brands: Chantix
Typical dose range: Label dosing is typically started before the target quit date with a short titration to reduce nausea, then continued for a defined course (often 12 weeks) with behavioral support (label/guideline).
Therapeutic drug monitoring not routinely recommended.
Last reviewed: 2025-12-30

Dosing & forms

Forms/strengths: Oral tablets in multiple strengths (label).
Typical range: Label dosing is typically started before the target quit date with a short titration to reduce nausea, then continued for a defined course (often 12 weeks) with behavioral support (label/guideline).

Mechanism (brief)

Nicotinic acetylcholine receptor partial agonist (α4β2) used to support smoking cessation by reducing cravings and blunting nicotine reinforcement; often paired with behavioral support (label/guideline).

Metabolism & Half‑life

Metabolism: Minimal metabolism; primarily renal excretion (label)
Half‑life: Single-dose mean 24 h

Therapeutic Drug Monitoring (TDM)

Recommended: No

View labelExact

Monitoring highlights

Track smoking status and document quit attempts, because medication doses for CYP1A2 substrates may need reassessment when smoking stops (clinical).
Monitor nausea and sleep effects early; adjust the plan based on tolerability and functional impact (label/clinical).
Monitor mood symptoms during cessation attempts, especially in people with active depression/anxiety or unstable psychiatric illness (clinical).
Renal function assessment is commonly used when comorbidity is present or when severe impairment is suspected (label/clinical).

Sources

Varenicline tablets prescribing information — DailyMed (2025)
Nicotine receptor partial agonists for smoking cessation — Cochrane Database of Systematic Reviews (2016)
Neuropsychiatric safety and efficacy of varenicline, bupropion, and nicotine patch in smokers with and without psychiatric disorders (EAGLES): a double-blind, randomised, placebo-controlled clinical trial — The Lancet (2016)
Treating Tobacco Use and Dependence: 2008 Update — U.S. Department of Health and Human Services (2008)

General information

Class: Adjunctive therapy

Common US brands: Chantix

Typical dose range: Label dosing is typically started before the target quit date with a short titration to reduce nausea, then continued for a defined course (often 12 weeks) with behavioral support (label/guideline).

Therapeutic drug monitoring not routinely recommended.

Last reviewed: 2025-12-30

Monitoring highlights

Track smoking status and document quit attempts, because medication doses for CYP1A2 substrates may need reassessment when smoking stops (clinical).

Monitor nausea and sleep effects early; adjust the plan based on tolerability and functional impact (label/clinical).

Monitor mood symptoms during cessation attempts, especially in people with active depression/anxiety or unstable psychiatric illness (clinical).

Renal function assessment is commonly used when comorbidity is present or when severe impairment is suspected (label/clinical).