Baclofen's Mechanism and Clinical Application in Esophageal Motility Disorders

Mechanism of Action and Clinical Effects

Baclofen works by inhibiting transient lower esophageal sphincter relaxations (TLOSRs) through GABA-B receptor agonism, making it specifically effective for regurgitation and belch-predominant symptoms in GERD, though its use is limited by central nervous system and gastrointestinal side effects 1, 2

The American Gastroenterological Association (AGA) recommends baclofen specifically for regurgitation or belch-predominant symptoms as personalized adjunctive therapy, not for empiric use across all GERD phenotypes 1, 2, 3
Baclofen is positioned as adjunctive therapy for mild regurgitation and belching disorders, particularly when these symptoms persist despite PPI optimization 1, 4

Central nervous system side effects (drowsiness, dizziness, sedation) and gastrointestinal symptoms frequently limit clinical use, occurring in a significant proportion of patients 1, 2, 4
Baclofen is contraindicated or should be avoided in patients with dementia due to risks of worsening cognition, sedation, and potential for withdrawal complications 5
The drug may worsen obstructive sleep apnea by promoting upper airway collapse, requiring caution in patients with sleep disorders 5, 6
Abrupt discontinuation must be avoided due to potentially life-threatening withdrawal symptoms including hallucinations, delirium, seizures, and autonomic instability 4, 5

Start with low doses (5-10 mg/day) and titrate slowly to minimize side effects, with typical therapeutic dosing around 40 mg for reflux management 4, 5

Pediatric guidelines do not support routine use of baclofen as a prokinetic agent for GERD in infants or children due to insufficient evidence and significant adverse effect profiles 7
The 2013 Pediatrics guidelines emphasize that prokinetic agents including baclofen have not demonstrated benefits outweighing risks in the pediatric GERD population 7

Do not use baclofen empirically across all GERD patients—it is specifically indicated for regurgitation/belching phenotypes, not typical heartburn 1, 3
Avoid combining with other CNS depressants due to additive sedative effects and increased risk of respiratory depression 5
Educate patients about withdrawal risks before initiating therapy, particularly if higher doses are used for extended periods 4, 5