Safety of One-Time Baclofen Dose for Muscle Spasm in Post-Operative Patients

Introduction to Baclofen Use

• The Society for Perioperative Assessment and Quality Improvement (SPAQI) recommends taking baclofen preoperatively, including on the day of operation, indicating its safety in the perioperative setting 1
• Baclofen is a GABAB receptor agonist that acts as a centrally acting muscle relaxant, making it pharmacologically appropriate for treating post-operative muscle spasms 3

Administration Considerations

• Baclofen should be dosed appropriately based on patient age, with lower doses recommended for elderly patients 4, 5
• Dose adjustment may be needed in patients with renal impairment 4
• Caution is advised when using baclofen in patients with hepatic impairment 3

Potential Side Effects and Monitoring

• Potential side effects to monitor with one-time dosing include sedation and drowsiness 1, 6
• Dizziness is a potential side effect, and there may be an increased risk of falls, especially in elderly patients 7

Special Populations and Precautions

• Patients with obstructive sleep apnea should be cautious when using baclofen, as it may potentially worsen OSA by provoking upper airway collapse during sleep 6
• Baclofen may be considered as part of a multimodal analgesia approach to help reduce opioid requirements in post-operative pain management 8, 9

Contraindications and Cautions

• Baclofen is contraindicated in patients with known hypersensitivity to baclofen 3
• It should be avoided in patients with severe renal impairment 3
• Concurrent use of other CNS depressants requires dose adjustment to prevent excessive sedation 1

Safety of Single-Dose Administration

• The safety concerns with baclofen primarily relate to chronic use and abrupt discontinuation rather than single-dose administration 1, 2
• A single dose of baclofen is safe for managing post-operative muscle spasms when appropriately prescribed with consideration of patient factors, and the benefits generally outweigh the risks 1, 2, 8