Drug Interactions with Topical Cyclobenzaprine

Key Drug Interactions

• The Mayo Clinic recommends that topical cyclobenzaprine may enhance the effects of anesthetic agents, increasing the risk of sedation in patients undergoing surgery 1
• The American Geriatrics Society identifies muscle relaxants, including cyclobenzaprine, as potentially inappropriate medications for older adults, due to increased risk of anticholinergic effects, sedation, and falls 3

Special Populations and Considerations

• Older adults are at increased risk of anticholinergic effects, sedation, and falls when using cyclobenzaprine, and should be monitored closely for signs of serotonin syndrome, such as agitation, hallucinations, and rapid heart rate 2
• Patients with mild hepatic impairment should use cyclobenzaprine with caution, starting with lower doses, due to increased plasma concentrations and sedating effects 2

Perioperative Considerations

• Topical cyclobenzaprine should be held on the day of surgery due to potential interactions with anesthetics and sedatives, which may cause increased sedation 1

Monitoring and Management

• Patients using topical cyclobenzaprine should be monitored for signs of serotonin syndrome, including fever, excessive sweating, tremor, rigidity, and incoordination 3
• The cumulative anticholinergic effect of multiple anticholinergic drugs, including cyclobenzaprine, should be considered, as it may be associated with decline in cognition, functional status, and activities of daily living scores 2

Discontinuation

• When discontinuing cyclobenzaprine after long-term use, a gradual taper over 2-3 weeks is recommended to avoid withdrawal symptoms, including malaise, nausea, and headache 1