Muscle Relaxant Use in the Elderly

Introduction to Muscle Relaxant Use

The American Geriatrics Society recommends avoiding muscle relaxants in elderly patients due to their anticholinergic effects, sedation, and increased fall risk, but if necessary, baclofen is the preferred agent, starting at 5 mg three times daily with gradual titration to a maximum of 30-40 mg per day 1, 2

The American Geriatrics Society recommends baclofen as the preferred muscle relaxant for elderly patients because it has documented efficacy as a GABA-B agonist for muscle spasm and spasticity, particularly in CNS injury and neuromuscular disorders 2
Baclofen should be started at 5 mg three times daily and titrated gradually, increasing weekly by small increments to minimize dizziness, somnolence, and gastrointestinal symptoms 1, 2
The maximum tolerated dose of baclofen is typically 30-40 mg per day in elderly patients, and it must never be discontinued abruptly to avoid withdrawal symptoms including delirium, seizures, and CNS irritability 2

Cyclobenzaprine should be avoided in elderly patients due to its strong anticholinergic properties, CNS impairment, delirium, slowed comprehension, and falling, with plasma concentrations in elderly subjects being approximately twice as high as in younger adults 3, 4, 2
Methocarbamol elimination is significantly impaired in patients with kidney disease, causing drowsiness, dizziness, bradycardia, and hypotension, and it should be held on the day of any surgical procedure 1, 2
Tizanidine should be avoided in older adults due to significant sedation and hypotension, with clearance reduced by more than 50% in elderly patients with renal insufficiency 2
Carisoprodol is classified as a controlled substance with substantial abuse and addiction potential and should be avoided in elderly patients, having been removed from the European market due to concerns about drug abuse 2
Metaxalone is contraindicated in patients with significant hepatic or renal dysfunction and has multiple CNS adverse effects including drowsiness, dizziness, and irritability 1, 2

Topical analgesics should be used for focal musculoskeletal pain as a first-line approach, providing relief with fewer systemic side effects 1, 2
Scheduled acetaminophen may be effective for mild to moderate musculoskeletal pain in elderly patients 4, 2
Non-pharmacological approaches should be considered for muscle spasm management first 2

In elderly patients with impaired renal function, baclofen remains the preferred option but requires cautious dosing and monitoring, while tizanidine should be avoided entirely, and methocarbamol and metaxalone are contraindicated 2, 1, 2

When baclofen is prescribed, patients should be assessed for drowsiness and fall risk at each visit, and monitored for dizziness, somnolence, and gastrointestinal symptoms during titration 1, 2
Baclofen should not be prescribed with other anticholinergic medications, and caution should be exercised with concurrent use of sedatives, antihypertensives, or diuretics 1

Muscle relaxants should be avoided entirely in frail patients with mobility deficits, weight loss, weakness, or cognitive deficits, as sedating medications with anticholinergic properties are associated with decline in cognition, functional status, and activities of daily living scores in older patients 2, 3