Safety Considerations for Muscle Relaxants in Elderly Patients

Introduction to Muscle Relaxant Safety

The American Geriatrics Society recommends that muscle relaxants should generally be avoided in elderly patients due to increased risk of falls, sedation, and adverse effects, with tizanidine or baclofen being the least inappropriate options when absolutely necessary 1, 2

Muscle relaxants as a class are listed in the American Geriatrics Society Beers Criteria as potentially inappropriate medications for older adults due to their anticholinergic effects, sedation, and increased risk of falls 2
The effects of muscle relaxants are nonspecific and not directly related to muscle relaxation, making their use questionable when prescribed with the mistaken belief that they relieve muscle spasm 1

Cyclobenzaprine should be avoided or used with extreme caution in the elderly as it is structurally similar to tricyclic antidepressants with comparable adverse effect profiles 1
Carisoprodol should be avoided because it has been removed from the European market due to concerns about drug abuse 1 and it carries substantial abuse potential and is classified as a controlled substance 3
Baclofen may be considered when a muscle relaxant is absolutely necessary because it has documented efficacy as a second-line drug for paroxysmal neuropathic pain 1
Tizanidine may be considered with caution as it may cause significant sedative and hypotensive effects, particularly in elderly patients 3

If muscle spasm is suspected to be the root of pain, consider alternatives with known effects on muscle spasm such as low-dose benzodiazepines, though these also carry risks 1
For musculoskeletal pain, topical analgesics may provide relief with fewer systemic side effects 1

First-line approach: Avoid muscle relaxants in elderly patients whenever possible 2
If absolutely necessary, choose tizanidine or baclofen as potentially less harmful options and monitor closely for sedation, confusion, and fall risk 1
Never abruptly discontinue: Always taper muscle relaxants after prolonged use to avoid withdrawal symptoms 1, 3