The Older Brain
Depression and Medication in Geriatric Patients
Treating depression in older adults is a distinct subspecialty. The aging body processes medications differently, and older patients are often on multiple other medications, increasing the risk of drug interactions. Furthermore, depression in the elderly is frequently misattributed to “normal aging” or dementia, leading to under-treatment. When it is treated, the approach must be gentle, slow, and hyper-aware of side effects.
The Risks of Untreated Depression:
In older adults, depression is not just a mood disorder; it’s a physical health crisis. It is associated with increased risk of cardiovascular events, poor outcomes after stroke, cognitive decline, and significantly higher rates of mortality. Treating depression in this population is a matter of extending both quality and quantity of life.
Choosing a Medication:
The mantra for geriatric psychiatry is “start low, go slow.” Older adults have reduced hepatic and renal function, meaning drugs are metabolized and excreted more slowly. They are also more sensitive to side effects.
Avoided Medications: Paroxetine (Paxil) is generally avoided in the elderly. It is highly anticholinergic (causing confusion, constipation, urinary retention, dry mouth) and has a short half-life, making discontinuation difficult. Tricyclic antidepressants (TCAs) like amitriptyline are also avoided due to their strong anticholinergic effects and risk of cardiac arrhythmias.
Preferred Medications: Sertraline (Zoloft) and escitalopram (Lexapro) are often favored. Sertraline has few drug interactions, which is vital for patients on multiple heart medications. Escitalopram is generally well-tolerated. Bupropion (Wellbutrin) can be used cautiously, but it can cause agitation and interacts with certain cardiac conditions.
Special Considerations: The most critical side effect to monitor in older adults is hyponatremia (low sodium levels). SSRIs can cause this in up to 5% of elderly patients, leading to confusion, lethargy, and falls. Also, any sedating medication significantly increases the risk of falls and hip fractures, which can be devastating.
Treatment in older adults often moves beyond medication. Electroconvulsive Therapy (ECT) , despite its stigma, is actually one of the safest and most effective treatments for severe, medication-resistant depression in the elderly, particularly when catatonia or psychosis is present. The key to successful geriatric treatment is a multidisciplinary approach—coordinating with primary care, cardiology, and neurology—to ensure that treating the mind does not endanger the body.