Drugs and the Elderly

Never before have doctors had such an abundance of therapeutic options. And—not surprisingly—elderly patients are taking more medications than ever.

A national survey from 1998 revealed that more than 40% of elderly American adults take five or more medications a day—and that’s at home. Meantime, drug-related complications have risen steadily.

In 2005, the United States spent $177 billion in the management of drug-related problems—$34 billion more than was spent on the drugs themselves.1 Because up to a third of adverse medication effects warrant a hospital admission, hospitalists are the front line in the diagnosis and treatment of these syndromes.

Additionally, medication-related consequences can complicate hospitalizations required for other reasons. They can be observed as frequently as weekly according to hospitalist Balazs Zsenits, MD, FACP, of Rochester (N.Y.) General Hospital—and they’re often serious. In fact, medication reactions are so frequently fatal they represent the fifth-leading cause of death in the United States.

As one might expect, the elderly are disproportionately affected by the potentially toxic consequences of medication. In fact, a 2005 study published in Pharmacotherapy revealed that more than two-thirds of hospitalized elderly adults had an adverse drug effect over a four-year period.2 Among the more common outcomes were constipation, falls, immobility, confusion, hip fractures, and a decline in functional status requiring nursing home placement. Moreover, the authors noted that drug side effects frequently mimicked other geriatric syndromes, prompting physicians to prescribe additional medication.

While multiple medications may be necessary to prevent the progression of disease in older people, the overuse and misuse of drugs has been linked to serious health problems, including hospitalizations and death.

Table 1. Common Adverse Drug Events and Clinical Outcomes

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Polypharmacy

Patients at greatest risk for a polypharmacy-associated medical complication are those taking five or more concurrent drugs, those with multiple physicians, patients with significant medical comorbidities or impairments in vision or dexterity, and individuals who have recently been hospitalized.4-5 At least 25% of elderly Americans fall into at least one of these categories

But polypharmacy is not the only reason elderly patients experience a disproportionately high rate of adverse medication effects. Age-related altered drug metabolism is also responsible for unexpected drug consequences in this age group.

Aging influences every aspect of physiologic drug processing. While the absorption of oral medications from the GI tract remains relatively constant in the absence of disease states and gastric pH altering medications, bioavailability and clearance dramatically change with aging. These changes become the most pronounced after age 75, when kidney and liver function become limited.

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