Dosages for the Elderly
|DOSAGES FOR THE ELDERLY|
|Special caution is advised when prescribing
for elderly patients. Keep the following points in
mind when prescribing drugs for patients of
approximately 60 years or older:
1) Renal Function: Glomerular filtration rate, renal tubular secretion and blood flow tend to decrease with advancing age, while the incidence of renal pathology increases.
2) Drug Sensitivity: Elderly patients may show unusual sensitivity or paradoxical reactions to a number of drugs. Refer to the complete prescribing information.
3) Drug Distribution: The ratio of fat to lean body weight may increase in the elderly, which affects the volume of distribution of fat-soluble drugs. Plasma albumin concentrations may be decreased in the elderly. This potentiates plasma-protein bound drugs and increases the potential for drug interactions caused by plasma-protein displacement.
4) Polypharmacy: It is important to determine the patient's current medication use, including nonprescription products, before adding any medication to determine any possible interactions.
5) Hepatic Function: Reduced function of metabolic enzymes in the liver may occur in the elderly.