One Dose Does Not Fit All: Why Metabolic Type Should Guide How Often We Prescribe
A medication prescribed at the right dose but the wrong frequency is not the right medication. This is a principle that pharmacology has understood in theory for decades and that clinical practice has been slow to absorb. The standard instruction — take once daily — reflects the average patient, a statistical construct that describes no one in particular. The actual patient sitting across from the clinician metabolizes drugs quickly, slowly, or somewhere in between, and that difference determines not only how well a treatment works but whether it causes harm. Most antihypertensive drugs are designed with a twenty-four-hour action profile in mind. The once-daily recommendation assumes that the drug will remain at therapeutically effective concentrations throughout that period, then be cleared and replaced by the next dose. For a patient with ordinary metabolic rate, this assumption is reasonable. For patients at either end of the metabolic spectrum, it is often wrong in ways that are ...