Pharmacology Foundations for Practical Nurses

A medication is safe only when the drug, dose, route, patient, and clinical purpose fit together. The same tablet may relieve one patient’s symptoms and worsen another patient’s condition because age, organ function, allergies, concurrent medications, and baseline vital signs alter its effect. Before administration, identify the intended therapeutic outcome. A beta blocker may be ordered to slow a rapid heart rate, but a low heart rate or symptomatic hypotension may change the immediate decision. An opioid may be appropriate for severe pain, yet a falling respiratory rate and increasing sedation signal excessive central nervous system depression. The medication order provides direction; the patient assessment determines whether the dose can be given safely at that moment. The experienced nurse notices trends rather than isolated numbers. A single blood pressure reading may be inaccurate, but a progressive fall in blood pressure after an antihypertensive, accompanied by dizziness and reduced urine output, requires a different response. Compare the current assessment with the patient’s baseline, the medication’s expected time course, and the prescribed parameters.