A client is prescribed metoprolol succinate (Toprol-XL) for hypertension. Which client education point is MOST important?

BETA-BLOCKER DISCONTINUATION SAFETY is the most critical education point for any patient taking a beta-blocker long-term.

Mechanism: Chronic beta-blockade causes upregulation of beta-adrenergic receptors (the body compensates by growing more receptors); abrupt discontinuation exposes these upregulated receptors to full catecholamine stimulation simultaneously; the result: sympathetic surge causing tachycardia, hypertension, and in patients with coronary artery disease, angina or MI.

Teaching points: NEVER stop suddenly without medical guidance; if unable to take a dose, contact the provider; if a dose is missed, take it as soon as remembered unless close to the next dose time; store properly (some formulations need specific storage).

Side effects to monitor: Bradycardia — hold and call provider if pulse below 60 bpm; hypotension — rise slowly from sitting/lying; fatigue and exercise intolerance (common, often improves over time); impotence (beta-blockers affect sexual function).

Masking hypoglycaemia: Beta-blockers blunt the tachycardia that normally warns diabetic patients of hypoglycaemia; diabetic patients must monitor blood glucose more carefully.

Other education: Take at the same time daily (Toprol-XL is extended release — do not crush or chew); do not use over-the-counter cold medications containing pseudoephedrine (sympathomimetic effect can counteract beta-blocker); avoid NSAIDS (reduce antihypertensive effect).