Metoprolol Sandoz (Metoprolol Succinate)

Metoprolol is a selective β1‑adrenergic blocker that acts on the cardiovascular system to control blood pressure and heart workload.

• Hypertension: lowers systolic and diastolic pressure by reducing heart rate and cardiac output.
• Chronic stable angina: decreases myocardial oxygen demand, relieving chest pain.
• Heart failure: improves survival and reduces hospitalisation by moderating sympathetic activation.
• Post‑myocardial infarction: limits adverse remodeling and recurrent ischemic events.
• Arrhythmias: controls ventricular rate in atrial fibrillation and other supraventricular tachyarrhythmias.

• Metoprolol selectively antagonises β1‑adrenergic receptors on cardiac myocytes, inhibiting catecholamine‑induced stimulation of cyclic AMP. This reduces heart rate, myocardial contractility, and conduction velocity, leading to decreased cardiac output and lower arterial pressure without significant β2‑mediated bronchial effects.

Metoprolol may cause a range of adverse reactions, most of which are dose‑related and reversible upon discontinuation.

Common Side Effects

• Fatigue or tiredness
• Dizziness or light‑headedness
• Bradycardia (slow heart rate)
• Cold extremities
• Headache
• Gastrointestinal upset (nausea, abdominal discomfort)

Serious or Rare Side Effects

• Severe bradycardia or heart block
• Marked hypotension
• Bronchospasm in patients with reactive airway disease
• Acute heart failure exacerbation
• Allergic reactions (rash, angioedema)
• Depression or mood changes

Before initiating therapy, clinicians should evaluate cardiovascular status and comorbid conditions.

• Blood pressure monitoring: ensure adequate control and avoid excessive hypotension.
• Cardiac function assessment: use cautiously in patients with decompensated heart failure.
• Respiratory caution: avoid in uncontrolled asthma or severe COPD.
• Renal/hepatic impairment: dose adjustment may be required in reduced clearance.
• Discontinuation: taper gradually to prevent rebound tachycardia or hypertension.
• Store at ambient temperature: keep in the original container, protect from moisture and direct sunlight.

Metoprolol can interact with several drug classes, altering its efficacy or safety profile.

Major Interactions (Avoid)

• Combined AV‑nodal blockers (e.g., verapamil, diltiazem): risk of profound bradycardia.
• Clonidine withdrawal: may precipitate severe hypertension.
• Insulin or oral hypoglycemics: can mask hypoglycaemia symptoms.

Moderate Interactions (Monitor Closely)

• Non‑steroidal anti‑inflammatory drugs (NSAIDs): may blunt antihypertensive effect.
• Diuretics: increase risk of electrolyte disturbances and hypotension.
• ACE inhibitors or ARBs: additive blood‑pressure lowering.
• Certain antidepressants (e.g., SSRIs): may enhance bradycardic effect.
• Calcium channel blockers (non‑diltiazem): require periodic heart‑rate checks.