Metoprolol-Egis (Metoprolol Tartrate)

Metoprolol is a selective β1‑adrenergic blocker used in several cardiovascular conditions.

• Hypertension: lowers systemic blood pressure by reducing cardiac output and inhibiting renin release.
• Angina pectoris: decreases myocardial oxygen demand, relieving chest pain during exertion.
• Heart failure: improves ventricular function and reduces mortality in chronic heart failure patients.
• Post‑myocardial infarction: lowers the risk of recurrent cardiac events and improves long‑term survival.

• Metoprolol selectively antagonizes β1‑adrenergic receptors in cardiac tissue, blocking the effects of endogenous catecholamines. This reduces heart rate, myocardial contractility, and conduction velocity, leading to decreased cardiac output and lower arterial pressure. The drug also diminishes renin secretion from the kidneys, contributing further to blood‑pressure control.

Metoprolol may cause a range of adverse reactions, which are grouped by frequency.

Common Side Effects

• Fatigue: feeling unusually tired or weak.
• Dizziness: light‑headed sensation, especially on standing.
• Bradycardia: slower than normal heart rate.
• Cold extremities: reduced blood flow to hands and feet.
• Gastrointestinal upset: nausea or abdominal discomfort.
• Headache: mild to moderate pain in the head.

Serious or Rare Side Effects

• Severe bradycardia: dangerously low heart rate requiring medical attention.
• Heart block: impaired electrical conduction through the heart.
• Bronchospasm: narrowing of airways, particularly in asthmatic patients.
• Hypotension: marked drop in blood pressure causing faintness.
• Allergic reactions: rash, itching, or swelling of the face and throat.
• Depression: mood changes or worsening depressive symptoms.

When prescribing Metoprolol, clinicians should observe several precautionary measures to ensure safety.

• Monitor blood pressure: check regularly to avoid excessive hypotension.
• Assess heart rate: ensure rate remains within therapeutic range.
• Use caution in asthma/COPD: β1 selectivity may not fully prevent bronchoconstriction.
• Adjust in renal/hepatic impairment: dose may need modification based on organ function.
• Avoid abrupt discontinuation: taper gradually to prevent rebound tachycardia.
• Store at room temperature: keep in the original pack, protect from moisture and direct sunlight.

Metoprolol can interact with other medicines, altering its effectiveness or safety profile.

Major Interactions (Avoid)

• Verapamil or diltiazem: combined use can cause severe bradycardia or heart block.
• Clonidine withdrawal: abrupt cessation of clonidine while on Metoprolol may precipitate hypertension.
• Other AV‑node blockers (e.g., digoxin): increase risk of conduction abnormalities.

Moderate Interactions (Monitor Closely)

• Non‑steroidal anti‑inflammatory drugs (NSAIDs): may blunt antihypertensive effect.
• Diuretics: can enhance hypotensive response.
• Antidepressants (e.g., SSRIs): may affect heart rate control.
• Antidiabetic agents: Metoprolol may mask hypoglycemia symptoms.
• Calcium channel blockers (non‑diltiazem): may require dose adjustment.