Kaptopril Krka (Captopril)

• Captopril acts on the renin‑angiotensin‑aldosterone system to lower blood pressure and improve cardiac outcomes.
• Hypertension: reduces systemic vascular resistance and lowers arterial pressure.
• Congestive heart failure: decreases preload and afterload, improving cardiac output and symptoms.
• Post‑myocardial infarction: helps prevent ventricular remodeling and reduces mortality risk.
• Diabetic nephropathy: slows progression of kidney damage by lowering intraglomerular pressure.

• Captopril selectively inhibits angiotensin‑converting enzyme (ACE), preventing the conversion of angiotensin I to the potent vasoconstrictor angiotensin II. The reduction in angiotensin II levels leads to vasodilation, decreased aldosterone secretion, and lower sodium and water retention, collectively lowering blood pressure and reducing cardiac workload. By blocking this key step, captopril also enhances bradykinin activity, which contributes to additional vasodilatory effects, and modulates renal hemodynamics, supporting its role in protecting kidney function.

Captopril may cause a range of adverse reactions, varying from mild to severe.

Common Side Effects

• Cough: dry, persistent cough.
• Dizziness: light‑headedness, especially after initial doses.
• Taste disturbances: metallic or altered taste.

Serious or Rare Side Effects

• Angioedema: swelling of face, lips, tongue, or airway.
• Severe hypotension: marked drop in blood pressure leading to fainting.
• Neutropenia: significant reduction in white blood cells.

When prescribing captopril, clinicians should consider several safety measures to minimize risks.

• Monitor blood pressure: check regularly after initiation and dose changes.
• Assess renal function: evaluate serum creatinine and potassium before and during therapy.
• Avoid in patients with a history of angioedema: risk of recurrence is increased.
• Use cautiously in diabetic patients: may affect renal perfusion.
• Pregnancy and lactation: risk unknown; discuss benefits and risks with healthcare provider.
• Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Captopril can interact with several medicines, altering its efficacy or safety profile.

Major Interactions (Avoid)

• Aliskiren (in diabetic patients): combined use may increase risk of renal impairment and hyperkalemia.
• Potassium‑sparing diuretics (e.g., spironolactone, amiloride): may cause dangerous hyperkalemia.
• Lithium: concurrent use can raise lithium levels and toxicity risk.

Moderate Interactions (Monitor Closely)

• NSAIDs (ibuprofen, naproxen): may reduce antihypertensive effect and affect kidney function.
• Thiazide diuretics: can enhance hypotensive effect and increase electrolyte disturbances.
• ACE inhibitor with other antihypertensives (beta‑blockers, calcium channel blockers): may require dose adjustment and blood pressure monitoring.