Irbesartan Sun (Irbesartan)

Irbesartan acts on the renin‑angiotensin‑aldosterone system to control blood pressure and renal stress.

• Hypertension: lowers systolic and diastolic pressure, reducing the risk of cardiovascular events in adults.
• Diabetic nephropathy: slows progression of kidney damage in type‑2 diabetes by decreasing intraglomerular pressure and proteinuria.

• Irbesartan selectively blocks the angiotensin II type 1 (AT1) receptor, preventing angiotensin II from binding and triggering vasoconstriction, aldosterone release, and sympathetic activation. This antagonism leads to vasodilation, reduced sodium and water retention, and lower systemic vascular resistance, thereby decreasing blood pressure and renal workload.

Irbesartan is generally well tolerated, but adverse reactions can occur.

Common Side Effects

• Dizziness: sensation of light‑headedness, especially after standing.
• Headache: mild to moderate intensity.
• Fatigue: feeling unusually tired or weak.
• Upper respiratory tract infection: nasopharyngitis symptoms.

Serious or Rare Side Effects

• Angioedema: swelling of face, lips, tongue, or airway requiring immediate medical attention.
• Hyperkalemia: elevated blood potassium that may cause cardiac rhythm disturbances.
• Acute renal impairment: sudden decrease in kidney function, particularly in patients with pre‑existing renal disease.
• Hepatic injury: signs of liver dysfunction such as jaundice or elevated enzymes.

Before initiating therapy, clinicians should evaluate patient‑specific factors and monitor key parameters.

• Blood pressure monitoring: check regularly to ensure therapeutic control and avoid hypotension.
• Renal function assessment: evaluate serum creatinine and eGFR at baseline and during treatment.
• Electrolyte surveillance: monitor potassium levels, especially when combined with potassium‑sparing agents.
• Hepatic impairment: use with caution in patients with moderate to severe liver disease.
• Pregnancy and lactation: avoid use unless clearly indicated, as safety data are limited.
• Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Irbesartan may interact with several medicines, requiring dose adjustments or avoidance.

Major Interactions (Avoid)

• Aliskiren (in diabetic patients): combined use can increase risk of renal dysfunction and hyperkalemia.
• Potassium‑sparing diuretics or supplements: may cause dangerous elevations in serum potassium.
• ACE inhibitors: concurrent use raises the likelihood of angioedema and hyperkalemia.
• NSAIDs: can impair renal function and blunt antihypertensive effect.

Moderate Interactions (Monitor Closely)

• Thiazide diuretics: may enhance hypotensive response; monitor blood pressure.
• Lithium: can increase lithium concentrations; check serum levels.
• Cyclosporine: may raise irbesartan plasma levels; observe for toxicity.