Irbesartan E Idroclorotiazide Sandoz (Hydrochlorothiazide, Irbesartan)

Irbesartan/Hydrochlorothiazide acts on the renin‑angiotensin‑aldosterone system and renal sodium handling to lower blood pressure.

• Hypertension: reduces systolic and diastolic blood pressure in adults.
• Diabetic nephropathy: slows progression of renal impairment associated with diabetes.
• Cardiovascular risk reduction: helps lower the risk of stroke and other hypertensive complications.

• Irbesartan selectively blocks AT1 receptors, preventing angiotensin II‑mediated vasoconstriction and aldosterone release, while hydrochlorothiazide inhibits NaCl reabsorption in the distal convoluted tubule, promoting diuresis and decreasing plasma volume. The combined actions result in reduced peripheral resistance and lower blood pressure.

Common Side Effects

• Dizziness: light‑headed sensation, especially after standing.
• Headache: mild to moderate pain in the head region.
• Fatigue: feeling unusually tired or weak.
• Increased urination: more frequent need to void.
• Electrolyte imbalance: low potassium or sodium levels.
• Mild gastrointestinal upset: nausea or abdominal discomfort.

Serious or Rare Side Effects

• Angioedema: swelling of face, lips, tongue, or throat requiring emergency care.
• Severe allergic reaction: rash, itching, or hives with possible anaphylaxis.
• Acute kidney injury: sudden loss of kidney function.
• Hyperkalemia: dangerously high potassium levels.
• Severe dehydration: excessive fluid loss leading to low blood pressure.
• Blood dyscrasias: rare abnormalities in blood cell counts.

Before starting therapy, consider the following precautions.

• Monitor blood pressure: ensure target levels are achieved without excessive drop.
• Assess renal function: check serum creatinine and eGFR periodically.
• Check electrolytes: especially potassium and sodium levels.
• Avoid use in pregnancy: drug is classified as Category D and may harm the fetus.
• Use caution in elderly patients: increased sensitivity to hypotension and electrolyte shifts.
• Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Irbesartan/Hydrochlorothiazide may interact with several medicines.

Major Interactions (Avoid)

• Aliskiren: combined renin‑angiotensin blockade can increase renal impairment risk.
• Potassium‑sparing diuretics or supplements: may cause dangerous hyperkalemia.
• NSAIDs: can blunt antihypertensive effect and worsen renal function.
• Lithium: increased lithium levels leading to toxicity.
• ACE inhibitors: additive effects on potassium and renal function.

Moderate Interactions (Monitor Closely)

• Other thiazide diuretics: monitor electrolytes for additive diuretic effect.
• Beta‑blockers: may enhance blood pressure lowering.
• Calcium channel blockers: possible additive hypotensive effect.
• Antidiabetic agents: risk of enhanced hypoglycemia.
• CYP2C9 inhibitors (e.g., fluconazole): may increase irbesartan plasma concentrations.