Irbesartan (Avapro): Uses, Warnings, and Key Facts

What is irbesartan?

Irbesartan is an active ingredient used for the treatment of high blood pressure and diabetic kidney disease. In the United States, the brand name mentioned in the source content is Avapro.

The source also identifies the ingredient as irbesartan hydrochloride (HCl).

How irbesartan works

Irbesartan blocks the effects of angiotensin II, a substance involved in blood pressure control, renal blood flow, and aldosterone secretion. This is why it is used as part of antihypertensive treatment.

Uses and therapeutic indications

• Essential high blood pressure.
• Nephropathy with type 2 diabetes and hypertension, as part of antihypertensive treatment.

How it is taken

Irbesartan is given by oral use and is usually taken once a day, with or without food.

The source content lists the following doses:

Because dosing can vary by condition and patient factors, the official leaflet or prescribing information should always be checked.

Contraindications

• Hypersensitivity.
• Second and third trimester pregnancy.
• Use with aliskiren in patients with diabetes or moderate to severe renal failure.

Warnings and precautions

• Severe liver failure.
• Kidney failure.
• Severe CHF or underlying kidney disease, including renal artery stenosis.
• Ischemic heart disease or ischemic cardiovascular disease.
• Mitral and aortic stenosis.
• Hypertrophic cardiomyopathy.
• Bilateral stenosis of the renal arteries or stenosis of the renal artery of a single functioning kidney may increase the risk of hypotension and renal failure.
• Black race: the source notes it may be less effective at lowering blood pressure.
• Risk of symptomatic hypotension in patients with decreased sodium and/or volume.
• No experience in recent renal transplantation.
• Not recommended in primary hyperaldosteronism.
• Dual blockade of the renin-angiotensin-aldosterone system is not recommended because of increased risk of hypotension, hyperkalemia, and changes in kidney function.
• If dual block therapy is considered essential, it should only be done under specialist supervision with close monitoring of kidney function, electrolytes, and blood pressure.
• In diabetic nephropathy, concomitant ACE inhibitor and angiotensin II receptor antagonist use should not be used.
• Risk of hyperkalaemia in patients with renal failure, frank proteinuria due to diabetic neuropathy, and/or heart failure.
• Serum potassium and creatinine should be monitored.
• Not recommended in children from 0 to 18 years.

Kidney and liver considerations

Kidney failure

The source advises assessing a lower initial dose of 75 mg in haemodialysis patients. It also states that use with aliskiren in renal insufficiency with glomerular filtration rate below 30 ml/min/1.73 m² is contraindicated.

Liver failure

Caution is advised in severe liver failure because no experience is available in the source content.

Drug interactions

• Diuretics and other antihypertensive agents: may enhance hypotension.
• Potassium supplements, potassium-sparing diuretics, salt substitutes containing potassium, heparin: may increase serum potassium.
• Lithium: toxicity may increase.
• COX-2 inhibitors, aspirin above 3 g/day, and non-selective NSAIDs: may reduce the antihypertensive effect.

Pregnancy and breastfeeding

According to the source, irbesartan is not recommended in the first trimester and is contraindicated in the second and third trimesters. The content also notes fetotoxic and neonatal toxicity risks, including decreased renal function, oligohydramnios, delay in cranial ossification, renal insufficiency, hypotension, and hyperkalemia.

For breastfeeding, the source says there is no information regarding use during lactation and recommends not administering it during this period. It also notes that a treatment with a known safety profile is preferable, especially in newborns and premature infants.

Possible side effects

The following adverse reactions are listed in the source content:

• Dizziness.
• Nausea/vomiting.
• Fatigue.
• Orthostatic dizziness.
• Orthostatic hypotension.
• Musculoskeletal pain.
• Increased CK.
• Hyperkalemia.
• Thrombocytopenia.

Not everyone experiences side effects, and this list is not a substitute for the official leaflet.

Driving and machinery

The source notes that dizziness or fatigue may occur during treatment, so caution is advised when driving or using machinery.

What to verify with a doctor or pharmacist

If you are reviewing irbesartan for yourself or someone else, it is useful to confirm the following with a healthcare professional or the official medication guide:

• The exact indication for use.
• The correct dose for the individual situation.
• Whether kidney function and potassium should be monitored.
• Whether any interacting medicines are being used.
• Whether pregnancy or breastfeeding changes the treatment plan.

Safety reminder

Do not start, stop, or change irbesartan without medical guidance. If symptoms such as severe dizziness, fainting, swelling, or signs of an allergic reaction occur, seek urgent medical advice.

FAQ

Official sources and references

The original content states that the information was written using clinical and molecular data from medicines authorized and marketed in the United States under the UNII system, and it recommends checking the FDA medication guide for the specific product.

For more detail, review the official product leaflet and trusted drug databases.