Order Losartan Online - Australian Pharmacy

Losartan is an angiotensin II receptor blocker (ARB). It blocks the AT1 receptor to reduce vasoconstriction and aldosterone release, lowering blood pressure and protecting kidney function in people with diabetes.

What Losartan is

Losartan is an oral antihypertensive medication in the angiotensin II receptor blocker (ARB) class. It selectively blocks the angiotensin II type 1 receptor, reducing vasoconstriction and aldosterone release, which helps lower blood pressure and ease the heart's workload.

After ingestion, a portion of losartan is converted to an active metabolite that helps sustain its effects. Most people take it once daily, with or without meals, and your clinician may adjust the dose based on response and tolerance.

What it is used for

The primary use of losartan is to treat essential hypertension. By lowering blood pressure, it lowers the risk of stroke and heart-related complications over time.

Beyond blood pressure, losartan is used to protect kidney function in people with type 2 diabetes and albuminuria, and it is prescribed in certain heart failure situations to improve outcomes and symptoms. In some patients with left ventricular hypertrophy, it may help reduce cardiovascular risk as part of comprehensive therapy.

Contraindications and precautions

Contraindications include pregnancy, where losartan can cause fetal harm and should be avoided. It is also contraindicated in those with a known hypersensitivity to losartan or any component of the product, and in patients with bilateral renal artery stenosis or a single functioning kidney.

Precautions include monitoring kidney function and serum potassium, since losartan can raise potassium levels, especially with kidney impairment, dehydration, or when used with potassium-sparing drugs or supplements. Caution is advised in people of African descent due to higher risk of angioedema, and in those with a history of angioedema with other ARBs or ACE inhibitors.

Breastfeeding and lactation safety is not well established; use only if clearly needed and under medical guidance. Patients with liver impairment may require dose adjustments, and elderly individuals may be more sensitive to blood pressure changes or electrolyte shifts. Seek urgent care for persistent swelling of the face or throat, or signs of severe allergic reaction.

Side effects by frequency

Common side effects include dizziness, fatigue, nasal congestion, and upper respiratory infections. Some people notice back or joint pain and mild stomach upset early in therapy.

Less common effects are sore throat, diarrhea, or heartburn. Changes in kidney function or modest rises in potassium may occur, so repeated blood tests are routine in many patients.

Serious but rare adverse events include angioedema (swelling of the lips, tongue, or throat), severe hyperkalemia, and possible kidney injury. Seek urgent medical attention if there is trouble breathing, swelling, or signs of an allergic reaction, or if you notice unusually weak muscles or confusion due to high potassium.

Interactions with other substances

Losartan can interact with other medicines that lower blood pressure, increasing the risk of dizziness or fainting. Always tell your clinician about all medicines you take, including over‑the‑counter drugs and supplements.

Potassium-sparing diuretics, potassium supplements, and high‑potassium salt substitutes can raise blood potassium to dangerous levels. Avoid combining these without medical guidance, and monitor potassium if you must use them together.

Notable drug interactions include aliskiren in patients with diabetes or kidney impairment, and NSAIDs that may reduce losartan's antihypertensive effects or harm kidney function. Lithium levels may also rise with ARB use, and careful monitoring is advised when these drugs are used together.