Typical timing

• Once daily: Choose a time you can remember (e.g., morning or evening).
• If it causes dizziness: Some people prefer taking it in the evening. If symptoms persist, discuss with a clinician.
• Consistency matters: Try not to skip doses. Missing doses can reduce effectiveness.

Typical dosing ranges (general guidance)

Dosing varies by indication, age, kidney function, and other medicines. Common starting and maintenance approaches include:

• Hypertension: Often starts at 50 mg once daily; may be adjusted based on blood pressure response.
• Hypertension with left ventricular hypertrophy: Often 50 mg once daily with possible adjustments.
• Diabetes with proteinuria (kidney protection): Often 50 mg once daily; dose may be adjusted depending on tolerance and kidney function.
• Heart failure: Dosing may start lower and be increased gradually.

Important: Only follow the dose written for you on your medicine label. Do not change your dose without medical advice.

Food interactions

Losartan can be taken with or without food. Food does not generally have a clinically significant effect on absorption. This means you can take it at a time that suits your day.

• Take with water and swallow the tablet whole.
• Avoid double dosing if you miss a dose (see FAQ for what to do).

Alcohol and medicine interactions

Alcohol can affect blood pressure and can increase dizziness or light-headedness, particularly when starting losartan or increasing the dose.

• Moderation is important: If you drink alcohol, do so in moderation.
• Watch for symptoms: dizziness, faintness, or unusually low blood pressure.
• Be cautious with dehydration: vomiting, diarrhoea, or heavy alcohol use can worsen dizziness and affect kidney function.

Do not abruptly stop alcohol consumption if you are a heavy drinker without advice—sudden stopping can be dangerous. If you have questions about alcohol with your other medicines, speak with your pharmacist.

Medicine interactions (important)

Losartan can interact with other medicines, affecting blood pressure, kidney function, potassium levels, or the effectiveness of treatment. Some interactions can increase the risk of side effects.

Key interaction categories

• Potassium supplements and salt substitutes containing potassium
  Losartan can increase potassium levels. Combining with extra potassium may raise the risk of hyperkalaemia (high potassium).
• Potassium-sparing diuretics (e.g., spironolactone, eplerenone)
  May increase potassium further, requiring monitoring.
• Other medicines that affect the renin-angiotensin system (e.g., ACE inhibitors)
  Combining therapies can increase the risk of low blood pressure, kidney impairment, and high potassium. Combination therapy may be considered in specific cases, but it should be monitored closely.
• NSAIDs (e.g., ibuprofen, naproxen) and certain pain relievers
  Using NSAIDs with ARBs may affect kidney function, especially in older adults, those with dehydration, or with underlying kidney disease. If you take NSAIDs regularly, ask your pharmacist for safer options.
• Diuretics (“water tablets”)
  Combination can lead to lower blood pressure or dehydration-related effects at initiation. Your clinician may adjust doses or monitor you.
• Lithium
  Losartan can potentially increase lithium levels, raising toxicity risk. Monitoring is usually required if used together.
• Some medicines affecting liver metabolism
  Losartan is metabolised in the liver. In general, clinically important interactions are uncommon, but always check new medicines (including herbal products).

Always tell your pharmacist about all medicines you use, including:

• Over-the-counter pain relief (especially NSAIDs)
• Vitamins and herbal preparations
• Decongestants or cough/cold products

Safety profile (what to watch for)

Most people tolerate losartan well. However, like all medicines, it can cause side effects. Some effects may be more likely at the start of treatment or after dose changes.

Common or manageable side effects

• Dizziness or light-headedness
• Fatigue
• Low blood pressure (particularly if you’re dehydrated or already taking diuretics)
• Headache

Serious side effects (seek urgent medical care)

Contact emergency services or seek urgent advice if you experience:

• Swelling of the face, lips, tongue, or throat (possible angioedema)
• Difficulty breathing or severe rash
• Fainting or severe weakness

Kidney function and potassium monitoring

Because ARBs can affect kidney function and potassium levels, clinicians often monitor:

• Blood creatinine (kidney function)
• Potassium levels
• Blood pressure regularly

Monitoring is particularly important if you have kidney disease, diabetes, are older, are taking diuretics, or use NSAIDs frequently.

Practical use tips

• Take it at the same time each day to build routine.
• Check your blood pressure if advised—keep a simple log (date/time and readings).
• Rise slowly if you feel dizzy when standing up (helps reduce orthostatic symptoms).
• Stay hydrated, especially during hot weather or illness (unless you’ve been told to restrict fluids).
• Be cautious with “extra” salt substitutes and potassium-containing products.
• Don’t stop abruptly unless told to. If stopping is necessary, discuss a plan with your healthcare professional.

What to do if you miss a dose

General guidance:

• If you remember soon after your scheduled time, take the dose.
• If it’s close to the next dose, skip the missed dose and take your next dose at the usual time.
• Do not double up to make up for the missed dose.

Conditions that may require extra caution

Discuss your individual risk factors with a pharmacist or clinician if you have any of the following:

• Kidney disease or a history of high potassium
• Liver disease
• Dehydration or frequent vomiting/diarrhoea
• Low blood pressure or fainting episodes
• Stenosis of kidney arteries (where blood flow to kidneys is restricted)
• Use of multiple blood pressure medicines

Extra monitoring may be recommended to ensure the medicine is safe and effective for you.

Alternative options (if losartan isn’t suitable)

If you can’t tolerate losartan or it’s not achieving the desired result, there are several other treatment options. The best choice depends on your diagnosis, kidney function, and other health considerations.

Other ARBs

• Valsartan
• Candesartan
• Irbesartan
• Telmisartan

ACE inhibitors (sometimes considered)

• Enalapril
• Lisinopril
• Perindopril
• Ramipril

Note: ACE inhibitors are a different medicine class and can cause a persistent cough in some people.

Other blood pressure medicines

• Calcium channel blockers (e.g., amlodipine)
• Thiazide-like diuretics (e.g., indapamide)
• Beta-blockers (e.g., metoprolol)
• Other diuretics depending on your situation

Your clinician can help determine the most suitable alternative if switching is needed.

Market and legal context in Australia

In Australia, antihypertensive medicines such as losartan are regulated under the national medicines framework. Availability, supply pathways, and pharmacy supply requirements are designed to support safe use and appropriate monitoring.

Key points relevant to customers:

• Pharmacy supply: Losartan is supplied through registered pharmacies. Packaging and labelling follow Australian requirements.
• Safety monitoring: Blood pressure monitoring and periodic blood tests (for kidney function and electrolytes) may be recommended by your healthcare provider.
• Quality and sourcing: Products sold through reputable Australian channels should meet regulatory standards.

Recent guidance and clinical practice themes: In recent years, Australian prescribing has focused on personalised dosing, monitoring kidney function and potassium when using renin-angiotensin system medicines, and careful review of drug combinations—especially where there is risk of dehydration, kidney impairment, or hyperkalaemia.

Delivery and availability (online pharmacy considerations)

Availability can vary by brand and strength. Many pharmacies offer standard delivery options across Australia. Delivery timeframes depend on location and stock status.

What to expect

• Stock availability: If your exact brand/strength is temporarily unavailable, your pharmacy may suggest alternatives or restocking options.
• Packaging: Medicines are typically delivered in manufacturer packaging with dosing information.
• Delivery tracking: Many online services provide tracking details.

Storage advice

• Store tablets at room temperature as directed on the pack.
• Keep away from moisture and direct heat.
• Keep out of reach of children.

Recent guidance: staying safe with losartan

Clinical advice around ARBs generally emphasises safe initiation and ongoing monitoring. Common themes include:

• Check kidney function and potassium after starting or dose changes, particularly in higher-risk patients.
• Review “sick day” management: If you become significantly unwell (e.g., vomiting/diarrhoea), clinicians may recommend temporary review of blood pressure medicines to reduce kidney stress. Ask your pharmacist or clinician for advice tailored to you.
• Avoid unmonitored potassium addition (supplements or salt substitutes) unless specifically instructed.
• Be cautious with NSAIDs when you need pain relief—choose the safest option and discuss frequent use.

FAQ — Losartan (Losartan Potassium)

1) What is losartan used for?

Losartan is used for conditions such as high blood pressure (hypertension). It may also be used to reduce certain cardiovascular and kidney risks, including in people with diabetes and protein in the urine, and in selected patients with heart failure, depending on your individual health profile.

2) How quickly does losartan work?

Some blood pressure improvement can be seen within days, but the full effect may take several weeks. Consistent daily use is important to achieve maximum benefit.

3) Should I take losartan in the morning or at night?

Many people take it once daily at a consistent time. If you experience dizziness, some people find taking it at night helpful—however, follow your clinician’s advice and report ongoing symptoms.

4) Can I take losartan with food?

Yes. Losartan can be taken with or without food.

5) What if I miss a dose?

Take it when you remember if it’s close to the scheduled time. If it’s nearly time for your next dose, skip the missed dose. Do not take a double dose.

6) Are there foods or drinks I should avoid?

There are no specific foods that must be avoided. However, alcohol may increase dizziness or lower blood pressure. Maintain moderation and stay hydrated.

7) Can I take ibuprofen or other painkillers?

Occasional use may be acceptable for some people, but combining ARBs with NSAIDs can increase risk to kidney function in certain situations. If you need frequent pain relief, ask your pharmacist for a safer option and whether monitoring is needed.

8) Does losartan affect potassium levels?

Yes. Losartan can increase potassium in some people. Your clinician may monitor blood tests. Avoid potassium supplements or potassium salt substitutes unless instructed.

9) What side effects should I watch for?

Watch for dizziness, light-headedness, or signs of low blood pressure. Seek urgent help for symptoms like swelling of the face/lips/tongue or breathing difficulties. If you feel unwell or unusually weak, contact a healthcare professional.

10) Who should be extra cautious?

People with kidney disease, liver impairment, high potassium history, dehydration risk, or who take diuretics/NSAIDs should be monitored more closely. Always review your full medication list with a pharmacist.

11) Is it safe to stop losartan suddenly?

Do not stop abruptly without advice. Stopping can worsen blood pressure control and potentially increase cardiovascular risk. If stopping is considered, clinicians will usually guide a step-by-step plan.

12) Are there alternatives if I can’t tolerate losartan?

Yes. Other ARBs, ACE inhibitors, or different blood pressure medicines may be used depending on your condition and tolerance.

Reminder: This information is intended to support, not replace, advice from healthcare professionals. If you have questions about how losartan fits your situation—especially regarding dosing, monitoring, or interactions—speak with your pharmacist.