Furosemide Tablets 40 mg & 100 mg

Furosemide is a loop diuretic used to treat fluid retention (oedema) associated with congestive heart failure and other conditions, and it is also prescribed for hypertension. We supply it as oral tablets in 40 mg and 100 mg strengths, with the same active ingredient as the brand Lasix if your prescriber has specified that name. Furosemide works by blocking salt and water reabsorption in the kidneys, so more fluid passes into the urine, easing swelling and helping to lower blood pressure.

Quick overview

We offer 40 mg tablets in quantities of 180, 270 or 360, and 100 mg tablets in quantities of 60, 90, 120, 180, 270 or 360, so you can match a pack size to how long you expect to need treatment. The tablets are taken by mouth, usually once daily in the morning, though some people are prescribed a twice-daily schedule. Furosemide generally starts working within about an hour, and its diuretic effect typically lasts six to eight hours, which is why timing matters for daily comfort.

Who this tablet suits

Furosemide is established for adults being treated for oedema and hypertension, and it also has a role in paediatric care, though children need strict weight-based dosing under close supervision rather than a standard adult strength. A few groups need particular caution before starting:

• Anyone with a known allergy to furosemide or sulfonamide medicines should not take furosemide and must tell their prescriber, as cross-reactivity is possible.
• Furosemide is not recommended during pregnancy unless there is a compelling medical reason, and it is not used for gestational hypertension or physiological pregnancy-related oedema.
• Breastfeeding is generally avoided with furosemide, since it passes into breast milk and can reduce milk supply.
• People with diabetes may need closer blood glucose monitoring because furosemide can reduce glucose tolerance and occasionally unmask latent diabetes.
• Furosemide can cause dizziness or a drop in blood pressure, particularly after the first dose or a dose increase, so driving or operating machinery should wait until you know how you respond.

If you are exploring other options for blood pressure management, our Blood Pressure range covers related medicines your prescriber may consider alongside or instead of a diuretic.

Before using furosemide

Before the first dose, it helps to confirm a few practical points with your prescriber or pharmacist: current kidney function, electrolyte levels (particularly potassium and sodium), and any other medicines you take. Furosemide can interact with NSAIDs, other blood pressure medicines, lithium, digoxin and certain antibiotics, so a full medicine review before starting is worthwhile. It can be taken with or without food; taking it with a light meal may reduce stomach upset for some people. Because it increases urination, an early-morning dose is usually more practical than an evening one.

During treatment, your healthcare professional may monitor blood pressure, body weight, kidney function and electrolyte levels. Increased urination, thirst and mild dizziness can occur, but fainting, severe weakness or muscle cramps, confusion, markedly reduced urination, hearing changes or signs of an allergic reaction require prompt medical advice.

Handling and daily routine

Swallow furosemide tablets whole with a glass of water rather than crushing or chewing them, unless your prescriber has advised otherwise. If a dose is missed, take it as soon as you remember unless it is close to your next scheduled dose, in which case skip it rather than doubling up. Keep a consistent daily routine, since regular timing supports steady fluid control and makes side effects like dizziness more predictable.

Storing your tablets correctly

Store furosemide tablets at 20°C to 25°C in their original, tightly closed container, away from direct light and humidity such as a bathroom cabinet. Keep the pack somewhere secure and out of the sight and reach of children and pets. The diagram below summarises these steps at a glance.

Ordering and delivery through us

Furosemide is classified as a Schedule 4 Prescription Only Medicine in Australia and requires a prescription from an authorised prescriber. Separately, our own ordering process for this listing does not require you to upload a prescription before we accept your order, so you can choose your preferred strength and pack size, complete checkout and arrange payment without that extra step on our side. We recommend keeping any prescription details on hand in case your usual healthcare provider needs to review your treatment.

Once your order is placed, we pack it discreetly and dispatch it to your nominated Australian address or post office box, with online tracking so you can follow its progress from dispatch to arrival. Our support team is available 24/7 by email, online chat or phone, including access to a pharmacist if you have questions about your pack, dosing routine or storage once it arrives.

When your parcel arrives, check that the strength and pack size on the label match what you ordered, that the tablets are intact, and that the container is undamaged before you begin your regular routine.