Furosemide Tablets, 40 mg and 100 mg

Furosemide is a loop diuretic that we supply as oral tablets in two strengths, 40 mg and 100 mg. It is the same active ingredient sold under the brand name Lasix, which we also carry, and this guide focuses on the practical decisions that matter before you start, while you handle and store your tablets, and once your order is on its way to you.

Quick overview

Furosemide works by blocking sodium and chloride reabsorption in the loop of Henle in the kidney, which increases urine output and reduces excess fluid in the body. Prescribers use it for hypertension, oedema, and congestive heart failure, often because it acts faster and more strongly than thiazide-type diuretics. We offer 40 mg tablets in packs of 180, 270, or 360 pills, and 100 mg tablets in packs of 60, 90, 120, 180, 270, or 360 pills, with prices shown in Canadian dollars at checkout so you can pick the strength and pack size that matches an existing prescription.

Who may use furosemide

Furosemide is established for adults with fluid retention linked to heart, kidney, or liver conditions, and for blood pressure that has not responded adequately to other measures. The 100 mg strength is generally reserved for people with resistant oedema or reduced kidney function; the appropriate tablet strength and dose must be individualized by a prescriber. Furosemide tablets are classified as a prescription medicine in Canada, so a prescriber's assessment remains the appropriate way to confirm that this diuretic, and the specific strength, is right for your situation. Our checkout does not require you to upload a prescription document before we accept an order, but we still recommend having your dose confirmed by a doctor or pharmacist, particularly if you are starting treatment for the first time.

Situations that call for extra caution

• Furosemide is a sulfonamide-derived medicine, so people with a known sulfa allergy should discuss this with a prescriber before use.
• It crosses the placenta and is generally used in pregnancy only when a prescriber judges the benefit to outweigh the risk; it is not usually recommended for pregnancy-related hypertension.
• Because furosemide passes into breast milk and can reduce milk supply, breastfeeding is generally not advised during treatment.
• It can raise blood glucose, so people with diabetes may need closer glucose monitoring while taking it.
• Pediatric dosing exists but is weight-based, and the 40 mg and 100 mg tablet strengths may be too high for a small child's calculated dose.
• Dizziness or blurred vision can occur, especially soon after a dose increase, so driving or operating machinery should wait until you know how you respond.

Before you start using furosemide

Furosemide tablets can be taken with or without food, though taking them with a light meal may reduce stomach upset. Because the diuretic effect usually begins within about an hour and can last several hours, most people take their dose earlier in the day to avoid disrupted sleep from nighttime urination. Doses are typically started low and adjusted gradually to the lowest amount that controls symptoms, and treatment should not be stopped abruptly without medical advice, since fluid can reaccumulate quickly.

Before your first dose, confirm the strength on the label matches what was prescribed, mention any other medicines you take, since furosemide can interact with ACE inhibitors, lithium, certain antibiotics, digoxin, and NSAIDs, and arrange a baseline check of blood pressure, kidney function, and electrolytes if your prescriber recommends one. Ongoing monitoring of sodium, potassium, and fluid balance is a normal part of long-term loop-diuretic use.

Handling and storing your tablets

Keeping furosemide tablets in good condition protects both their effectiveness and your safety between doses.

Store the tablets at 20°C to 25°C in their original, tightly closed container, away from bathroom humidity, direct light, and heat sources such as a windowsill or car dashboard. Keep the container out of the sight and reach of children and pets, and avoid transferring tablets to an unlabelled container, since that makes it harder to confirm strength and expiry later. If you are ever unsure whether a tablet looks as expected, checking with a pharmacist before taking it is a sensible precaution.

Ordering and delivery with us

When you order Furosemide 40 mg or 100 mg tablets through our catalogue, you choose the pack size, from 60 up to 360 pills depending on strength, that fits your planned supply, and pricing is shown in Canadian dollars before you check out. If you would rather compare other diuretic options carried in our catalogue, our Diuretics selection is a useful place to look.

We pack tablets to protect them during transit and dispatch orders to residential addresses and postal boxes across Canada using your postal code for accurate routing. Our support team is available 24/7 by email, online chat, and phone, and a pharmacist is available to answer practical questions about your order. When your parcel arrives, check that the strength, tablet count, and expiry date on the packaging match your order, inspect the tablets for any damage or unusual appearance, and store them as described above right away so the first dose is ready when you need it.