Furosemide Tablets: 40 mg and 100 mg

We stock Furosemide as oral tablets in two strengths, 40 mg and 100 mg, matching the same active ingredient found in the brand Lasix. Furosemide belongs to the loop diuretic class and is used to reduce fluid buildup (edema) associated with congestive heart failure and other conditions, and to help manage hypertension. This guide walks through what to check before starting it, how to handle and store the tablets, and how ordering and delivery work with us.

Quick Overview

Furosemide works by blocking sodium and chloride reabsorption in the loop of Henle in the kidney, which increases urine output and helps the body shed excess fluid. For edema, this typically brings noticeable diuresis within about an hour of an oral dose, with effects lasting roughly six hours. For hypertension, furosemide lowers blood pressure partly through this fluid-reducing action, though it is generally considered less commonly used than thiazide diuretics for long-term blood pressure control alone. Our tablets are supplied in 40 mg and 100 mg strengths so that a prescriber's chosen regimen, whether a lower maintenance dose or a higher dose for more pronounced fluid retention, can be matched to an appropriate pack.

If you are exploring diuretic options generally, our Diuretics category lists related medicines, and our Blood Pressure category covers other options for hypertension management.

Who May Use Furosemide

Furosemide is prescribed to adults for edema linked to heart, liver, or kidney disease and for hypertension, with the dose individualized to response. Pediatric use is possible but requires strict weight-based dosing, since doses above 6 mg/kg are not recommended, and premature infants carry specific risks that a pediatric clinician must weigh. Pregnancy is a situation where a clinician needs to balance potential benefit against fetal risk, since human data remain limited. Breastfeeding calls for similar caution, since furosemide passes into breast milk and, as a potent diuretic, may reduce milk supply. Anyone with a known sulfonamide (sulfa) allergy should mention this before starting, because a cross-reaction to furosemide is possible. People with diabetes should expect closer glucose monitoring, since furosemide can raise blood sugar and cause glucose to appear in urine. Because dizziness, lightheadedness, or blurred vision can occur, especially after the first few doses, it's worth being cautious about driving or operating machinery until your response to the medication is known.

Before You Start Furosemide

A few practical checks make the first doses smoother. Furosemide can be taken with or without food, though taking it with a meal may reduce stomach upset for some people. Because it increases urination, many people prefer taking a dose earlier in the day rather than at bedtime, to avoid disrupted sleep. Your prescriber will usually want baseline and periodic monitoring of electrolytes (particularly potassium and sodium), kidney function, and blood pressure, since loop diuretics can lower potassium and cause dehydration if fluid losses aren't tracked. Furosemide interacts with several other medicines: it can increase the risk of low potassium with certain other drugs, raise digoxin toxicity risk if potassium drops, interact with lithium levels, and have reduced effectiveness when taken alongside NSAIDs. Aminoglycoside antibiotics combined with furosemide raise the risk of hearing-related side effects. Sharing a full medication list with your prescriber before starting helps them anticipate these interactions.

Reviewing personal risk factors, such as sulfa allergy history, pregnancy or breastfeeding status, diabetes, and how you personally respond to blood-pressure changes, gives you and your prescriber a clearer starting point before the first tablet.

Handling and Storage

Once your furosemide tablets arrive, keeping them properly stored protects their potency for the full course of treatment. Store the tablets at 68°F to 77°F, in their original, tightly closed container, away from direct light and excess humidity, such as a bathroom cabinet with a shower nearby. Keep the container out of sight and reach of children and pets, since accidental ingestion of a diuretic can cause significant fluid and electrolyte shifts. Avoid transferring tablets to unlabeled pill organizers for extended periods if you can help it, since original packaging helps preserve stability and keeps dosing information at hand.

If tablets look discolored, crumbled, or damaged, check with a pharmacist before taking them. Tablet appearance can vary between manufacturers, so a pharmacist can also verify whether an unexpected change is normal for that fill or may indicate a storage or quality issue.

Ordering and Delivery

Furosemide is classified as a prescription medicine in the United States, which reflects how the medicine is regulated at a national level. The FDA approval status of this exact catalog product cannot be confirmed without a US application number, NDC, labeler, or manufacturer. Separately, our own ordering process for this listing does not require you to submit a prescription to place an order, so you can complete checkout without prescription paperwork if you prefer. We offer 40 mg tablets in packs of 180, 270, or 360, and 100 mg tablets in packs of 60, 90, 120, 180, 270, or 360, so you can choose a quantity suited to your prescribed regimen and intended supply. If you're comparing furosemide to the branded version, our Lasix listing carries the same active ingredient under the brand name.

Our team has supported customers since 2017, and our pharmacist-backed support is available 24/7 by email, online chat, and phone if you have questions about strengths, pack sizes, or your order status before or after checkout. Once an order is placed, we pack it securely and ship it to the address you provide.

When your package arrives, check that the strength and quantity on the label match what you ordered, and inspect the seal before opening. If anything looks incorrect or damaged, our support team can help sort it out quickly so your next dose isn't delayed.