Demadex (Torsemide)
Demadex is a brand of torsemide, the long-acting loop diuretic widely used for heart failure and oedema. It offers more reliable oral absorption and longer duration of action than furosemide, with authorised generics widely available at lower cost.
- Active ingredients
- Torsemide
- Manufacturer
- Sanofi
- Dosage forms
- tablet
- Available dosages
- 5mg, 10mg, 20mg, 100mg
- Category
- Diuretics
What is it?
Demadex is the original brand name under which Hoechst Marion Roussel (now Sanofi) introduced torsemide in the United States; FDA-approved in 1993 it was positioned as a long-acting loop diuretic alternative to furosemide. Authorised generic torsemide has been widely available since 2009 and dominates current prescribing — most clinical use today is on the generic, with Demadex-branded tablets reserved by patient or prescriber preference. According to recent heart-failure guidelines, torsemide may be preferred over furosemide for chronic heart-failure management because of its more reliable absorption.
Active ingredients
Each Demadex tablet contains 5mg, 10mg, 20mg or 100mg of torsemide. The active substance is identical between branded Demadex and authorised generic torsemide tablets, with bioequivalence required by the regulator. Most clinical use is at 10–40mg daily for heart-failure oedema; the 100mg strength is reserved for severe diuretic-resistant oedema or chronic kidney disease.
Forms and dosages
Demadex is supplied as oral tablets in 5, 10, 20 and 100mg strengths. For heart-failure oedema, typical dosing is 10–20mg once daily, titrated based on weight and symptom response. For hypertension, 5–10mg daily is sufficient. For chronic kidney disease, higher doses 100–200mg daily may be needed. Take in the morning to limit night-time urination. The dose ratio of torsemide:furosemide is approximately 1:2–4.
Indications
Demadex is approved for oedema in heart failure, hepatic cirrhosis or chronic kidney disease, and for hypertension at low doses. According to recent heart-failure guidelines, torsemide may be preferred over furosemide for chronic heart-failure management because of its more reliable absorption and the TRANSFORM-HF trial findings, although that trial showed no clear mortality benefit between the two agents.
How it works
Torsemide blocks the Na-K-2Cl cotransporter in the thick ascending limb of the loop of Henle, producing potent natriuresis and diuresis. Unlike thiazides, loop diuretics retain efficacy in patients with renal impairment. Torsemide also has additional weak aldosterone-antagonist activity that may contribute to lower potassium loss compared with furosemide at equipotent doses. Onset of diuresis is within 1 hour and duration 6–8 hours — longer than furosemide.
Frequently asked questions
Is Demadex better than furosemide for heart failure? ▾
Torsemide has more reliable oral absorption (80–90% bioavailability vs 50–60% and variable for furosemide) and longer duration. The TRANSFORM-HF trial found no clear mortality difference between them for hospitalised heart-failure patients. According to recent heart-failure guidelines, torsemide may be preferred when furosemide absorption is unreliable or when stable diuresis is required.
When during the day should I take Demadex? ▾
Take it in the morning to avoid night-time urination. Diuresis begins within 1 hour and continues for 6–8 hours, so a morning dose has its main effect during waking hours. If twice-daily dosing is prescribed, the second dose is typically taken in the early afternoon. Consistent timing helps establish steady fluid balance.
What lab tests are needed on Demadex? ▾
Serum potassium, sodium, magnesium, renal function and uric acid are checked at baseline, 1–2 weeks after starting or any dose increase, and periodically thereafter. Hypokalaemia and hypomagnesaemia are common and may require oral supplementation, ACE inhibitor combination, or potassium-sparing agents. Glucose, lipids and weight are also tracked, particularly in heart failure.
Can I take Demadex if I have a sulfa allergy? ▾
Torsemide is a sulfonamide-derived diuretic, so a true sulfa allergy is a relative contraindication. According to clinical practice, true cross-reactivity with sulfonamide antibiotics is uncommon but the prescriber must weigh risks individually. If torsemide is contraindicated, ethacrynic acid is the only loop diuretic without a sulfonamide group.
Is Demadex the same as generic torsemide? ▾
Yes — Demadex and authorised generic torsemide tablets contain the same active ingredient at the same strengths and have demonstrated bioequivalence. The generic is significantly cheaper and clinically equivalent in nearly all cases. The Demadex trademark survives mainly in the United States; in many other countries the generic name or other brands are used directly.
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The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.