Furosemide 20 mg and 40 mg Tablets

Furosemide is a loop diuretic. Current U.S. labeling includes oral tablets in 20 mg and 40 mg strengths, and these products are prescription drugs.

Furosemide and Lasix

Furosemide is the generic drug name. Lasix is the familiar brand name historically associated with furosemide. Current product research should focus on the exact prescription product being dispensed rather than assume that a brand package is available.

DailyMed continues to list generic furosemide tablets under approved ANDAs. A record updated in March 2026, for example, identifies prescription furosemide tablets in 20 mg, 40 mg, and 80 mg strengths.

Comparing 20 mg and 40 mg products

The 20 mg and 40 mg tablets are separate prescription strengths. They should not be treated as permission to alter a prescribed dose.

Generic products can differ in:

  • tablet appearance and imprint;
  • inactive ingredients;
  • labeler or manufacturer;
  • NDC;
  • package size.

If a specific manufacturer or tablet is important, verify the current NDC and label before filling the prescription.

Price and access questions

Furosemide is widely represented by generic prescription products, but price and out-of-pocket cost can still vary. Useful comparison factors include:

  • 20 mg versus 40 mg strength;
  • quantity prescribed;
  • specific manufacturer or labeler if relevant;
  • pharmacy cash price;
  • insurance formulary and network;
  • deductible, copay, or coinsurance.

Compare like-for-like quantities and strengths. A low cash quote for one package does not necessarily represent the insured price for another.

Prescription and safety context

Furosemide can cause substantial fluid and electrolyte loss when excessive amounts are used. Current labeling states that careful medical supervision is required and that dose and schedule must be adjusted to the individual patient's needs.

For that reason, this page does not provide a dosing schedule or recommend changing between 20 mg and 40 mg tablets. A valid prescription is required in the United States.

The page also does not establish current Newberry Express Pharmacy inventory.

Sources

  • DailyMed — Furosemide tablets, 20 mg/40 mg/80 mg prescription labeling, updated March 2026: https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=e9be5c3b-4b18-7ad2-e053-2995a90a4a8b&version=2
  • DailyMed — Furosemide prescription warning and current labeling example: https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=adda78ee-0cf5-4613-a748-5d6571afe354&version=2