This study showed that, in healthy volunteers, sublingual furosemide (frusemide) was well absorbed. "In healthy volunteers, sublingual administration is associated with a higher Cmax, a higher bioavailability and a more accentuated initial natriuretic response than oral furosemide. Sublingual administration may offer advantages over oral administration of furosemide in certain clinical situations."
Usefulness in our resource-limited settings might include any time when injectable furosemide is not available.