Not Medical Advice: Pill imprint 54 840 has been identified as Furosemide 20 mg.
Furosemide is used in the treatment of edema; heart failure; high blood pressure; ascites; renal failure (and more), and belongs to the drug class loop diuretics. Risk cannot be ruled out during pregnancy. Furosemide 20 mg is not a controlled substance under the Controlled Substance Act (CSA).
Furosemide is a diuretic which is an anthranilic acid derivative. Chemically, it is 4-Chloro-N-furfuryl-5-sulfamoylanthranilic acid. Furosemide, USP is a white to slightly yellow odorless, crystalline powder. It is practically insoluble in water, sparingly soluble in alcohol, freely soluble in dilute alkali solutions and insoluble in dilute acids.
Learn more about this drug from this link: http://www.drugs.com/furosemide.html .