Which drug is excreted unchanged in urine ?
Verapamil
Furosemide
Propranolol
Thiopentone
Ans. is 'b' i.e., Furosemide Furosemide pharmacokinetics Furosemide is rapidly absorbed orally but bioavailability is about 60%. Lipid solubility is low and it is highly bound to plasma proteins. It is pay conjugated by glucuronic acid and is mainly excreted unchanged by glomerular filtration and tubular secretion.