Is levofloxacin a sulfa drug

Yes, Lasix ( furosemide) does contain the compound sulfonamide in its molecular structure, so it has sulfa in it; however, it is usually considered to be a drug related to the sulfa drugs rather than a true sulfa drug. People who are allergic to sulfa may have a allergice reaction to Lasix but the chance is much smaller than to a true sulfa drug like an antibiotic in that family.