Introduction
Sulfonamides are commonly known as “sulfa drug” which are derivatives of sulfanilamide (p-amino benzene sulfonamide), commonly used as antibacterial veterinary
drug for treatment. Due to the excellent antibacterial property, low toxicity and low cost, it is opular against common bacterial diseases2. However, uncontrolled use
of veterinary drugs and noncompliance within the withdrawal period, pave the way for drug residues to remain in animal tissues and pass into their milk3–4 .
