The present invention discloses a compound solution of a sulfonamide and an
antimicrobial synergist, its preparation method, and application. The compound solution further comprises a
solvent, a pH buffer
system, and a
diluent; the
solvent is N-methylpyrrolidone, and the pH buffer
system is
triethanolamine and an
organic acid. The present invention discloses a stable, clear compound solution of a sulfonamide and an
antimicrobial synergist, and its preparation method. The compound solution can be mixed with water for administration, exhibits excellent stability and lacks a distinctive
odor after mixing with water, and eliminates problems such as uneven mixing of existing premixes and low intake of sick animals when their
appetite decreases.