**Abstract**

Veterinary pharmaceuticals include a wide range of anti-infectives and additives in the use for animal health, nutrition, reproduction, and productivity. Antimicrobials are among the most extensively used drugs in developing countries largely due to large population of livestock and the burden of infectious diseases. The introduction of penicillin in 1943 and other antibiotics thereafter provided remedies for many infections in humans and animals, reducing mortality and productivity losses. Since then, a repertoire of antibiotics and antimicrobials has been introduced as chemotherapeutics and/or prophylaxis. This success notwithstanding, many pathogens of consequences are no longer susceptible owing to emergence of antimicrobial-resistant (AMR) microorganisms. This has made treatment of infectious diseases less effective. Beside spontaneous emergence of mutant microorganisms, scientists are wary of AMR caused by intensive use of antibiotics in humans and animals, sometimes in subtherapeutic doses as preventive medicine. In developing countries, environmental exposure and persistent use of antibiotics in food animals may leave residues in the food chain. The consequences include development of AMR. In this chapter, we reviewed antimicrobial use in veterinary medicine and sequela in the emergence of AMR and described the imperative of antimicrobial stewardship in veterinary practice to combat AMR in developing countries.

**Keywords:** veterinary drugs, antimicrobial resistance, stewardship, developing countries
