Azithromycin is an antimicrobial used to treat a wide variety of bacterial, rickettsial and protozoal infections in animals. Commonly known under the brand name Zithromax, it is only FDA-approved for use in humans, but veterinarians prescribe it for a wide variety of animal species. It is of particular value in the treatment of certain respiratory tract infections. **This medication comes in powder form, with simple instructions for reconstitution.** Once mixed, the easy-to-administer liquid suspension can be given exactly as prescribed by your veterinarian. While you may not see any outward effects of the medicine right away, it should start taking effect within one to two hours, and your furry friend should be feeling better in one or two days. This drug is shipped to you in powder form due to refrigeration and discarding timeframe requirements provided by the manufacturer after mixing with the proper amount of water. **We directly source prescription medications from manufacturers and wholesale distributors registered with the FDA and licensed by applicable state boards. Guaranteed genuine, and where applicable, backed by the manufacturer.**