Depocillin by Merck is a procaine penicillin G veterinary antibiotic suspension for intramuscular injection. Approved for cattle, swine, sheep, horses (equine), dogs, and cats, it’s a dependable choice in livestock health products and mixed-practice care. Each mL delivers 300,000 units of penicillin G procaine (DIN 01983253) in a ready-to-use suspension. Available in 100 mL, 250 mL, and 500 mL vial sizes to suit both farm operations and small animal practices.