Procaine and benzathine penicillin G are small-spectrum penicillins with a bactericidal action against Gram-positive and Gram-negative bacteria like Campylobacter spp., Clostridium spp., Corynebacterium spp., Erysipelothrix spp., Haemophilus spp., Listeria spp., Pasteurella spp., penicillinase negative Staphylococcus spp. and Streptococcus spp. Because of the slow resorption of benzathine penicillin G, the action is maintained for two days.
- For meat: 14 days.
- For milk: 3 days.