When giving injectable products to cattle it is important to separate injections from each other by at least the width of an adult hand. Separating injections allows for more effective absorption and reduced tissue irritation. It also helps prevent products from coming into contact with each other which could lead to reduced efficacy.
Different products should also be separated horizontally. For example, don’t give a clostridial vaccine and then below it give a reproductive vaccine. If multiple injections of an antibiotic need to be given, it is okay to stack them vertically while still maintaining a hands width between injections.