Ceftiofur for Cow: Uses, Dosing & Side Effects

This information is for educational purposes only. Never give your pet any medication without your veterinarian's guidance. Dosing, frequency, and safety depend on your pet's specific health profile.

Ceftiofur is a prescription cephalosporin antibiotic used in cattle to treat certain bacterial infections. It is available in several formulations, including injectable products such as ceftiofur sodium, ceftiofur hydrochloride, and ceftiofur crystalline free acid, plus an intramammary form for some mastitis cases. Different products have different labeled uses, routes, and withdrawal instructions, so the exact product matters.

In practice, your vet may choose ceftiofur because it has activity against several important cattle pathogens and is approved for common production-animal problems like respiratory disease, foot rot, metritis, and some mastitis cases. It is not a medication pet parents or producers should dose by guesswork. In food animals, correct use also matters for milk and meat residue avoidance.

Because ceftiofur is a medically important antimicrobial, federal rules limit some extra-label uses of cephalosporins in food animals. That means your vet needs to match the right formulation, route, dose, frequency, and duration to the specific situation and production class of the cow.

In cattle, labeled ceftiofur products are used for bovine respiratory disease (BRD), acute bovine interdigital necrobacillosis (foot rot), and acute postpartum metritis. FDA also notes that ceftiofur is approved as an intramammary infusion for treatment of clinical mastitis in lactating dairy cattle associated with certain susceptible bacteria.

Which problem it is used for depends on the product. For example, shorter-acting injectable forms are commonly used when daily treatment is appropriate, while long-acting formulations may be chosen when fewer handlings are helpful. Intramammary ceftiofur products are used in the udder, not by injection, and only for labeled mastitis situations.

Your vet may also weigh herd factors such as lactation status, age, intended slaughter timing, milk sale plans, and whether the cow is systemically ill. In severe mastitis or metritis, ceftiofur may be only one part of the plan. Fluids, anti-inflammatory medication, supportive care, and close monitoring often matter just as much.

Ceftiofur dosing in cows is product-specific. For Naxcel (ceftiofur sodium sterile solution), FDA labeling describes 0.5 to 1.0 mg/lb (1.1 to 2.2 mg/kg) by intramuscular injection every 24 hours for 3 treatments, with up to 5 days total in animals not responding after the first 3 doses. For Excenel RTU (ceftiofur hydrochloride sterile suspension) used for acute metritis, the labeled dose is 1.0 mg/lb (2.2 mg/kg), equal to 2 mL per 100 lb, every 24 hours for 5 consecutive days. Some long-acting formulations such as Excede use a very different single-dose or two-dose protocol, so they should never be substituted dose-for-dose.

For mastitis, the route changes completely. Spectramast LC is an intramammary infusion, not an injectable product. That means the dose is measured per affected quarter according to the label, with milk discard and slaughter withdrawal directions that must be followed exactly.

Do not estimate weight by eye if you can avoid it. Underdosing can reduce effectiveness, and overdosing can increase residue risk and injection-site problems. In food animals, your vet should also give you clear instructions on route, site, duration, and withdrawal times for milk and meat. If a cow misses a dose or fails to improve, contact your vet rather than changing the schedule on your own.

Many cattle tolerate ceftiofur well when it is used as labeled, but side effects can still happen. The most common concerns are injection-site swelling or soreness, temporary tissue irritation, and occasional reduced appetite or mild depression in a sick animal that is already dealing with infection. With intramammary products, local udder irritation or continued abnormal milk may be part of the disease process or treatment response.

Like other beta-lactam antibiotics, ceftiofur can also cause hypersensitivity reactions in some animals. These may range from hives and facial swelling to breathing difficulty or collapse. In cattle, severe allergic reactions can progress quickly, so this is an emergency.

See your vet immediately if your cow develops labored breathing, marked swelling, weakness, collapse, worsening fever, severe diarrhea, or no improvement after the expected treatment window. Also call promptly if there is a large painful injection-site reaction, milk production drops sharply, or the cow seems more toxic rather than less.

There are fewer well-defined day-to-day drug interactions for ceftiofur than for some other medications, but that does not mean combinations are risk-free. Your vet still needs a full medication list, including other antibiotics, anti-inflammatory drugs, intramammary products, supplements, and medicated feeds. This is especially important in dairy cattle, where treatment plans can affect both clinical response and residue management.

One practical concern is not a classic interaction but a labeling and residue issue. Different ceftiofur formulations have different approved indications and withdrawal instructions, and federal rules restrict some extra-label cephalosporin use in food animals. Mixing protocols, changing routes, or extending duration without veterinary direction can create residue violations even if the cow seems clinically improved.

If your cow is receiving multiple treatments for mastitis, metritis, pneumonia, pain, or dehydration, ask your vet to review the whole plan together. That helps reduce duplicate therapy, avoid unnecessary antimicrobial exposure, and keep milk and meat withdrawal records accurate.