Tulathromycin for Ox: 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.

Tulathromycin is a prescription macrolide antibiotic used in cattle, including working oxen when your vet decides it is appropriate. In the U.S., it is sold under brand names such as Draxxin, with approved generic tulathromycin products also available. It is given by subcutaneous injection in cattle, usually in the neck, and is known for staying in lung tissue and inflammatory cells for several days after one dose.

This medication works by interfering with bacterial protein synthesis at the 50S ribosomal subunit. In practical terms, that means it helps slow or stop susceptible bacteria and some mycoplasma organisms. Because tulathromycin concentrates well in the lungs and other tissues, your vet may choose it when a long-acting injectable antibiotic makes sense for handling, labor, or animal stress.

For food animals, tulathromycin must be used with careful attention to label restrictions and withdrawal times. In cattle, labeled products are prescription-only, and your vet should guide treatment decisions based on the animal's age, production class, diagnosis, and whether the ox may enter the food chain.

In cattle, tulathromycin is labeled for the treatment of bovine respiratory disease (BRD) associated with organisms including Mannheimia haemolytica, Pasteurella multocida, Histophilus somni, and Mycoplasma bovis. It is also labeled for control of BRD in cattle at high risk of developing disease, which is why your vet may discuss it in newly received, stressed, or recently transported animals.

It is also labeled for infectious bovine keratoconjunctivitis (pinkeye) associated with Moraxella bovis and for interdigital necrobacillosis (bovine foot rot) associated with Fusobacterium necrophorum and Porphyromonas levii. That does not mean every coughing, limping, or squinting ox should receive tulathromycin. Different causes can look similar, and some cases need supportive care, pain control, hoof care, fly control, drainage, or a different antimicrobial plan.

Your vet may also weigh tulathromycin against herd-level concerns such as prior treatment response, likely bacteria on your farm, antimicrobial stewardship, and residue avoidance. For an individual ox, the best option depends on the exam findings, severity, and how confident your vet is about the underlying diagnosis.

For cattle, the labeled tulathromycin dose is 2.5 mg/kg (1.1 mg/lb) once by subcutaneous injection, which equals 1 mL per 88 lb body weight for the common 100 mg/mL formulation. In cattle, it should be given under the skin, not into the muscle, and injection sites are typically placed in the neck. Your vet should calculate the exact volume for your ox based on an accurate body weight or a close weight estimate.

Because oxen are often large, dose volume matters. As a practical example, a 1,100 lb ox would receive about 12.5 mL total of a 100 mg/mL product. Your vet may divide larger volumes between sites to reduce local tissue irritation and improve handling. Do not change the route, concentration, or frequency on your own, especially in a food animal.

Withdrawal guidance is also essential. For labeled cattle products, the meat withdrawal time is 18 days after the last treatment. Label restrictions also matter: tulathromycin products for cattle are not for use in female dairy cattle 20 months of age or older because of residue concerns. If your ox is part of a breeding, dairy, or mixed-use operation, ask your vet to confirm exactly how the label applies to that animal.

Tulathromycin is generally well tolerated in cattle, but injection-site reactions are the most common issue. Some cattle show brief pain after the shot, including head shaking, restlessness, or sensitivity at the injection site. Mild swelling can also occur. These reactions are often short-lived, but your vet should know if swelling is marked, persistent, or seems to worsen.

As with other macrolide antibiotics, hypersensitivity reactions are possible, though uncommon. Contact your vet promptly if your ox develops sudden facial swelling, hives, severe distress, collapse, or other signs that seem out of proportion to the original illness. If the animal is being treated for respiratory disease, worsening breathing effort after treatment should also be treated as urgent.

The bigger day-to-day concern is often not a dramatic side effect, but using the drug in the wrong situation. If an ox has advanced pneumonia, dehydration, severe lameness, an eye ulcer, or another condition that needs more than an antibiotic alone, delayed reassessment can lead to a poor outcome. If your ox is not improving within the timeframe your vet expects, ask for a recheck rather than repeating medication without guidance.

Tulathromycin belongs to the macrolide family, so your vet will be cautious about combining it with drugs that may compete for the same bacterial target. In general, macrolides are not usually paired with lincosamides or chloramphenicol because these drugs may compete for binding at the 50S ribosomal subunit. The real-world impact can vary, but it is still an important discussion point before layering antibiotics.

Macrolides can also have broader interaction concerns. This drug class may affect drug metabolism and transport proteins, and injectable macrolide preparations may be physically incompatible with some other medications if mixed. That is one reason your vet may prefer separate syringes, separate sites, or a different timing plan rather than combining treatments casually.

Be sure your vet knows about every product your ox has received recently, including other antibiotics, anti-inflammatories, dewormers, supplements, and medicated feeds. In food animals, interaction planning is not only about safety. It also affects residue risk, treatment records, and legal withdrawal guidance.