Tulathromycin 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.

Tulathromycin is a prescription macrolide antibiotic used in cattle. In the US, it is sold under brand names such as Draxxin and several FDA-approved generic equivalents. It is given as a single subcutaneous injection in the neck for labeled cattle uses, which makes it practical when handling time needs to stay low.

This drug is designed to reach and persist in lung tissue well, so your vet may consider it when respiratory disease is a concern. Tulathromycin is not a general-purpose medication for every infection. It is used for specific bacterial diseases and specific cattle classes, and label restrictions matter.

For food animals, safety goes beyond side effects. Your vet also has to consider meat withdrawal times, whether the animal is a female dairy cow 20 months of age or older, and whether the calf is intended for veal processing. Those details can change whether tulathromycin is an appropriate option for your herd or individual cow.

In cattle, tulathromycin is FDA-approved for the treatment of bovine respiratory disease (BRD) associated with Mannheimia haemolytica, Pasteurella multocida, Histophilus somni, and Mycoplasma bovis. It is also labeled for the control of respiratory disease in cattle at high risk of developing BRD, which is often called metaphylaxis in herd medicine.

Your vet may also use tulathromycin for infectious bovine keratoconjunctivitis (pinkeye) associated with Moraxella bovis and for interdigital necrobacillosis (bovine foot rot) associated with Fusobacterium necrophorum and Porphyromonas levii. These are all label-based uses in cattle, but the right choice still depends on the animal's age, production class, exam findings, and local disease patterns.

Because tulathromycin is an antimicrobial that is important in both animal and human medicine, your vet will usually weigh it against other treatment options, prior drug exposure, and herd-level stewardship goals. That is one reason it should only be used under veterinary guidance, not as a routine catch-all shot.

For labeled cattle use, tulathromycin is typically given once at 2.5 mg/kg subcutaneously, which equals 1.1 mL per 100 lb body weight. The injection is placed under the skin in the neck, and the label says not to give more than 10 mL at one injection site. In many cases, that means larger cattle need the dose divided across more than one site.

Even though the label dose is straightforward, the decision to use it is not. Your vet will consider the animal's weight, diagnosis, hydration status, severity of illness, and whether the animal falls into a restricted class. Do not re-dose, change the route, or combine it with other antibiotics unless your vet tells you to.

Food-animal rules are especially important here. Tulathromycin products for cattle generally carry an 18-day slaughter withdrawal. They are not for use in female dairy cattle 20 months of age or older, including dry dairy cows, and are not for use in calves to be processed for veal. If there is any uncertainty about age class, dairy status, or marketing plans, ask your vet before treatment.

Tulathromycin is usually well tolerated in cattle when used according to the label, but side effects can still happen. The most common concern is a local injection-site reaction, including swelling, soreness, or a short-lived pain response after the shot. In food animals, injection-site changes can matter because they may persist long enough to affect tissue at slaughter.

Some cattle may show mild, temporary changes after injection, such as reduced appetite, quiet behavior, or sensitivity at the injection site. As with other macrolide antibiotics, hypersensitivity reactions are possible, though they are not common. If a cow develops facial swelling, hives, collapse, or breathing trouble after treatment, see your vet immediately.

Call your vet promptly if the treated cow is getting worse instead of better, develops severe depression, stops eating, becomes dehydrated, or shows new lameness, eye damage, or respiratory distress. Those signs may mean the original disease is progressing, the diagnosis needs to be revisited, or supportive care is also needed.

Tulathromycin belongs to the macrolide family. In general, macrolides may have potential interaction concerns with lincosamides and chloramphenicol because these drugs can compete for similar bacterial ribosome binding sites. The real-world impact can vary, but it is still important for your vet to know every medication the animal has received recently.

Parenteral macrolide preparations can also be physically incompatible with other injectable products, so tulathromycin should not be mixed in the same syringe unless the product labeling specifically allows it. If your cow is also receiving anti-inflammatories, fluids, other antibiotics, or herd-level metaphylaxis protocols are in play, your vet may adjust the plan to reduce overlap and protect antimicrobial stewardship.

Be sure to tell your vet about any recent antibiotics, medicated feeds, coccidiostats, or supplements used in the group. In cattle medicine, the biggest practical interaction issue is often not a classic drug-drug reaction. It is using multiple antimicrobials without a clear plan, which can complicate response assessment, residue compliance, and future treatment choices.