Tylosin for Pigs: 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.

Tylosin is a macrolide antibiotic used in swine medicine under veterinary supervision. In the U.S., it is sold in forms such as injectable tylosin and water-soluble tylosin tartrate. It works by interfering with bacterial protein production, which helps slow or stop susceptible bacteria.

In pigs, tylosin is used for specific bacterial diseases rather than as a general "catch-all" medication. Depending on the product and the situation, your vet may use it as an injection for individual pigs or as a water medication for a group. The exact product matters because the labeled uses, withdrawal times, and handling instructions are different.

Because pigs are food animals, tylosin use has extra rules. Your vet has to consider the diagnosis, the route of administration, the pig's age and weight, and any required meat withdrawal time before treatment starts. That is one reason pet parents should never guess at the dose or use leftover livestock medication without guidance.

In pigs, tylosin is commonly used for swine dysentery associated with Brachyspira hyodysenteriae and for porcine proliferative enteropathy (ileitis) associated with Lawsonia intracellularis when using labeled soluble products in drinking water. Some treatment plans also continue with medicated feed afterward, depending on the diagnosis and your vet's plan.

Injectable tylosin is labeled for swine arthritis caused by Mycoplasma hyosynoviae, swine pneumonia caused by Pasteurella species, and swine erysipelas caused by Erysipelothrix rhusiopathiae. In some cases, injectable tylosin may also be part of a broader plan for pigs with dysentery, followed by water or feed medication.

Tylosin is not the right choice for every pig with diarrhea, coughing, fever, or lameness. Those signs can also be caused by viruses, parasites, management problems, toxins, or bacteria that tylosin will not reliably treat. Your vet may recommend testing, fecal evaluation, necropsy findings, or herd-level history before deciding whether tylosin is a good fit.

Tylosin dosing in pigs depends on the formulation and the condition being treated. For Tylan Soluble, the labeled swine dose is 250 mg per gallon of drinking water (66 ppm). For swine dysentery and ileitis, labeled directions call for medicated water for 3 to 10 days, with some protocols followed by tylosin in feed for 2 to 6 weeks. Only medicated water should be available during treatment unless your vet tells you otherwise.

For injectable tylosin, the labeled dose for swine is 4 mg per pound of body weight intramuscularly twice daily. On common product labels, that equals 1 mL per 12.5 lb for Tylan 50 or 1 mL per 50 lb for Tylan 200. Treatment is typically continued for 24 hours after signs improve, but should not exceed 3 days unless your vet directs otherwise.

Dosing errors matter. Overdose can be especially dangerous in very small pigs, and product labels warn that severe reactions, including shock and death, may occur in baby pigs. Your vet also needs to account for withdrawal times: injectable tylosin products for swine have a 14-day meat withdrawal, while soluble tylosin products used in drinking water have a 48-hour meat withdrawal. If your pig is part of a food-animal household, confirm the exact product and withdrawal instructions with your vet before every course.

Many pigs tolerate tylosin reasonably well when it is used correctly, but side effects can still happen. With injectable tylosin, the most common problems are pain, swelling, and inflammation at the injection site. Pigs may also seem sore or resist handling after an intramuscular injection.

With oral or water-based treatment, some animals can develop mild digestive upset, including reduced appetite or loose stool. If a pig is already dehydrated, weak, or not drinking well, water medication can become less reliable because the pig may not consume enough of the drug.

More serious problems are uncommon but important. Product labeling warns that overdosage in baby pigs can cause severe reactions, including shock and death. Stop and contact your vet right away if you notice collapse, marked weakness, worsening diarrhea, rapid breathing, facial swelling, or signs that the pig is not drinking or eating. If your pig seems significantly ill, see your vet immediately.

Published veterinary references note that drug interactions with tylosin are not well established, so your vet should review every medication, supplement, and feed additive your pig receives before treatment starts. That includes injectable drugs, water medications, medicated feed, probiotics, and any recent antibiotics.

Because tylosin is a macrolide, your vet may be cautious about combining it with other antibiotics that can interfere with similar bacterial targets, such as chloramphenicol, clindamycin, or related macrolides, unless there is a clear reason to do so. In mixed-species homes or hobby farms, it is also important to prevent accidental exposure to other animals. Product labeling specifically warns that injectable tylosin should not be given to horses or other equines.

The safest approach is to bring your vet a full list of everything your pig is getting, including medicated feeds and over-the-counter products. That helps your vet choose a treatment plan that fits your pig's diagnosis, age, and food-safety requirements.