Lincomycin 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.

Lincomycin is a lincosamide antibiotic used in swine medicine for specific bacterial infections that your vet believes are likely to respond to this drug. In the U.S., approved swine products include injectable lincomycin and water- or feed-use lincomycin products under veterinary oversight, depending on the formulation and indication.

For pigs, lincomycin is not a general-purpose antibiotic for every cough or diarrhea case. It is usually chosen when the disease pattern, herd history, exam findings, and sometimes testing suggest problems such as swine dysentery, mycoplasma pneumonia, or certain infectious arthritis cases caused by susceptible organisms.

Because pigs are food animals, lincomycin use also involves label directions, withdrawal times, and recordkeeping. That makes it especially important to work closely with your vet before treatment starts, even if the medication sounds familiar from previous herd use.

In pigs, lincomycin is commonly used for swine dysentery, a serious intestinal disease that can cause mucoid or bloody diarrhea, dehydration, poor growth, and rapid spread through a group. Oral lincomycin products have been approved for treatment of swine dysentery, and some feed-use products have also been used under a Veterinary Feed Directive when labeled.

Lincomycin is also used for mycoplasma pneumonia in swine. This condition often shows up as coughing, slower growth, uneven groups, and chronic respiratory disease rather than sudden collapse. Injectable lincomycin is labeled for treatment of mycoplasma pneumonia, and feed-use lincomycin has also been used to reduce disease severity in some labeled settings.

Another labeled use is infectious arthritis caused by susceptible bacteria, including organisms such as staphylococci, streptococci, Erysipelothrix, and Mycoplasma species. Pigs with joint infections may be lame, reluctant to rise, swollen at one or more joints, or losing condition because movement hurts.

Your vet may also decide lincomycin is not the best fit. Culture results, herd-level resistance concerns, age group, pregnancy or breeding status, water intake, and food safety rules can all change the plan.

Lincomycin dosing in pigs depends on the formulation, body weight, diagnosis, and route. For injectable lincomycin, labeled swine dosing is 5 mg per pound (about 11 mg/kg) intramuscularly once daily for 3 to 7 days for arthritis or mycoplasma pneumonia. Product concentration matters: the 100 mg/mL product is dosed at 1 mL per 20 lb, while the 300 mg/mL product is dosed at 1 mL per 60 lb.

For oral soluble powder in drinking water, the FDA freedom-of-information summary for LINCOMIX lists 250 mg of lincomycin per gallon of drinking water for swine dysentery. Water medication only works well if pigs are still drinking reliably, so your vet may change the approach if affected pigs are weak, dehydrated, or off water.

Do not guess the dose from another species, another farm, or an old bottle. In food animals, even small dosing mistakes can affect treatment success, residue risk, and legal withdrawal timing. Your vet may also recommend diagnostics, supportive care, and isolation steps alongside the antibiotic.

Important safety note: label information for oral soluble powder states that safety has not been demonstrated for pregnant swine or swine intended for breeding. Injectable products also carry slaughter withdrawal instructions, so ask your vet to write down the exact treatment dates and when treated pigs can safely enter the food chain.

The most commonly noted side effect in pigs is diarrhea or loose stool, especially early in treatment. With injectable lincomycin, the label notes this reaction is usually transient, but pigs can still become dehydrated if diarrhea is significant or if they are already sick.

Some pigs may also have reduced appetite, worsening dehydration, or lack of improvement within 24 to 48 hours, which can mean the diagnosis is incomplete, the infection is severe, or the bacteria are not responding as expected. Injection-site soreness can also happen after intramuscular treatment.

Although uncommon, hypersensitivity reactions are possible with antibiotics. Contact your vet promptly if you notice facial swelling, sudden weakness, collapse, severe distress, or a rapid decline after dosing.

See your vet immediately if a pig has bloody diarrhea, marked breathing effort, cannot stand, stops drinking, or becomes severely depressed. Those signs may reflect the disease itself rather than the medication, but they need urgent veterinary attention either way.

Lincomycin can interact with other medications, so your vet should review everything the pig or group is receiving, including injectable drugs, water medications, feed medications, and recent treatments. This matters even more in pigs because herd treatment plans often involve multiple products at once.

As a lincosamide, lincomycin should generally not be combined with macrolide antibiotics unless your vet has a specific reason. Merck also notes that lincosamides should not be combined with bactericidal antibiotics in some situations because the drugs may interfere with one another.

Lincomycin can have additive neuromuscular effects with anesthetic agents and skeletal muscle relaxants. That means your vet should know if a pig is scheduled for sedation, anesthesia, or another procedure. Oral absorption can also be reduced by kaolin-pectin products.

There are also regulatory interactions to keep in mind. In June 2023, the FDA announced withdrawal of the approved fenbendazole + lincomycin combination medicated feed for swine, so that combination can no longer be manufactured or newly authorized under a VFD. If your herd uses medicated feed, ask your vet to confirm that every combination remains currently allowed and correctly labeled.