Cisapride for Chickens: 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.

Cisapride is a prescription gastrointestinal prokinetic medication. In plain language, it helps the digestive tract move food forward by increasing coordinated smooth-muscle contractions in the upper GI tract. In veterinary medicine, it is most often discussed for dogs and cats, but avian vets may also use it extra-label in chickens and other birds when poor gut motility is part of the problem.

For chickens, cisapride is usually considered when a bird has crop stasis, delayed crop emptying, or other signs of reduced GI motility. It is not a cure for the underlying cause. A hen with a slow or full crop may have infection, foreign material, dehydration, pain, heavy metal exposure, reproductive disease, obstruction, or another illness that also needs attention.

In North America, cisapride is generally obtained through a compounding pharmacy rather than as a standard veterinary product. That means the concentration can vary by pharmacy, so your vet's instructions matter a great deal. Chickens are also food animals, so your vet must consider egg and meat withdrawal guidance before prescribing any extra-label medication.

Avian vets most often use cisapride as a motility-support drug, not as a stand-alone treatment. In chickens, that may include supportive care for crop stasis, slow crop emptying, ileus, or sluggish movement through the upper digestive tract. It may be paired with fluids, nutritional support, treatment of sour crop or yeast overgrowth when present, pain control, or diagnostics to look for a blockage or other root cause.

This medication is not appropriate in every chicken with a full crop. If there is a suspected mechanical obstruction, impaction, GI bleeding, or perforation, increasing contractions can make the situation worse. That is why a physical exam and, in some cases, imaging are important before treatment starts.

Your vet may also discuss cisapride when a chicken has recurrent motility problems and needs a trial of medical management at home. In those cases, the goal is often to improve comfort and help the crop or upper GI tract empty more normally while the underlying condition is being treated or monitored.

Cisapride dosing in chickens should be set only by your vet, because published avian doses are extra-label and the right dose depends on the bird's weight, diagnosis, hydration status, and whether there is any concern for obstruction or heart rhythm problems. A commonly cited avian range is 0.5-1.5 mg/kg by mouth every 8 hours, but that is a reference range, not a universal home-use dose.

Most chickens receive cisapride as a compounded oral liquid or capsule. Because compounded products come in different strengths, pet parents should double-check the label each time they refill it. Giving the wrong volume is an easy way to overdose a small bird.

If your chicken vomits, seems more distressed after dosing, or the crop becomes larger, firmer, or more painful, contact your vet promptly. If you miss a dose, ask your vet how to handle it. In many cases, doubling the next dose is not advised.

For laying hens, ask specifically about egg and meat withdrawal instructions. Cisapride is not an FDA-approved poultry drug, so withdrawal guidance may be uncertain and may require your vet to consult residue-avoidance resources before recommending whether eggs should be discarded and for how long.

Many birds tolerate cisapride reasonably well, but side effects can happen. The more common concerns are loose droppings, diarrhea, GI discomfort, or vomiting/regurgitation. Because the drug increases gut movement, some chickens may seem restless or uncomfortable if the digestive tract is irritated.

More serious reactions need quick veterinary attention. These can include incoordination, excessive salivation, muscle twitching, agitation, abnormal behavior, increased body temperature, or seizures. These signs may suggest overdose or a serious adverse reaction.

Cisapride also has an important cardiac safety concern. In susceptible patients, especially when combined with certain other medications, it can increase the risk of abnormal heart rhythms. That risk is one reason your vet may avoid it in a weak, unstable, or medically complex chicken.

See your vet immediately if your chicken becomes weak, collapses, has repeated regurgitation, develops a very distended crop, stops passing droppings, or seems to have trouble breathing after starting this medication.

Cisapride has several clinically important drug interactions. The biggest concern is with medications that can raise cisapride levels or increase the risk of dangerous heart rhythm changes. In veterinary references, this includes some macrolide antibiotics such as erythromycin and clarithromycin, and some azole antifungals such as ketoconazole, itraconazole, and fluconazole.

Other drugs may also need caution, including anticholinergics, opioids, ondansetron, benzodiazepines, cyclosporine, cimetidine, chloramphenicol, certain antiarrhythmics, fluoroquinolones, and other drugs known to affect cardiac conduction. In a chicken, even supplements and over-the-counter products matter because body size is small and dosing margins can be narrow.

Tell your vet about everything your chicken is receiving, including probiotics, crop remedies, dewormers, pain medications, and any recent antibiotics or antifungals. If your bird is a laying hen, your vet also needs that information to help with food-safety guidance and withdrawal planning.