Cisapride for Macaws: 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 GI motility medication. It helps the digestive tract move food forward by increasing coordinated smooth-muscle activity in the esophagus, stomach, small intestine, and colon. In veterinary medicine, it is usually obtained through a compounding pharmacy, because commercially manufactured forms are not generally available in North America.

In birds such as macaws, cisapride is considered an extra-label medication. That means your vet may prescribe it when they believe it fits your bird's needs, even though the drug is not specifically labeled for macaws. Avian patients are very different from dogs and cats, so your vet will base the plan on your macaw's weight, hydration status, crop function, droppings, imaging findings, and the suspected cause of the motility problem.

Cisapride is not an antibiotic, pain medication, or anti-nausea drug. Its role is to support movement through the GI tract. If a macaw has a blockage, perforation, active GI bleeding, or another condition where pushing food forward could be risky, cisapride may be inappropriate. That is why a veterinary exam matters before treatment starts.

Your vet may consider cisapride when a macaw has signs of reduced GI motility, such as delayed crop emptying, poor movement of food through the upper digestive tract, reduced fecal output, or suspected gastrointestinal stasis. In other species, cisapride is commonly used for stasis, reflux, constipation, and megacolon. Those same prokinetic effects are why avian vets may sometimes reach for it in selected bird cases.

In macaws, cisapride is usually part of a larger treatment plan, not a stand-alone fix. A bird with crop stasis may also need warming, fluids, nutritional support, crop management, fecal testing, imaging, or treatment for an underlying infection, heavy metal exposure, pain, foreign material, or reproductive disease. If the root problem is not addressed, motility support alone may not help enough.

Because birds can decline quickly, ongoing vomiting, repeated regurgitation, a persistently full crop, black stool, severe lethargy, or straining with little output should be treated as urgent. See your vet immediately if your macaw is fluffed, weak, not eating, or has a suddenly swollen crop or abdomen.

There is no one-size-fits-all macaw dose that pet parents should use at home. Cisapride dosing in birds is individualized and should be set by an avian veterinarian. In dogs and cats, the drug is often given by mouth multiple times daily because it is short-acting and tends to start working within about 1 to 2 hours. In macaws, your vet may use a compounded liquid so the dose can be matched closely to body weight and the bird's response.

The right dose depends on several factors: your macaw's exact weight, species, hydration, liver function, heart rhythm history, whether the crop is emptying at all, and whether there is concern for obstruction. Your vet may also adjust the schedule if your bird is receiving hand-feeding formula, antifungals, antibiotics, pain medication, or other GI drugs.

Do not increase the amount, give extra doses, or continue an old prescription without checking in. If you miss a dose, contact your vet for instructions. In many cases, they will advise giving it when remembered unless it is close to the next scheduled dose, then returning to the normal plan. Never double up unless your vet specifically tells you to.

Cisapride is often well tolerated in veterinary patients, but side effects can happen. The most commonly reported problems are vomiting, diarrhea, and GI discomfort. In a macaw, that may look like increased loose droppings, abdominal discomfort, repeated regurgitation, restlessness, or reduced interest in food after dosing.

More serious signs can suggest the dose is too high or that the bird is reacting poorly. Contact your vet promptly if you notice incoordination, weakness, tremors, drooling or excess oral fluid, agitation, abnormal behavior, increased body temperature, or seizures. If your macaw collapses, has repeated regurgitation, or seems unable to perch, this is an emergency.

Cisapride was removed from the human market because of dangerous heart rhythm problems, especially when combined with certain interacting drugs or in people with specific risk factors. Those severe cardiac effects have not been commonly reported in veterinary use, but caution is still appropriate. Birds can hide illness well, so any clear change in posture, droppings, crop emptying, or activity after starting cisapride deserves a call to your vet.

Cisapride has several important drug interactions, and this matters in macaws because birds with GI disease are often on multiple medications at once. Drugs that can raise cisapride levels or increase rhythm-related risk include macrolide antibiotics such as erythromycin and clarithromycin, azole antifungals, chloramphenicol, cimetidine, and several antiarrhythmic or QT-prolonging drugs. VCA also lists caution with fluoroquinolones, procainamide, quinidine, sotalol, tricyclic antidepressants, ondansetron, opioids, benzodiazepines, anticholinergics, cyclosporine, furosemide, and warfarin-like narrow-therapeutic-index oral drugs.

For avian patients, the practical takeaway is this: give your vet a complete medication list, including compounded drugs, supplements, probiotics, herbal products, and anything borrowed from another pet. Even if a product seems harmless, it may change gut movement, absorption, or heart rhythm risk.

Do not start or stop another medication on your own while your macaw is taking cisapride. If your bird is being treated for yeast, bacterial crop disease, pain, or nausea, your vet may need to adjust the plan so the medications work together more safely.