Cisapride (Propulsid) for Cats

What Is It Called and How Is It Given?

Generic Name: Cisapride.
Brand Names: Propulsid was the historical human pharmacy brand. Today, it is strictly acquired through specialized veterinary compounding pharmacies.
Available Formats: Because it must be custom made by a compounder, this medication is typically formulated as a flavored oral liquid suspension, tiny capsules, or occasionally as a transdermal gel rubbed inside the ear tip.

Why Does My Cat Need This?

Plain English Goal: Cisapride is a powerful motility agent. Chronic, severe constipation caused by advanced kidney dehydration is aggressively managed by forcing the paralyzed or sluggish intestines to begin moving again. It is frequently utilized to treat a condition called megacolon, where the bowel becomes permanently stretched and weak.
Target Symptoms and Lab Markers: Severe straining in the litter box, producing small rock hard stools, chronic vomiting from backed up waste, and the total refusal to eat are directly targeted. Success is verified by caregivers observing the return of daily, comfortably passed, log shaped stools.
Response Window: Increased bowel movement and restored litter box habits are typically observed within twenty four to seventy two hours of starting the medication.

How It Works

The Conveyor Belt Engine: In plain English, the feline digestive tract operates exactly like a muscular conveyor belt. When severe constipation or megacolon occurs, the engine running that belt completely stalls out, leaving waste stranded in the colon. Cisapride acts as a direct electrical jump start for the gut. The specific nerve receptors inside the stomach and intestines are chemically triggered, commanding the muscles to powerfully contract and push the stranded waste toward the exit.

Tips for Giving the Dose

Food Rules and Flavor: The medication is highly recommended to be administered exactly fifteen to thirty minutes before a meal. Taking it before food actively turns the conveyor belt on just as the new meal is preparing to enter the stomach.
Compounding Guard: If a custom oral liquid is utilized, the bottle must be rigorously shaken before every single dose. Because the medication is suspended in the flavored syrup, the active drug will naturally sink to the bottom. If it is not shaken, the final doses in the bottle will be dangerously concentrated.
Missed Dose Protocol: If a dose is missed, the normal schedule should be resumed before the next meal. A double dose must never be given, as severe cramping can occur.

Important Hydration and Kidney Warnings

Hydration Dependency: This medication strictly requires adequate hydration to function safely. Forcing the bowel muscles to rapidly push a dry, hardened rock of stool through a dehydrated tract is incredibly painful. Subcutaneous fluids or heavily moistened meals are strictly required to ensure the stool is soft enough to be successfully pushed out.
Renal Clearance Note: Cisapride is primarily processed by the liver rather than the kidneys, making it a highly safe option for felines actively managing advanced chronic kidney disease.

Known Drug Interactions

The Heart Rhythm Risk: This medication was historically removed from the human market due to rare but severe heart rhythm interactions when mixed with specific drugs. It must be utilized with extreme caution if the cat is actively taking certain antifungals (like ketoconazole) or specific antibiotics (like erythromycin). The veterinary team must thoroughly review all current prescriptions before starting cisapride.

The Physical Blockage Danger (Specialized Header)

The Closed Door Risk: This medication must absolutely never be administered if a complete physical bowel obstruction is suspected. If a foreign object or an immovable mass of hardened stool is completely blocking the exit, forcing the intestines to powerfully push against a closed door can cause the bowel tissue to catastrophically tear or rupture. A veterinary x ray is frequently required before the very first dose is authorized.

What to Expect and When to Call the Vet

Mild Adjustments: Slightly looser stools or mild stomach gurgling are frequently noticed during the first few days as the digestive tract adjusts to the forced movement.
Emergency Red Flags: Immediate veterinary contact is required if the cat begins violently vomiting, exhibits extreme abdominal pain when touched, or produces severe, watery diarrhea. These are critical signs of an overdose, a severe cramping episode, or a potential bowel rupture.
Follow Up Lab Schedule: While specialized bloodwork is not required to monitor this specific drug, routine checkups are necessary to ensure the custom dose is still accurately managing the constipation without causing chronic diarrhea.

Medical Disclaimer

Important Note: This content is provided for informational and educational purposes only to support caretakers. It is not a substitute for professional veterinary advice, diagnosis, or treatment. Always listen to your veterinarian for exact dosing instructions and schedules. Never start, stop, or adjust your cat's medication without directly consulting your primary veterinary care team.

What Is It Called and How Is It Given?

Generic Name: Cisapride.
Brand Names: Propulsid was the historical human pharmacy brand. Today, it is strictly acquired through specialized veterinary compounding pharmacies.
Available Formats: Because it must be custom made by a compounder, this medication is typically formulated as a flavored oral liquid suspension, tiny capsules, or occasionally as a transdermal gel rubbed inside the ear tip.

Why Does My Cat Need This?

Plain English Goal: Cisapride is a powerful motility agent. Chronic, severe constipation caused by advanced kidney dehydration is aggressively managed by forcing the paralyzed or sluggish intestines to begin moving again. It is frequently utilized to treat a condition called megacolon, where the bowel becomes permanently stretched and weak.
Target Symptoms and Lab Markers: Severe straining in the litter box, producing small rock hard stools, chronic vomiting from backed up waste, and the total refusal to eat are directly targeted. Success is verified by caregivers observing the return of daily, comfortably passed, log shaped stools.
Response Window: Increased bowel movement and restored litter box habits are typically observed within twenty four to seventy two hours of starting the medication.

How It Works

The Conveyor Belt Engine: In plain English, the feline digestive tract operates exactly like a muscular conveyor belt. When severe constipation or megacolon occurs, the engine running that belt completely stalls out, leaving waste stranded in the colon. Cisapride acts as a direct electrical jump start for the gut. The specific nerve receptors inside the stomach and intestines are chemically triggered, commanding the muscles to powerfully contract and push the stranded waste toward the exit.

Tips for Giving the Dose

Food Rules and Flavor: The medication is highly recommended to be administered exactly fifteen to thirty minutes before a meal. Taking it before food actively turns the conveyor belt on just as the new meal is preparing to enter the stomach.
Compounding Guard: If a custom oral liquid is utilized, the bottle must be rigorously shaken before every single dose. Because the medication is suspended in the flavored syrup, the active drug will naturally sink to the bottom. If it is not shaken, the final doses in the bottle will be dangerously concentrated.
Missed Dose Protocol: If a dose is missed, the normal schedule should be resumed before the next meal. A double dose must never be given, as severe cramping can occur.

Important Hydration and Kidney Warnings

Hydration Dependency: This medication strictly requires adequate hydration to function safely. Forcing the bowel muscles to rapidly push a dry, hardened rock of stool through a dehydrated tract is incredibly painful. Subcutaneous fluids or heavily moistened meals are strictly required to ensure the stool is soft enough to be successfully pushed out.
Renal Clearance Note: Cisapride is primarily processed by the liver rather than the kidneys, making it a highly safe option for felines actively managing advanced chronic kidney disease.

Known Drug Interactions

The Heart Rhythm Risk: This medication was historically removed from the human market due to rare but severe heart rhythm interactions when mixed with specific drugs. It must be utilized with extreme caution if the cat is actively taking certain antifungals (like ketoconazole) or specific antibiotics (like erythromycin). The veterinary team must thoroughly review all current prescriptions before starting cisapride.

The Physical Blockage Danger (Specialized Header)

The Closed Door Risk: This medication must absolutely never be administered if a complete physical bowel obstruction is suspected. If a foreign object or an immovable mass of hardened stool is completely blocking the exit, forcing the intestines to powerfully push against a closed door can cause the bowel tissue to catastrophically tear or rupture. A veterinary x ray is frequently required before the very first dose is authorized.

What to Expect and When to Call the Vet

Mild Adjustments: Slightly looser stools or mild stomach gurgling are frequently noticed during the first few days as the digestive tract adjusts to the forced movement.
Emergency Red Flags: Immediate veterinary contact is required if the cat begins violently vomiting, exhibits extreme abdominal pain when touched, or produces severe, watery diarrhea. These are critical signs of an overdose, a severe cramping episode, or a potential bowel rupture.
Follow Up Lab Schedule: While specialized bloodwork is not required to monitor this specific drug, routine checkups are necessary to ensure the custom dose is still accurately managing the constipation without causing chronic diarrhea.

Medical Disclaimer

Important Note: This content is provided for informational and educational purposes only to support caretakers. It is not a substitute for professional veterinary advice, diagnosis, or treatment. Always listen to your veterinarian for exact dosing instructions and schedules. Never start, stop, or adjust your cat's medication without directly consulting your primary veterinary care team.