Ondansetrin 4 mg Tablets

Ondansetron 4 mg tablets are prescription antiemetic tablets used in cats to control nausea and vomiting caused by illness, surgery, chemotherapy, kidney disease, or gastrointestinal disorders.  It works by blocking serotonin receptors involved in the vomiting reflex and is commonly prescribed when persistent nausea requires targeted control.

⚠️ Veterinary prescription required.

What This Medication Is Used For

Your veterinarian may prescribe Ondansetron for:

• Acute or chronic vomiting
• Chemotherapy-induced nausea
• Post-operative nausea
• Chronic kidney disease (uremic nausea)
• Gastritis or inflammatory bowel disease
• Liver disease-associated vomiting
• Refractory vomiting not controlled by other medications

It manages symptoms. Proper diagnosis of the underlying cause is essential.

How Ondansetron Works

Ondansetron is a selective 5-HT3 (serotonin) receptor antagonist.

In cats:

• Serotonin plays a major role in triggering vomiting.
• Ondansetron blocks serotonin receptors in:
  • The vagal nerve
  • The chemoreceptor trigger zone (CTZ)
  • The brainstem vomiting center

This prevents nausea signals from reaching the brain.

Unlike older antiemetics, it is non-sedating in most feline patients.

Key Clinical Benefits

• Rapid onset (30–60 minutes orally)
• Controls serotonin-mediated vomiting
• Non-sedating profile
• Suitable for acute and chronic use (under monitoring)
• Frequently used in oncology and CKD cases
• Can be combined with maropitant when indicated

Recommended Dosage (Veterinary Guidance Required)

Standard feline oral dosing range:

0.1–0.5 mg per kg every 8–12 hours

Weight-Based Reference Guide

⚠️ Always follow your veterinarian’s prescribed dose.

Tablets may need accurate splitting or compounding.

Duration of Treatment

• Acute vomiting: Often 2–5 days
• Chronic conditions (CKD, IBD, oncology): Long-term use may be prescribed under monitoring
  

Do not discontinue long-term therapy without veterinary advice.

How to Administer

• May be given with or without food
• Use a pill cutter for accurate dosing
• Compounded flavored liquids may be available
• Give at consistent intervals

If vomiting continues despite dosing, contact your veterinarian.

Safety & Monitoring

Ondansetron is generally well tolerated in cats.

Use Caution In:

• Liver disease (dose adjustment may be required)
• Elderly cats
• Cats on serotonergic medications
• Cats with cardiac rhythm disorders

Possible Side Effects

Most side effects are mild and temporary.

Common:

• Mild lethargy
• Constipation
• Drooling (tablet bitterness)

Rare:

• Agitation
• Head shaking
• Behavioral changes

Seek veterinary care immediately if:

• Severe weakness occurs
• Persistent vomiting continues
• Overdose is suspected
• Allergic signs appear (facial swelling, difficulty breathing
  

Drug Interactions

Use caution if your cat is receiving:

• Tramadol
• SSRIs
• Other serotonergic medications
• CNS depressants
• Apomorphine

Always inform your veterinarian about all medications and supplements.

Product Information

FAQ

What is Ondansetron used for in cats?
It is used to control nausea and vomiting caused by kidney disease, chemotherapy, surgery, or gastrointestinal disorders.

How fast does Ondansetron work in cats?
Effects are typically seen within 30–60 minutes after oral administration.

Can Ondansetron be used long term?
Yes, under veterinary supervision, particularly in chronic kidney disease or oncology cases.

Is Ondansetron sedating for cats?
No, it is generally non-sedating at recommended doses.