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PetDosageChart

Selective serotonin reuptake inhibitor (SSRI) · For Cats · 18 lb

How much Prozac for a 18 lb cat?

A 18 lb cat (8.2 kg) should receive approximately 6.1 mg of Prozac per dose, given once daily.

This dosage information is for educational purposes only. Always consult your veterinarian before giving any medication to your pet. Dosages may vary based on your pet's health conditions, other medications, and individual factors.

Content reviewed by licensed veterinarians. Sourced from Plumb's Veterinary Drug Handbook and the Merck Veterinary Manual.

Dosage · 18 lb cat

Prozac dose for a 18 lb cat

Low Dose

4.1

mg

Standard

6.1

mg

Max Safe

8.2

mg

Frequency

once daily

Weight in kg

8.2 kg

Always confirm with your veterinarian before administering medication. These calculations are estimates based on published veterinary pharmacology references.

Other Weights

Prozac for a different size cat

FAQ · 18 lb cat

Questions about Prozac for a 18 lb cat

How much Prozac for a 18 lb cat?
A 18 lb cat should receive approximately 6.1 mg of Prozac (Fluoxetine) per dose, given once daily. That works out to about 0.5 × 10 mg. Always confirm with your veterinarian before administering medication.
What is the safe dose range of Prozac for a 18 lb cat?
The published dose range for a 18 lb cat is roughly 4.1 mg (low) to 8.2 mg (max safe), with 6.1 mg as the typical standard dose. Frequency: once daily.
How often can I give Prozac to a 18 lb cat?
Prozac is typically given once daily. Do not exceed the recommended frequency without veterinary guidance.

Need a different weight?

Use the calculator on the main Prozac page for any exact weight, or read the full dosage chart and safety information.

Full Prozac dosage guide →

Sources · 09

Sources & references

The dosage information on this page is compiled from the following veterinary and pharmaceutical references:

  • Plumb's Veterinary Drug Handbook — the standard veterinary pharmacology reference used by veterinarians worldwide.
  • Merck Veterinary Manual — a trusted, peer-reviewed resource for veterinary professionals and pet owners.
  • DailyMed (FDA Drug Labels) — official FDA-approved drug labeling and prescribing information for Fluoxetine.

Read more about our methodology and how we calculate dosages.