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Metacam Dosage Calculator — Cats
Estimate Metacam (meloxicam) doses for the first 24 hours (single injection) and the following oral treatment.
- First 24 h (single injection): typical dose = 0.2 mg/kg.
- Following days (oral): typical dose = 0.05 mg/kg every 24 h (up to 4 days).
Metacam Dosage Calculator for Cats: Safe Pain Management
| Primary Goal | Input Metrics | Output Result | Why Use This? |
| Prevent Overdose | Cat Weight (kg/lbs), Treatment Phase | Exact Dose (mg) & Volume (mL) | NSAID toxicity in cats is fatal. Precise dosing prevents renal failure. |
Understanding Feline Meloxicam
Metacam (active ingredient: Meloxicam) is a Non-Steroidal Anti-Inflammatory Drug (NSAID) engineered to inhibit COX-2 enzymes, thereby reducing prostaglandin production that causes pain and inflammation.
Unlike dogs or humans, cats have a reduced ability to metabolize NSAIDs due to a deficiency in the glucuronidation pathway in the liver. This makes the margin for error extremely narrow. A dose that is safe for a 5kg dog could cause acute kidney failure in a 5kg cat. This calculator standardizes the math to ensure you stay within the therapeutic window.
Who is this for?
- Post-Operative Owners: Managing pain after spaying, neutering, or orthopedic surgery.
- Senior Cat Owners: Treating chronic osteoarthritis or mobility issues.
- Veterinary Technicians: Double-checking calculations before administration.
- Foster Caregivers: Managing medication for rescue cats with acute injuries.
The Logic Vault
The calculation relies on a Weight-Based Dosing Protocol. There are two distinct phases: the “Loading Dose” (Day 1) and the “Maintenance Dose” (Day 2+).
The core equations are:
$$D_{total} = W_{cat} \times R_{dose}$$
$$V_{liquid} = \frac{D_{total}}{C_{drug}}$$
Variable Breakdown
| Variable | Name | Unit | Description |
| $D_{total}$ | Total Dosage | Milligrams (mg) | The active amount of Meloxicam required. |
| $W_{cat}$ | Cat Weight | Kilograms (kg) | The physical mass of the animal. |
| $R_{dose}$ | Dosage Rate | mg/kg | 0.1-0.2 (Loading) or 0.05 (Maintenance). |
| $C_{drug}$ | Concentration | mg/mL | Strength of the liquid. Standard Cat Oral is 0.5 mg/mL. |
| $V_{liquid}$ | Liquid Volume | Milliliters (mL) | The physical volume to draw into the syringe. |
Step-by-Step Interactive Example
Let’s calculate the Maintenance Dose (Day 2 onward) for “Luna,” a domestic shorthair cat.
Scenario:
- Weight ($W_{cat}$): Luna weighs 5 kg.
- Condition: Chronic Arthritis (Maintenance phase).
- Dosage Rate ($R_{dose}$): Standard maintenance is 0.05 mg/kg.
- Medication: Standard Metacam Oral Suspension for Cats (0.5 mg/mL).
The Calculation:
- Calculate Total Active Ingredient ($D_{total}$):$$5 text{ kg} times 0.05 text{ mg/kg} = 0.25 text{ mg}$$
- Calculate Liquid Volume ($V_{liquid}$):$$V_{liquid} = frac{0.25 text{ mg}}{0.5 text{ mg/mL}}$$
- Solve:$$V_{liquid} = 0.5 \text{ mL}$$
Result: You should administer 0.5 mL of the suspension to Luna.
Information Gain
A critical “Hidden Variable” that causes frequent emergency room visits is Concentration Confusion.
Metacam comes in two distinct concentrations:
- Dog Solution: 1.5 mg/mL
- Cat Solution: 0.5 mg/mL
The Expert Edge: Many owners try to save money by buying the “Dog” version and dosing it down. This is dangerous. The Dog solution is 300% more concentrated. If you use the Dog solution volume for a cat calculation without adjusting the math, you will overdose the cat by a factor of 3, likely causing acute renal necrosis. Always verify the bottle says 0.5 mg/mL.
Strategic Insight by Shahzad Raja
“Hydration is the silent variable in NSAID safety. Metacam restricts blood flow to the kidneys slightly. If your cat is dehydrated (common in older cats with kidney issues), this restriction can tip them into failure. Never dose a dehydrated cat. I recommend administering Metacam strictly with a wet food meal to ensure gastric lining protection and adequate hydration status during absorption.”
Frequently Asked Questions
What are the signs of Metacam overdose?
Early signs include vomiting (especially coffee-ground appearance indicating blood), loss of appetite, lethargy, and increased thirst/urination. If observed, stop medication immediately and contact a vet.
Can I give Metacam on an empty stomach?
No. Meloxicam inhibits prostaglandins that protect the stomach lining. Administering it on an empty stomach significantly increases the risk of gastric ulcers. Always give with or immediately after food.
How long does it take for Metacam to leave a cat’s system?
The half-life of Meloxicam in cats is approximately 24 hours. However, in cats with compromised kidneys, it can take significantly longer. A “washout period” of 5-7 days is usually required before switching to a different NSAID or steroid.
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