Antihistamine
Zyrtec Dosage for Cats
Calculate the safe Zyrtec (Cetirizine) dose for your cat based on weight. Adjust the slider below for instant results.
Quick Calculator
lbs
1 lb30 lbs
About Zyrtec for Cats
Zyrtec (generic name: Cetirizine) is an over-the-counter medication in the Antihistamine category. It is commonly used for cats to treat:
- Allergies
- Itchiness
- Seasonal allergies
- Environmental allergies
Dosing Notes
Flat dose: 5 mg once daily regardless of weight.
Warnings & Contraindications
Warnings
- Use only plain cetirizine — avoid Zyrtec-D which contains pseudoephedrine (toxic to pets)
- Less sedating than Benadryl
Do NOT Use If
- Do NOT use Zyrtec-D (contains pseudoephedrine, which is toxic)
Important Notes
- Dogs: max 20 mg per day
- Cats: flat 5 mg dose regardless of size
Zyrtec Dosage Chart for Cats
| Weight | Dose (mg) | Frequency |
|---|---|---|
| 4 lbs | 5 mg | Once daily |
| 6 lbs | 5 mg | Once daily |
| 8 lbs | 5 mg | Once daily |
| 10 lbs | 5 mg | Once daily |
| 12 lbs | 5 mg | Once daily |
| 15 lbs | 5 mg | Once daily |
| 20 lbs | 5 mg | Once daily |
10 lb Cat
Zyrtec Dose
Generally safe for cats at this dose
5mg
💊
Tablet Form
1/2 of a 10 mg tablet OR 1 whole 5 mg tablet
🕐
Frequency
Once daily
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All 8 medications in one tool
Always consult your veterinarian before giving any medication to your pet. These dosages are general guidelines. Individual pets may require different dosing.