Published dose range
The published veterinary reference range for chlorpheniramine in dogs is 0.2-0.4 mg per kg of body weight, given every 8-12h.
Source: Merck Veterinary Manual →Published range by weight
| Weight | Chlorpheniramine (published range) |
|---|---|
| 5 lb dog | 0.5-0.9 mg |
| 10 lb dog | 0.9-1.8 mg |
| 20 lb dog | 1.8-3.6 mg |
| 30 lb dog | 2.7-5.4 mg |
| 40 lb dog | 3.6-7.3 mg |
| 50 lb dog | 4.5-9.1 mg |
| 60 lb dog | 5.4-11 mg |
| 80 lb dog | 7.3-15 mg |
| 100 lb dog | 9.1-18 mg |
Computed from the published 0.2-0.4 mg/kg reference range, every 8-12h. Product strengths rarely split evenly, so round DOWN to the nearest practical dose and confirm with your vet.
Sedation common.
Skip it or ask a vet first if
glaucomaurinary obstruction
If you think you overdosed
Call the Pet Poison Helpline: 855-764-7661 or ASPCA Poison Control: 888-426-4435. Both are staffed 24/7 by veterinary toxicologists.