My dog ate Zofran (Ondansetron). Is this dangerous? Should I go to ER?

Question

My 7.5lb dog just ate/swallow 1 1/5 pills of dissolvable ondasteron (zofran) which equals to about 6mg. It was for my other dog and he ran up and snatched it in a treat. He already had 1/2 a pill (=2mg) 6 hours ago. Is this dangerous/should we bring him to the ER? Or will he be okay??? I’m worried. Pet's info: Dog | Yorkshire Terrier | Male | neutered | 7 years and 11 months old | 8.3 lbs

Andrea M. Brodie, DVM · Accepted Answer

Ondansetron (Zofran) can cause constipation and atrial fibrillation even at normal doses. A normal dose would be 0.5mg to 1mg/kg twice daily, so your dog clearly got an overdose. This may be detrimental, but possibly also not. You should take Cash to a Pet ER for inducing emesis (vomiting) or you can also call the pet poison line for advice: 24/7 Animal Poison Control Center 855-764-7661 $59 USD per incident fee applies

My dog ate Zofran (Ondansetron). Is this dangerous? Should I go to ER?

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