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We have a dog who is on pimobendan, and our other dog who is about 13 pounds accidentally got .625 mg of it.

Will he be okay??

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    you need to call your vet about this,heart medication might be dangerous.wellcome to pets.se. – trond hansen Jul 6 '18 at 4:45
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You should always call your vet as soon as possible when something like this happens. By the time someone on the internet answers, if it was a problem it will likely have resulted in serious effect by now.

That being said, 0.625 mg of pimobendan is even a low dose for a 13 lb dog (roughly 0.1 mg/kg). Typical therapeutic doses range from 0.2 to 0.5 mg/kg per day (per Plumbs Veterinary Drugs).

Toxicity is therefore not a concern at such low dose.

In all likelihood, it will not be a problem. Pimobendan works to increase heart contractility, and in a healthy dog a single low dose will not be a problem. The concern comes if your dog has heart disease or other conditions which may make reaction to the drug less predictable.

Close monitoring for 24 hours is a reasonable option in such a case; if any doubts or concerns then immediate evaluation by a veterinarian is needed.

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