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Hello, my name is***** Can you provide me the weight of your dog and the dosage he ate?
Ok, give me just a second, I'm checking my formulary to see if we need to have you induce vomiting at home. How long ago did he eat it?
Do you have hydrogen peroxide? While it seems to have a wide safety margin, it would be best to get it out of his system if possible. You would give 2 teaspoons by mouth once.
Symptoms in dogs are lethargy, decreased breathing rate and increased heart rate. Most of the recommendations include IV fluids and monitoring if the symptoms are severe.
I would still induce vomiting, on the off chance there is some pill left in his system to absorb. You will need to keep a close eye on him and watch for low breathing rate (less than 10 breaths per minute) and lethargy. Everything I have read indicates that they can have effects for 24-48 hours.
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Unfortunately, there is nothing you can give at home to reverse or counter the effects. In a clinic setting, there are prescription meds that can be given to counter-act the symptoms if needed and then the IV fluids to quickly flush the system.
Is he exhibiting any symptoms right now?
In humans, they have found that there are no major adverse events when taking up to 4,000 mg (that does not mean do that! It just means that people have tried to overdose on their pills and survived with very little harm).
At this point, I would monitor him. If he was going to have symptoms, he should be starting to show them soon. Those symptoms would be extreme lethargy (some dogs can exhibit a reverse reaction and be exceptionally hyper/agitated/anxious), a low breathing rate (less than 10 breaths per minute).
If he exhibits these symptoms, then I would recommend a visit to the ER. I am hopeful, given that he is still acting normal, that he will not exhibit any signs or if he does, they will be very mild and you can ride them out at home.
It seems the peak effect is the first 12 hours, then it tapers off from there. If he is fine in the next 12 hours, it seems you should be ok.
Do you have any further questions? Any new symptoms develop?