Antiemetic justs means an anti-vomiting medication. There are several that could have been administered. Here's a list that shows the mg dosage per kilogram (which is 2.2 pounds). You can't tell which drug and how much was given by your invoice. To further complicate the matter, these are the generic names. For instance Reglan (which is a common one you hear of) is Metoclopramide. See this site for overdose symptoms.
http://a1272.g.akamai.net/7/1272/112...clopramide.pdf
Don't know what the IM in the second injection abbreviation mean. I do think it is possible that an overdose or reaction caused a seizure. Did the 2nd vet know what the first vet had given?
TABLE 04: Antiemetic Drugs
Drug Dosage
Acepromazine 0.025-0.2 mg/kg, IV, IM, SC, maximum 3 mg; 1-3 mg/kg, PO
Chlorpromazine 0.5 mg/kg, IV, IM, SC, tid-qid
Prochlorperazine 0.1 mg/kg, IM, tid-qid; 1 mg/kg, PO, bid
Isopropamide 0.2-1.0 mg/kg, PO, bid
Propantheline 0.25 mg/kg, PO, tid
Dimenhydrinate 4-8 mg/kg, PO, tid
Diphenhydramine 2-4 mg/kg, PO, tid
Cyclizine 4 mg/kg, PO, tid
Meclizine 4 mg/kg, PO, sid
Butorphanol 0.2-0.4 mg/kg, IM, sid-bid
Metoclopramide 0.1-0.5 mg/kg, IM, SC, or PO, tid; 0.01-0.02 mg/kg/hr, IV infusion
Ondansetron 0.1-0.2 mg/kg, PO, sid-bid ; 0.22 mg/kg, IV, bid-tid
Dolasetron 0.6 mg/kg, IV, sid
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