A. Although lisinopril is used in vet medicine, I would expect that this dose (about 30 mg/kg) would cause some hypotension (low blood pressure). If it's been less than an hour and a half or so since ingestion it would likely be productive to induce vomiting at the vet. Regardless, I'd recommend taking him in for a blood pressure check. It could fall significantly lower, and he might need fluid support to make it thorough the crisis.
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