Thank you for submitting your question. Vetsulin contains insulin. 10cc of Vetsulin contains approximately 400U of insulin, which is a very high dose.
This person should seek medical attention immediately. This dose of insulin can lower his/her blood glucose to a dangerous level. He/she should start drinking sweetned juice( add 3-4 tablespoon of sugar in regular juice). Taking in sugar alone may not be able enough. He/she may need IV glucose and close monitoring.
Again, my advice is to seek medical attention immediately. Low blood glucose can be lethal.