Thank you for the opportunity to help you with your question!
Each steed, Ace responds in an unexpected way. I have just about the same circumstance because of colic surgery. Once b4 this all happened, I gave my steed (about the same weight as yours) 1/2cc pro in the mouth (doesnt do shots without a vet) b4 riding. NO change by any stretch of the imagination. I thought Id see a touch of response, such as having maybe a couple lagers, yet no. B4 turnout, my vet said when giving by mouth normally u require a more grounded dosage so I controlled 1cc into the back of her throat. Held up 30-40 minutes while in slow down. At that point turned her out. She was incredible. Still ran a bit, jog to jogged delicately, pursued the other stallion, yet everything was delicate and not fierce kicking or gnawing, nor screeching. At that point in a split second delighted in the enormous enclosure brushing.
I say everything with some restraint. On the off chance that he is ordinarily a HOT TB, & your vet knows him, listen to the vet. Be that as it may, to blunder in favor of alert, perhaps Id give him a bit under 2cc of what the vet recommended. On the off chance that he has attempted to pull far from you handwalking or when another stallion shouts or spooks and is acting HOT, u know he'll be blazing elastic when u turn him lose & may require that much 2cc. Good fortunes.
Please let me know if you need any clarification. I'm always happy to answer your questions.
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