Were it me, and I don't own horses, I would consider giving him some aspirin to thin the blood a little (better circulation) ease any swelling (stiffness from being down so long), and ease pain to help him move a bit more readily. When I researched it I come up with this:
"what is the dose (in human MG tablets) for a 1,000 pound horse... it is about two to four 240 GRAIN BOLUSES... how many 325 MG aspirins does it take to equal 240 or 480 grain boluses? A grain is equal to 64.799 milligrams, so a 240 grain bolus is equal to 15551.76 milligrams. So of your human aspirin you would be dosing 47.85 human aspirins."
I wouldn't try to get that many down his throat but might try to get him to eat 10-20. Maybe dissolved in warm sugar/molasses water that he might drink?
from: http://myhorseforum.com/threads/human-aspirin-doses-aligned-to-horse-dose.149325/
"what is the dose (in human MG tablets) for a 1,000 pound horse... it is about two to four 240 GRAIN BOLUSES... how many 325 MG aspirins does it take to equal 240 or 480 grain boluses? A grain is equal to 64.799 milligrams, so a 240 grain bolus is equal to 15551.76 milligrams. So of your human aspirin you would be dosing 47.85 human aspirins."
I wouldn't try to get that many down his throat but might try to get him to eat 10-20. Maybe dissolved in warm sugar/molasses water that he might drink?
from: http://myhorseforum.com/threads/human-aspirin-doses-aligned-to-horse-dose.149325/