Ok, here's what Adam's Lameness says:
Nitroglycerin ointment applied topically to the pastern region subjectively reduced bounding pulses and lameness in ponies. 2% glycerly trinitrate ointment (GTN) was applied once daily to the pasterns (clip hair) as a patch; each aliquot (1 inch bead) of paste was positioned over the digital vessels and secured in place with elastic adhesive tape. GTN was administered at an initial dose of 60 mg for 2 days. If the blood pressure decreased and the lameness improved, it was reduced to 40 mg for 2 days and then to 20 mg for an additional 2 days. Because GTN ointment is readily absorbed through the skin, it is advisable to use rubber gloves when applying it. At the time of this writing, GTN is being used routinely in clinical cases, but usually in conjuction with other treatments; therefore, accurate assessment of therapeutic effects are not clear.
Ok, this is me talking. The only thing I did with George was the nitro patch and IV Banamine.
Does it mention the timing in that description? Perhaps it is after the initial acute phase and icing? To speed recovery in the secondary phase of it?