D.W. Ramey, DVM. Howell Bookhouse
New York, NY, 1996. Re-issued and updated as Concise Guide to Medications, Herbs, and Supplements for the Horse, Trafalgar Square Publishing, North Pomfret, VT, 2007.
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This book has always done well. It gives you a good bit of information about a whole bunch of medications, herbs, and supplements that you might be inclined to put in your horse. You might be surprised what you find out!