The most common drugs, hormones, supplements, and herbs for horses are described and evaluated in this updated edition of a long-trusted guide. New products have been added to the A-to-Z guide, obsolete items have been removed, and the entries have been revised to reflect new scientific findings. Each listing gives indicated uses, ingredients, proper administration, and side effects. An index of brand names is included to simplify the cross-referencing of generics and related medications.