Veterinary Drug Handbook (VDH) is the reference veterinarians turn to when they want an independent source of information on the drugs that are used in veterinary medicine today.


Chemical used as a messenger from one nerve cell to another. A substance released from a neuron of the central or peripheral nervous which excites or inhibit the target cell. Examples include: acetylcholine, norepinephrine, epinephrine, dopamine, substance P, enkephalins, endorphins and serotonin.

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