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.


Stopping the communications between certain nerves and muscles of the body including those of the gastrointestinal tract and heart. These nerves are called 'parasympathetic' nerves and do such things as constrict the pupils of the eye, stimulate contractions of the muscles in the intestine, and slow the heart rate. Anticholinergic drugs would have the effect, then, of dilating the pupil, slowing contractions of the intestines and increasing the heart rate.

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