a. Central nervous system stimulants excite the nerve cells of the central nervous system. These agents are classified according to their main site of action and their primary pharmacological effects. Following are the three categories of agents:
(1) Cerebral of psychomotor agents.
(2) Analeptics (brain stem stimulants).
(3) Convulsants (spinal cord stimulants).
b. As you might anticipate, when increasingly larger doses of a drug are administered to the patient, the effects produced by the drug cause stimulation of more than one area.
c. Some central nervous system stimulants produce high levels of stimulation at other sites in the body (for example, the heart). In some cases, the usefulness of several CNS agents is limited because of the stimulation they produce in body organs.
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