Abstract
Intrathecally-administered clonidine inhibited the spontaneous firing of single neurons in the pontine nucleus locus coeruleus of rats. Such inhibition of neuron firing was not observed when the non-lipophilic α 2 adrenoceptor agonist (oxymetazoline) was administered intrathecally. It is concluded that lipophilic drugs like clonidine, when administered intrathecally, can have profound supraspinal actions and thus caution should be exercised in interpreting the sites of action of such drugs.
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