Explain neurologically active drugs.

(N/A) Neurologically active drugs are classified into two main types: $(a)$ Tranquilizers and $(b)$ Analgesics.
$(a)$ Tranquilizers: These are a class of chemical compounds used for the treatment of stress,and mild or even severe mental diseases. They relieve anxiety,stress,irritability,or excitement by inducing a sense of well-being. They are essential components of sleeping pills.
There are various types of tranquilizers that function through different mechanisms. For example,noradrenaline is a neurotransmitter that plays a role in mood changes. If the level of noradrenaline is low,the signal-sending activity becomes low,and the person suffers from depression. In such situations,antidepressant drugs are required.
These drugs inhibit the enzymes that catalyze the degradation of noradrenaline. By inhibiting the enzyme,this neurotransmitter is metabolized more slowly and can activate its receptor for a longer period,thus counteracting depression. Iproniazid and phenelzine are examples of such drugs.
Some tranquilizers,such as chlordiazepoxide and meprobamate,are relatively mild and suitable for relieving tension. Equanil is used in controlling depression and hypertension.