i) Analgesics – Drugs which reduce or abolish pain without causing impairment of conciousness, mental confusion, incoordination or paralysis or some other disturbances of nervous system.
ii) Antibiotics – Drugs used to treat infections because of their low toxicity for humans and animals. These are substances produced wholly or partly by chemical synthesis, which in low concentrations inhibit the growth or destroy microorganisms by intervening in their metabolic processes.
iii) Tranquilizers – These are neurologically active drugs which affect the message transfer mechanim from nerve to receptor. These are used forthe treatment of stress, and mild or even severe mental diseases. These relieve anxiety, stress, irritability or excitment by inducing a sense of well-being.
