Define the following terms :
(a) Tranquilizers
(b) Ant-acids
(c) Analgesics
(a) Tranquilizers :
Tranquilizers are chemical substances used to cure mental diseases, reduce anxiety and are important constituent of sleeping pills.
(b) Antacids :
Antacids are substances which remove excess acid and raise the pH to appropriate level in stomach.
(c) Analgesics :
Analgesics are drugs which reduce or abolish pain without reducing consciousness, incoordination or other disturbances of the nervous system.