Write the therapeutic action of following on human body and mention the class of drugs to which each of these belong :
(i) Ranitidine (ii) Morphine (iii) Aspirin

Explanation

(i) Ranitidine : It hinders the interaction of histamine with the receptors present in stomach wall due to that less HCl is released and hyperacidity problem is solved. It belongs to Antacid drugs.
(ii) Morphine : They are used for the relief of post operative pain, cardiac pain, pains of terminal cancer and in child birth. They belong to Narcotic analgesics (addictive).
(iii) Aspirin : It inhibits the synthesis of prostaglandin which stimulate inflammation in tissues and cause pain.
It is effective in relieving skeletal pain due to arthritis, prevents blood platelet coagulation. It belongs to non-narcotic analgesics (non-addictive).