Calactodryl

Calamine has mild astringent and antipruritic actions. Calamine is an anti-itch medication that works by causing a cooling sensation as it evaporates on your skin.

Diphenhydramine is an antihistaminic medication. It blocks the action of certain chemical messengers that are responsible for inflammation, congestion, itching, and other allergic reactions.

Camphor belongs to the class of medicines called rubefacients/antitussives. When applied to the skin, it increases blood flow and local temperature of the affected area which suppresses and temporarily relieves pain sensations. It also eases cough, nasal/throat irritation by moistening air passages when used along with steam.