Chemistry

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Antihistamines are the drugs which control the allergy effects produced by histamines. Antacids are the substances which neutralise gastric acidity. Antihistamine do not affect the secretion of acid in stomach and the reason is that both antiallergic and antacid drugs work on different receptors.

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Aspirin prevents platelet coagulation and thus has antiblood clothing action, therefore, can prevent blood clotting in heart.

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Tranquilizers are used in sleeping pills.

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Antibiotic, arsphenamine possesses -As = As – linkage that resembles -N =N – linkages in azo dyes.

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Ionic bonding, hydrogen bonding, van there Waals interaction, dipole-dipole interaction, etc., are involved in binding.

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Sites different from active site of enzyme where a molecule can bind and affect the active site is called allosteric site. Some drugs may also bind at this site.

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Hyperacidity in the intestine creates ulcer, gastric reflux and oesophagitis.

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Receptors are embedded on the outer surface of the cell membrane.

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Antiseptics, antibiotics, disinfectants and sulpha drugs come under antimicrobial drugs.

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Antiseptics are chemicals which either kill or prevent the growth of micro-organisms and are applied to the living human tissues.