Class 12 Chemistry Chemistry In Everyday Life Classification of drugs

Classification of drugs

  • On the basis of pharmacological effect
  • On the basis of drug action
  • On the basis of chemical structure
  • On the basis of molecular targets


Pharmacological effect

  • This classification is based on pharmacological effect of the drugs.
  • It is useful for doctors because it provides them the whole range of drugs available for the treatment of a particular type of problem.
    • For example, analgesics have pain killing effect; antiseptics kill or arrest the growth of microorganisms.

 Drug Action

  • It is based on the action of a drug on a particular biochemical process.
  • For example, all antihistamines inhibit the action of the compound, histamine which causes inflammation in the body. There are various ways in which action of histamines can be blocked.
  • Aspirin controls the synthesis of chemicals known as prostaglandins


Chemical Structure

  • It is based on the chemical structure of the drug.
  • Drugs classified in this way share common structural features and often have similar pharmacological activity.
  • For example, sulphonamides have common structural feature, given below.


Molecular targets

  • Drugs usually interact with biomolecules such as carbohydrates, lipids, proteins and nucleic acids.
  • These are called target molecules or drug targets.
  • Drugs possessing some common structural features may have the same mechanism of action on targets.


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