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VARIETIES OF DRUGS: A drug can have three varieties of names. They are 1. Chemical name, 2. Generic or official name and 3. Brand (trade or proprietary) name. Chemical name is the chemical formula of the drug. This is useful for the chemist because it shows the structure of the drug. The chemical formula may be long and complicated. Generic or official name may be recognized as identifying the drug for legal and scientific purposes. This name becomes public property by the original manfacturer and any drug manufacturer may use it thereafter.The generic name for each drug is only one. Brand name (trade or proprietary) is the private property for individual drug manufacturer. This is a registered trade name. When a particular brand name is ordered on a prescription by a physician, it must be dispensed by the pharmacist; no other brand name may be substituted. The chemical name of ampicilin is 'derivative of 6-aminopenicillanic acid'. The generic name of ampic

SUBDIVISIONS OF PHARMACOLOGY: In the previous lesson we came to know about the drugs, pharmacology and their subdivisions  In this lesson we come to know more about the various subdivisions. 1. Medicinal chemistry:- It is the study of synthesis of new drug and the relationship between chemical structure and biological effects. 2. Pharmacodynamics:- It involves the study of drug effects in the body i.e, 'Drug absorption' (how drugs pass into the blood stream), 'Metabolism' (changes drugs undergo within the body), and 'Excretion' (removal of the drug from the body). 3. Pharmocokinetics:- It explains the appearance and disappearance of the drug in the body overtime. 4. Molecular pharmacology:- It is the study of the interaction of the drugs and subcellar entities such as DNA, RNA and enzymes. 5. Chemotherapy:- It defines the study of drugs that destroy microorganisms, parasites, or malignant cells within the body. It also includes the treatme

PHARMACOLOGY: Let us come to know about the introduction of Drugs in this chapter Introduction:- 1. Drugs are the substances which are used for the prevention or treatment of diseases in a comfortable condition for our human body. 2. Drugs are classified into two types. They are biological and chemical substances. (I) Biological Drugs:- 1. These drugs are obtained from plants, such as the roots, leaves and fruit. Examples of these drugs are digitalis (from the foxglove plant) and antibiotics such as pencillin and streptomycin (from lower plants called molds). 2. These drugs are also obtained from animals Examples of these drugs are hormones are secretions from the glands of animals. (II) Chemical Drugs:- 1. These drugs are syntesized in the laboratory. Examples of these drugs are Anticancer drugs, such as methotrexate and prednisone, 2. These drugs are also contained in food substances called vitamins. Examples of these drugs are vitamin B12. "Drugs