Most drugs act at cellular level by binding to receptor surface of cell membrane or inside cells, the cell membrane contains receptor for many kinds of substances such as hormones and neural transmittors. Some receptors also interact with drug molecules, as a drug molecule binds to the receptor it inhibits regular cellular functions; one type of reaction activates, deactivates or alters the intra cellular enzymes. Enzymes catalize almost all cellular functions, therefore drug-induced alterations can greatly increase or decrease rate of cellular metabolism.
Most drugs act at cellular level by binding to receptor surface of cell membrane or inside cells, the cell membrane contains receptor for many kinds of substances such as hormones and neural transmittors. Some receptors also interact with drug molecules, as a drug molecule binds to the receptor it inhibits regular cellular functions; one type of reaction activates, deactivates or alters the intra cellular enzymes. Enzymes catalize almost all cellular functions, therefore drug-induced alterations can greatly increase or decrease rate of cellular metabolism.
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