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UMC (726 words) |
 | The Anatomical Therapeutic Chemical (ATC) is a classification system in which drugs are divided into different groups according to the organ or system on which they act, and their chemical, pharmacological and therapeutic properties. |
| Substances classified in the same ATC 4th level cannot be considered pharmacotherapeutically equivalent, since their mode of action, therapeutic effect, drug interactions and adverse drug reaction profile may differ. |
| Alterations in ATC classification are made when the main use of a drug has clearly changed, and when new groups are required to accommodate new substances or to achieve better specificity in the groupings. |
| (FMRC) - ATC : Structrure (238 words) |
| ATC codes are alphanumerical and use 7 positions. |
| A substance can be given more than one ATC code if it is available in two or more strengths or formulations with clearly different therapeutic uses. |
| The principles of classification are further described in the guidelines to ATC classification (1). |
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