ATC and DDD Classification System

**Overview**
This data package contain information of ATC (Anatomical Therapeutic Chemical) classification system. The Anatomical Therapeutic Chemical (ATC) Classification System is used for the classification of active ingredients of drugs according to the organ or system on which they act and their therapeutic, pharmacological and chemical properties. It is controlled by the World Health Organization Collaborating Centre for Drug Statistics Methodology (WHOCC), and was first published in 1976.

**Description**
The ATC (Anatomical Therapeutic Chemical) classification system divides drugs into different groups according to the organ or system on which they act, their therapeutic intent or nature, and the drug's chemical characteristics. Different brands share the same code if they have the same active substance and indications. Each bottom-level ATC code stands for a pharmaceutically used substance, or a combination of substances, in a single indication (or use). This means that one drug can have more than one code, for example acetylsalicylic acid (aspirin) has A01AD05 (WHO) as a drug for local oral treatment, B01AC06 (WHO) as a platelet inhibitor, and N02BA01 (WHO) as an analgesic and antipyretic); as well as one code can represent more than one active ingredient, for example C09BB04 (WHO) is the combination of perindopril with amlodipine, two active ingredients that have their own codes (C09AA04 (WHO) and C08CA01 (WHO) respectively) when prescribed alone.
The ATC classification system is a strict hierarchy, meaning that each code necessarily has one and only one parent code, except for the 14 codes at the topmost level which have no parents. The codes are semantic identifiers, meaning they depict in themselves the complete lineage of parenthood.

**Benefits**
- Useful data package as the anatomical therapeutic chemical (atc) classification system is used for the classification of active ingredients of drugs according to the organ or system on which they act and their therapeutic, pharmacological and chemical properties.

**License Information**
The use of John Snow Labs datasets is free for personal and research purposes. For commercial use please subscribe to the [Data Library](https://www.johnsnowlabs.com/marketplace/) on John Snow Labs website. The subscription will allow you to use all John Snow Labs datasets and data packages for commercial purposes.

**Included Datasets**
- [Anatomical Therapeutic Chemical Alterations 2005 to 2022](https://www.johnsnowlabs.com/marketplace/anatomical-therapeutic-chemical-alterations-2005-to-2022)
- This dataset contains the ATC (Anatomical Therapeutic Chemical) Alterations from 2005 to 2022.
- [Anatomical Therapeutic Chemical Codes 2018 to 2023](https://www.johnsnowlabs.com/marketplace/anatomical-therapeutic-chemical-codes-2018-to-2023)
- This dataset contains the Anatomical Therapeutic Chemical (ATC) classification system. In ATC the active substances are divided into different groups according to the organ or system on which they act and their therapeutic, pharmacological and chemical properties.
- [Defined Daily Dose Alterations 2005 to 2021](https://www.johnsnowlabs.com/marketplace/defined-daily-dose-alterations-2005-to-2021)
- This dataset contains the DDD (Defined Daily Dose) Alterations from 2005 to 2021.
- [Defined Daily Dose Codes for 2018 to 2023](https://www.johnsnowlabs.com/marketplace/defined-daily-dose-codes-for-2018-to-2023)
- This dataset contains the Defined Daily Dose (DDD) 2018 to 2023. In order to measure drug use, it is important to have both a classification system and a unit of measurement. To deal with the objections against traditional units of measurement, a technical unit of measurement called the Defined Daily Dose (DDD) to be used in drug utilization studies was developed.

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