# Properties of an ATC code — atc_property • AMR (for R)
Gets data from the WHO to determine properties of an ATC (e.g. an antibiotic) like name, defined daily dose (DDD) or standard unit. This function requires an internet connection.

# Properties of an ATC code

`atc_property.Rd`

Gets data from the WHO to determine properties of an ATC (e.g. an antibiotic) like name, defined daily dose (DDD) or standard unit.
This function requires an internet connection.

    atc_property(atc_code, property, administration = "O",
      url = "https://www.whocc.no/atc_ddd_index/?code=%s&showdescription=no")

    atc_groups(atc_code, ...)

    atc_ddd(atc_code, ...)

## Arguments

atc_code | a character or character vector with ATC code(s) of antibiotic(s)
property | property of an ATC code. Valid values are `"ATC"`, `"Name"`, `"DDD"`, `"U"` (`"unit"`), `"Adm.R"`, `"Note"` and `groups`. For this last option, all hierarchical groups of an ATC code will be returned, see Examples.
administration | type of administration when using `property = "Adm.R"`, see Details
url | url of website of the WHO. The sign `%s` can be used as a placeholder for ATC codes.
... | parameters to pass on to `atc_property`

## Source

https://www.whocc.no/atc_ddd_alterations__cumulative/ddd_alterations/abbrevations/

## Details

Options for parameter `administration`:

- `"Implant"` = Implant

- `"Inhal"` = Inhalation

- `"Instill"` = Instillation

- `"N"` = nasal

- `"O"` = oral

- `"P"` = parenteral

- `"R"` = rectal

- `"SL"` = sublingual/buccal

- `"TD"` = transdermal

- `"V"` = vaginal

Abbreviations of return values when using `property = "U"` (unit):

- `"g"` = gram

- `"mg"` = milligram

- `"mcg"` = microgram

- `"U"` = unit

- `"TU"` = thousand units

- `"MU"` = million units

- `"mmol"` = millimole

- `"ml"` = milliliter (e.g. eyedrops)

## Examples

    # NOT RUN {
    # What's the ATC of amoxicillin?
    guess_atc("Amoxicillin")
    # [1] "J01CA04"

    # oral DDD (Defined Daily Dose) of amoxicillin
    atc_property("J01CA04", "DDD", "O")
    # parenteral DDD (Defined Daily Dose) of amoxicillin
    atc_property("J01CA04", "DDD", "P")

    atc_property("J01CA04", property = "groups") # search hierarchical groups of amoxicillin
    # [1] "ANTIINFECTIVES FOR SYSTEMIC USE"
    # [2] "ANTIBACTERIALS FOR SYSTEMIC USE"
    # [3] "BETA-LACTAM ANTIBACTERIALS, PENICILLINS"
    # [4] "Penicillins with extended spectrum"
    # }