What is Oxygen therapy?
{{Infobox drug | drug_name = | INN = | type =<!-- empty --> | IUPAC_name = | image = Simple face mask.jpg | width = 250px | alt = | caption = A person wearing a simple face mask <!-- Clinical data --> | synonyms = supplemental oxygen, enriched air | pronounce = | tradename = | Drugs.com = {{Drugs.com|pro|oxygen}} | MedlinePlus = | pregnancy_AU = <!-- A/B1/B2/B3/C/D/X --> | pregnancy_AU_comment = | pregnancy_US = <!-- A/B/C/D/X/N --> | pregnancy_category= | routes_of_administration = inhaled | legal_AU = <!-- S2, S3, S4, S5, S6, S7, S8, S9 or Unscheduled--> | legal_AU_comment = | legal_CA = <!-- OTC, Rx-only, Schedule I, II, III, IV, V, VI, VII, VIII --> | legal_DE = <!-- Anlage I, II, III --> | legal_NZ = <!-- Class A, B, C --> | legal_UK = <!-- GSL, P, POM, CD, CD Lic, CD POM, CD No Reg POM, CD (Benz) POM, CD (Anab) POM or CD Inv POM / Class A, B, C --> | legal_US = <!-- OTC/Rx-only/Schedule I, II, III, IV, V --> | legal_UN = <!-- N I, II, III, IV / P I, II, III, IV--> | legal_status = <!-- Free text --> <!-- Pharmacokinetic data --> | bioavailability = | protein_bound = | metabolism = | metabolites = | onset = | elimination_half-life = | duration_of_action = | excretion = <!-- Identifiers --> | CAS_number = 7782-44-7 | UNII_Ref = {{fdacite|correct|FDA}} | UNII = S88TT14065 | class = medical gas | ATCvet = | ATC_prefix = V03 | ATC_suffix = AN01 | PubChem = | DrugBank = | ChemSpiderID = none <!-- Chemical and physical data --> | chemical_formula = O<sub>2</sub> | molecular_weight = }} '''Oxygen therapy''', also called '''supplemental oxygen''', is when [[oxygen]] gas (O<sub>2</sub>) is used for [[medical treatment]] by giving the gas to the [[patient]] for [[inhalation]].<ref name=BNF69>{{cite book|title=British national formulary : BNF 69|url=https