藥品資訊系統 ATC and DDD System 2012/05/31 藥師 王子麟

Drug utilization research WHO Collaborating Centre for Drug Statistics Methodology Norway established in 1982

Outline 1.ATC classification (plain and combination) 2.DDD (plain and combination) 3.Example

ATC classification 1.Anatomical – 1st level fourteen main groups 2.Therapeutic – 2nd level therapeutic subgroup – 3rd level pharmacological subgroup 3.Chemical – 4th level chemical subgroup – 5th level chemical substance 4.The 2nd, 3rd and 4th levels are often used to identify pharmacological subgroups when that is considered more appropriate than therapeutic or chemical subgroups.

A 10 B A 02 Alimentary tract and metabolism (1st level, anatomical main group) Drugs used in diabetes (2nd level, therapeutic subgroup) Blood glucose lowering drugs, excl. insulins (3rd level, pharmacological subgroup) Biguanides (4th level, chemical subgroup) Metformin (5th level, chemical substance)

1st level Anatomical main group 1.A -- Alimentary tract and metabolism 2.B -- Blood and blood forming organs 3.C -- Cardiovascular system 4.D -- Dermatologicals 5.G -- Genito urinary system and sex hormones 6.H -- Systemic Hormonal preparations, excl. sex hormones and insulins 7.J -- Antiinfectives for systemic use 8.L -- Antineoplastic and immunomodulating agents 9.M -- Musculo-skeletal system 10.N -- Nervous system 11.P -- Antiparasitic products, insecticides and repellents 12.R -- Respiratory system 13.S -- Sensory organs 14.V -- Various

General principles for ATC classification  According to the main therapeutic use of the main active ingredient, on the basic principle of only one ATC code for each route of administration A.Plain products are defined as preparations containing one active component 1.Sex hormones only used in the treatment of cancer-- L02 Endocrine therapy others -- G03 Sex hormones and modulators of the genital system 2.Finasteride A low strength tablet for male pattern baldness -- D11AX Other dermatologicals (Propecia : 1mg QD ) A high strength tablet for benign prostatic hypertrophy is classified under -- G04C Drugs used in BPH (Proscar:5mg QD)

General principles for ATC classification 3.Prednisolone A07EA01 -Intestinal antiinflammatory agents (enemas and foams) C05AA04 -Antihemorrhoidals for topical use (suppositories) D07AA03 -Dermatological preparations (creams, ointments and lotions) H02AB06 -Corticosteroids for systemic use (tablets, injections) R01AD02 -Nasal decongestants (nasal sprays/drops) S01BA04 -Ophthalmologicals (eye drops) S02BA03 -Otologicals (ear drops)

General principles for ATC classification B.Products containing two or more active ingredients are regarded as Combination products 1.the same 4th level are normally classified using the 5th level codes 20 or 30 N01BB02 lidocaine N01BB04 prilocaine N01BB20 combinations (e.g. lidocaine and prilocaine) 2. Not belonging to the same 4th level are classified using the 50-series R06AA02 diphenhydramine R06AA52 diphenhydramine, combinations

General principles for ATC classification 3.Containing psycholeptic drugs, which are not classified under N05 - Psycholeptics or N06 - Psychoanaleptics, are classified at separate 5th levels using the 70-series N02BA71 - acetylsalicylic acid, combinations with psycholeptics 4.The main therapeutic use decides the classification combinations of analgesics and antispasmodics will be classified in A03 Drugs for functional gastrointestinal disorders if the antispasmodic effect of the product is considered most important. (N02 ANALGESICS)

Defined Daily Dose (DDD)  The ultimate goal of drug utilization research must be to assess whether drug therapy is rational or not. 1.The DDD is the assumed average maintenance dose per day for a drug used for its main indication in adults 2.A DDD will only be assigned for drugs that already have an ATC code 3.DDDs are not established for – Topical products – Sera – Vaccines – Antineoplastic agents – Allergen extracts – General and local anesthetics – Contrast media

Principles for DDD assignment  The basic principle is to assign only one DDD per route of administration within an ATC code  When the recommended dose refers to body weight, an adult is considered to be a person of 70 kg A.Plain products 1.The maintenance dose is usually preferred when establishing the DDD 2.Examples of interpretation of approved dose titration recommendations : “Titrate up to a high dose if it is tolerated”: the high dose would normally be chosen as the DDD “Consider to increase the dose only if efficacy is not satisfactory with initial dose”: the DDD would normally be based on the initial dose

Principles for DDD assignment B.Combination products 1.Treatment with two products, each containing one active ingredient: –Product A: Tablets containing 20 mg of substance X (DDD = 20 mg) –Product B: Tablets containing 25 mg of substance Y (DDD = 25 mg) –The dosing schedule 1 tablet of A plus 1 tablet of B daily will be calculated as a consumption of 2 DDDs.

Principles for DDD assignment 2.Treatment with a combination product containing two active ingredients: –Product C: Tablets containing 20 mg of substance X and 12.5 mg of substance Y. –The DDD of the combination products is assigned as 1 UD = 1 tablet. –The dosing schedule 1 tablet of C daily will be calculated as 1 DDD

Principles for DDD assignment 3.For the 50- and 70-series combinations (other than the combination products used in hypertension), the DDD should be equal to the DDD for the main active ingredient 4.Used for treatment of hypertension (e.g. ATC group C02, C03, C07, C08 and C09), DDDs are based on the average number of dosing intervals per day –1 tablet is the DDD for combinations given once daily –2 tablets is the DDD for combinations given twice daily –3 tablets is the DDD for combinations given three times daily etc.

Example 1.Drug utilization research 2.ADR 3. 院內藥品搜尋

For some diseases it may be important to study the relative use of drug treatment and other therapeutic approaches to map out and understand pharmacotherapeutic traditions and other therapeutic approaches.

ADR 通報案件 資料來源至 99 年 12 月底

利用 CG41 查詢 ATC code

1st level Anatomical main group 1.A -- Alimentary tract and metabolism 2.B -- Blood and blood forming organs 3.C -- Cardiovascular system 4.D -- Dermatologicals 5.G -- Genito urinary system and sex hormones 6.H -- Systemic hormonal preparations, excl. sex hormones and insulins 7.J -- Antiinfectives for systemic use 8.L -- Antineoplastic and immunomodulating agents 9.M -- Musculo-skeletal system 10.N -- Nervous system 11.P -- Antiparasitic products, insecticides and repellents 12.R -- Respiratory system 13.S -- Sensory organs 14.V -- Various

H02AB06

H02A CORTICOSTEROIDS FOR SYSTEMIC USE, PLAIN H02AA Mineralocorticoids H02AB Glucocorticoids (prednisolone)

H02AB Glucocorticoids

A07EA01

A07E INTESTINAL ANTIINFLAMMATORY AGENTS A07EA Corticosteroids acting locally (prednisolone) A07EB Antiallergic agents, excl. corticosteroids A07EC Aminosalicylic acid and similar agents

A07EC Aminosalicylic acid and similar agents

R01AD02

R01A NASAL DECONGESTANTS R01AA Sympathomimetics, plain R01AB Sympathomimetics, combinations excl. corticosteroids R01AC Antiallergic agents, excl. corticosteroids R01AD Corticosteroids (prednisolone) R01AX Other nasal preparations

R01AB Sympathomimetics, combinations excl. corticosteroids Sympathomimetics -- Ephedrine HCl Antibiotics --Tyrothricin

處方集

B01A ANTITHROMBOTIC AGENTS B01AA Vitamin K antagonists B01AB Heparin group B01AC Platelet aggregation inhibitors excl. heparin (Bokey) B01AD Enzymes B01AE Direct thrombin inhibitors B01AX Other antithrombotic agents

資料來源