Mediclarum

ATC RRespiratory systemWHO

Breathing, airways, allergiesand cough

774 medicines · 111 active substances · from the Health Canada — Drug Product Database

Browse the substances How this group is made

Counted from the register

The group in figures

  • 774products listed in the register
  • 53%without prescription (414)
  • 198combination products — more than one substance

What the group contains

Anatomical main group R of the WHO ATC classification: “Respiratory system”. US records carry no ATC code: a product is here because the FDA pharmacologic class on its record maps to this group — not because of any judgement about who it is for.

101 marketing authorisation holders

  • R06 249
  • R03 220
  • R05 163
  • R01 83
  • R02 36
  • R07 23

ATC subgroups by code; their names are at the WHO index.

Source: Health Canada — Drug Product Database, 2026-09-30. Counts computed by Mediclarum from that file.

The most common
substances

DIPHENHYDRAMINE HYDROCHLORIDE105 products · 104 aloneDEXTROMETHORPHAN HYDROBROMIDE104 products · 54 aloneGUAIFENESIN77 products · 28 alone10490

and how often
they are combined

Numbers in the overlaps are products in the register that contain both substances (the centre: all three). Being sold together is not a statement that the substances are interchangeable, or that they should be combined.

Active substances in this group

Commonest first, by number of products in the register. Select one to see every product that contains it.

  1. 01Diphenhydramine Hydrochloride98 products94 OTC
  2. 02Montelukast (Montelukast Sodium)61 productsprescription only
  3. 03Cetirizine Hydrochloride54 products34 OTC
  4. 04Dimenhydrinate30 products25 OTC
  5. 05Fluticasone Propionate23 products3 OTC
  6. 06Dextromethorphan Hydrobromide22 products22 OTC
  7. 07Oxymetazoline Hydrochloride21 products21 OTC
  8. 08Cetylpyridinium Chloride19 products19 OTC
  9. 09Dextromethorphan Hydrobromide + Guaifenesin19 products19 OTC
  10. 10Salbutamol (Salbutamol Sulfate)19 productsprescription only
  11. 11Bilastine16 productsprescription only
  12. 12Guaifenesin16 products16 OTC
  13. 13Budesonide15 productsprescription only
  14. 14Loratadine15 products15 OTC
  15. 15Omalizumab13 productsprescription only
  16. 16Ipratropium Bromide11 productsprescription only
  17. 17Theophylline10 productsprescription only
  18. 18Dextromethorphan Hydrobromide + Pseudoephedrine Hydrochloride9 products9 OTC
  19. 19Fluticasone Propionate + Salmeterol (Salmeterol Xinafoate)9 productsprescription only
  20. 20Xylometazoline Hydrochloride9 products9 OTC
  21. 21Mometasone Furoate8 products1 OTC
  22. 22Desloratadine7 products7 OTC
  23. 23Dextromethorphan Hydrobromide + Pseudoephedrine Hydrochloride + Guaifenesin7 products7 OTC
  24. 24Guaifenesin + Dextromethorphan Hydrobromide7 products7 OTC
  25. 25Beclomethasone Dipropionate6 productsprescription only
  26. 26Codeine Phosphate6 productsprescription only
  27. 27Doxylamine Succinate + Pyridoxine Hydrochloride6 productsprescription only
  28. 28Guaifenesin + Menthol6 products6 OTC
  29. 29Hexylresorcinol6 products6 OTC
  30. 30Acetylcysteine5 productsprescription only
  31. 31Codeine Phosphate + Diphenhydramine Hydrochloride + Ammonium Chloride5 productsprescription only
  32. 32Cyproheptadine Hydrochloride5 products5 OTC
  33. 33Ivacaftor5 productsprescription only
  34. 34Rupatadine (Rupatadine Fumarate)5 productsprescription only
  35. 35Salmeterol (Salmeterol Xinafoate) + Fluticasone Propionate5 productsprescription only
  36. 36Ciclesonide4 productsprescription only
  37. 37Dextromethorphan Hydrobromide + Phenylephrine Hydrochloride + Brompheniramine Maleate4 products4 OTC
  38. 38Elexacaftor + Tezacaftor + Ivacaftor + Ivacaftor4 productsprescription only
  39. 39Tiotropium (Tiotropium Bromide Monohydrate)4 productsprescription only
  40. 40Triamcinolone Acetonide4 products2 OTC
  41. 41Brompheniramine Maleate + Phenylephrine Hydrochloride3 products3 OTC
  42. 42Budesonide + Formoterol Fumarate Dihydrate3 productsprescription only
  43. 43Codeine (Codeine Monohydrate, Codeine Sulfate Trihydrate)3 productsprescription only
  44. 44Codeine Phosphate + Pseudoephedrine Hydrochloride + Guaifenesin3 productsprescription only
  45. 45Dequalinium Chloride3 products3 OTC
  46. 46Dextromethorphan Hydrobromide + Doxylamine Succinate3 products3 OTC
  47. 47Dextromethorphan Hydrobromide + Guaifenesin + Menthol3 products3 OTC
  48. 48Dextromethorphan Hydrobromide + Phenylephrine Hydrochloride3 products3 OTC

Showing 48 of 147. Browse every substance A–Z

How this group is made

Each product is placed by the ATC code in its national register record (Bulgaria) or by the pharmacologic class the FDA assigned it (United States). Products without either are in no group rather than in a plausible one.

A group is not a diagnosis. Medicines are grouped by the class the regulator gave them. Which one suits you depends on things this page cannot know — ask a pharmacist or doctor.