What does HBR stand for in cough syrup?

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  2. #lacking
  3. #producing
  4. #properties
  5. #depression
  6. #counter
  7. #levorphanol
  8. #little
  9. #suppressant
  10. #system
  11. #hydrobromide
  12. #analog
  13. #central
  14. #c18h25no
  15. #especially
  16. #widely
  17. #preparations
  18. #codeine
  19. #cough
  20. #nervous
  21. #abbreviation