British Pharmacopoeia Chemical reference substances (BPCRS)

These Primary standards are established using absolute methods and the declared content figures are determined without comparing to another substance. You should use BPCRS to perform the tests in the British Pharmacopoeia (BP) or BP (Veterinary). Do not eat BPCRS or feed them to animals – you should only use BPCRS for chemical analysis. They are not suitable for any other use.

The BPCRS Catalogue is now available for download in Excel format, updated monthly to reflect the latest listings.

New customer rules in Egypt

New customs rules in Egypt means additional actions are required by purchasers of the BPCRS if your order is over the value of £1600 or the shipment weighs more than 50kg. Please refer to the Egypt shipments guidance to learn what steps you will need to take if your order meets this criteria.  

970 items
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  • Search result 1

    Category Number 764
    Pack size 25 mg
    Substance name oxibendazole
    CAS Number 20559-55-1
    Quantitative No
    Current batch 2945
    QTY (Max 25)
  • Search result 2

    Category Number 700
    Pack size 100 mg
    Substance name oxybuprocaine hydrochloride
    CAS Number 5987-82-6
    Quantitative Yes
    Current batch 3804
    QTY (Max 2)
  • Search result 3

    Category Number 701
    Pack size 100 mg
    Substance name oxybutynin hydrochloride
    CAS Number 1508-65-2
    Quantitative Yes
    Current batch 3921
    QTY (Max 25)
  • Search result 4

    Category Number 273
    Pack size 200 mg
    Substance name oxyclozanide
    CAS Number 2277-92-1
    Quantitative No
    Current batch 4016
    QTY (Max 25)
  • Search result 5

    Category Number 1068
    Pack size 100 mg
    Substance name oxycodone hydrochloride
    CAS Number 124-90-3
    Quantitative Yes
    Current batch 4211
    QTY (Max 25)
  • Search result 6

    Category Number 1136
    Pack size 25 mg
    Substance name oxycodone impurity standard
    CAS Number 124-90-3
    Quantitative No
    Current batch 3649
    QTY (Max 25)
  • Search result 7

    Category Number 416
    Pack size 1
    Substance name oxyphenbutazone
    CAS Number Not applicable
    Quantitative No
    Current batch
    Discontinued
  • Search result 8

    Category Number 782
    Pack size 100 mg
    Substance name oxytetracycline
    CAS Number 79-57-2
    Quantitative Yes
    Current batch 2830
    QTY (Max 25)
  • Search result 9

    Category Number 275
    Pack size 20 mg
    Substance name oxytetracycline hydrochloride
    CAS Number 2058-46-0
    Quantitative No
    Current batch 4082
    QTY (Max 25)
  • Search result 10

    Category Number 769
    Pack size 20 mg
    Substance name paeoniflorin
    CAS Number 23180-57-6
    Quantitative Yes
    Current batch 3571
    E-mail to order:  bpcrs@mhra.gov.uk