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
Sort by and results per page
  • Search result 1

    Category Number 406
    Pack size 100 mg
    Substance name clocortolone hexanoate
    CAS Number 4891-71-8
    Quantitative No
    Current batch 1885
    E-mail to order:  bpcrs@mhra.gov.uk
  • Search result 2

    Category Number 663
    Pack size 100 mg
    Substance name clofazimine
    CAS Number 2030-63-9
    Quantitative Yes
    Current batch 2240
    QTY (Max 25)
  • Search result 3

    Category Number 543
    Pack size 100 mg
    Substance name clomethiazole edisilate
    CAS Number 1867-58-9
    Quantitative Yes
    Current batch 1842
    QTY (Max 25)
  • Search result 4

    Category Number 445
    Pack size 25 mg
    Substance name clomethiazole impurity A
    CAS Number Not applicable
    Quantitative No
    Current batch 4244
    E-mail to order:  bpcrs@mhra.gov.uk
  • Search result 5

    Category Number 446
    Pack size 25 mg
    Substance name clomethiazole impurity B
    CAS Number 71134-37-7
    Quantitative No
    Current batch 1631
    QTY (Max 25)
  • Search result 6

    Category Number 444
    Pack size 25 mg
    Substance name clomethiazole impurity C
    CAS Number 137-00-8
    Quantitative No
    Current batch 1630
    QTY (Max 25)
  • Search result 7

    Category Number 980
    Pack size 100 mg
    Substance name clomipramine hydrochloride
    CAS Number 17321-77-6
    Quantitative Yes
    Current batch 3815
    QTY (Max 25)
  • Search result 8

    Category Number 981
    Pack size 10 mg
    Substance name clomipramine impurity C
    CAS Number  2095-42-3
    Quantitative No
    Current batch 3260
    Discontinued
  • Search result 9

    Category Number 982
    Pack size 10 mg
    Substance name clomipramine impurity D
    CAS Number 3589-22-8
    Quantitative No
    Current batch 4366
    QTY (Max 25)
  • Search result 10

    Category Number 983
    Pack size 10 mg
    Substance name clomipramine impurity F
    CAS Number 32943-25-2
    Quantitative No
    Current batch 3262
    QTY (Max 25)