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 856
    Pack size 50 mg
    Substance name chlorpromazine hydrochloride
    CAS Number 69-09-0
    Quantitative No
    Current batch 3010
    QTY (Max 25)
  • Search result 2

    Category Number 467
    Pack size 50 mg
    Substance name chlorpromazine sulfoxide
    CAS Number 969-99-3
    Quantitative No
    Current batch 2914
    QTY (Max 25)
  • Search result 3

    Category Number 491
    Pack size 100 mg
    Substance name chlortalidone
    CAS Number 77-36-1
    Quantitative Yes
    Current batch 3196
    QTY (Max 25)
  • Search result 4

    Category Number 75
    Pack size 25 mg
    Substance name chlortalidone impurity B
    CAS Number 5270-74-6
    Quantitative No
    Current batch 4019
    QTY (Max 25)
  • Search result 5

    Category Number 783
    Pack size 100 mg
    Substance name chlortetracycline hydrochloride
    CAS Number 64-72-2
    Quantitative Yes
    Current batch 4193
    QTY (Max 25)
  • Search result 6

    Category Number 618
    Pack size 100 mg
    Substance name cholic acid
    CAS Number 81-25-4
    Quantitative Yes
    Current batch 4489
    Discontinued
  • Search result 7

    Category Number 475
    Pack size 100 mg
    Substance name cimetidine
    CAS Number 51481-61-9
    Quantitative Yes
    Current batch 3187
    QTY (Max 25)
  • Search result 8

    Category Number 1219
    Pack size 100 mg
    Substance name cinnarizine
    CAS Number 298-57-7
    Quantitative Yes
    Current batch 4032
    QTY (Max 25)
  • Search result 9

    Category Number 1278
    Pack size 100 mg
    Substance name ciprofibrate
    CAS Number 52214-84-3
    Quantitative Yes
    Current batch 4502
    QTY (Max 25)
  • Search result 10

    Category Number 1312
    Pack size 1.2mL
    Substance name ciprofibrate impurity standard
    CAS Number 52214-84-3
    Quantitative No
    Current batch 4886
    QTY (Max 25)
  • Search result 11

    Category Number 929
    Pack size 100 mg
    Substance name ciprofloxacin hydrochloride
    CAS Number 86393-32-0
    Quantitative Yes
    Current batch 4225
    QTY (Max 25)
  • Search result 12

    Category Number 930
    Pack size 10 mg
    Substance name ciprofloxacin impurity standard
    CAS Number Not applicable
    Quantitative No
    Current batch 3453
    QTY (Max 25)
  • Search result 13

    Category Number 597
    Pack size 100 mg
    Substance name cis-flupenthixol propionate dihydrochloride
    CAS Number Not applicable
    Quantitative No
    Current batch 2019
    QTY (Max 2)
  • Search result 14

    Category Number 738
    Pack size 25 mg
    Substance name cis-flupentixol
    CAS Number 53772-82-0
    Quantitative No
    Current batch 4213
    QTY (Max 25)
  • Search result 15

    Category Number 809
    Pack size 100 mg
    Substance name cisplatin
    CAS Number 15663-27-1
    Quantitative Yes
    Current batch 4699
    QTY (Max 25)
  • Search result 16

    Category Number 1153
    Pack size 100 mg
    Substance name citalopram hydrobromide
    CAS Number 59729-32-7
    Quantitative Yes
    Current batch 3718
    QTY (Max 25)
  • Search result 17

    Category Number 1154
    Pack size 10 mg
    Substance name citalopram impurity standard
    CAS Number 59729-32-7
    Quantitative No
    Current batch 3765
    QTY (Max 25)
  • Search result 18

    Category Number 833
    Pack size 100 mg
    Substance name clarithromycin
    CAS Number 81103-11-9
    Quantitative Yes
    Current batch 4570
    QTY (Max 25)
  • Search result 19

    Category Number 834
    Pack size 20 mg
    Substance name clarithromycin impurity E
    CAS Number 81103-14-2
    Quantitative No
    Current batch 3028
    Discontinued
  • Search result 20

    Category Number 747
    Pack size 1
    Substance name clavulanate polymer
    CAS Number Not applicable
    Quantitative Not applicable
    Current batch
    Discontinued
  • Search result 21

    Category Number 525
    Pack size 200 mg
    Substance name clemastine fumarate
    CAS Number 14976-57-9
    Quantitative Yes
    Current batch 3457
    QTY (Max 25)
  • Search result 22

    Category Number 1220
    Pack size 100 mg
    Substance name clenbuterol hydrochloride
    CAS Number 21898-19-1
    Quantitative Yes
    Current batch 4065
    QTY (Max 25)
  • Search result 23

    Category Number 1231
    Pack size 25 mg
    Substance name clenbuterol impurity D
    CAS Number 99-92-3
    Quantitative No
    Current batch 4107
    QTY (Max 25)
  • Search result 24

    Category Number 419
    Pack size 100 mg
    Substance name clindamycin phosphate
    CAS Number 24729-96-2
    Quantitative Yes
    Current batch 4555
    QTY (Max 25)
  • Search result 25

    Category Number 84
    Pack size 200 mg
    Substance name clioquinol
    CAS Number 130-26-7
    Quantitative Yes
    Current batch 3107
    QTY (Max 25)
  • Search result 26

    Category Number 507
    Pack size 100 mg
    Substance name clobazam
    CAS Number 22316-47-8
    Quantitative Yes
    Current batch 4341
    QTY (Max 5)
  • Search result 27

    Category Number 522
    Pack size 25 mg
    Substance name clobetasol impurity A
    CAS Number 5534-13-4
    Quantitative No
    Current batch 2459
    Discontinued
  • Search result 28

    Category Number 1334
    Pack size 15mg
    Substance name Clobetasol Impurity C
    CAS Number Not applicable
    Quantitative No
    Current batch 4913
    QTY (Max 25)
  • Search result 29

    Category Number 521
    Pack size 100 mg
    Substance name clobetasol propionate
    CAS Number 25122-46-7
    Quantitative Yes
    Current batch 4336
    QTY (Max 10)
  • Search result 30

    Category Number 482
    Pack size 100 mg
    Substance name clobetasone butyrate
    CAS Number 25122-57-0
    Quantitative Yes
    Current batch 4563
    QTY (Max 25)
  • Search result 31

    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 32

    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 33

    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 34

    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 35

    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 36

    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 37

    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 38

    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 39

    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 40

    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)