Reference Standards

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.

07 August 2025

We are pleased to update that products affected by the recent electrical freezer fault are now available following their temporary withdrawal.

This follows a detailed quality assessment of vialled stock and re-vialing product from our reserved bulk supplies.

Thank you again for your patience while we worked to resolve this matter.

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951 items

  • Search result 1

    Category Number 60
    Pack size 100 mg
    Substance name carbidopa
    Declared content
    92.4% of C10H14N2O4
    Current batch 3412
    QTY (Max 25)

  • Search result 2

    Category Number 749
    Pack size 100 mg
    Substance name carbimazole
    Declared content
    99.9% of C7H10N2O2S
    Current batch 4469
    QTY (Max 25)

  • Search result 3

    Category Number 711
    Pack size 100 mg
    Substance name carboplatin
    Declared content
    99.8% of C6H12N2O4Pt
    Current batch 4453
    QTY (Max 25)

  • Search result 4

    Category Number 767
    Pack size 100 mg
    Substance name carmellose sodium
    Declared content
    99.9% of [C6H7O2(OH)x(OCH2COONa)y]n When: x = 1.50 to 2.8 y (degree of substitution) = 0.2 to 1.50 x + y = 3.0 (n = degree of polymerization)
    Current batch 4217
    QTY (Max 25)

  • Search result 5

    Category Number 1200
    Pack size 100 mg
    Substance name carprofen
    Declared content
    99.7% of C15H12ClNO2
    Current batch 3951
    QTY (Max 25)

  • Search result 6

    Category Number 567
    Pack size 100 mg
    Substance name carteolol hydrochloride
    Declared content
    99.8% of C16H24N2O3,HCl
    Current batch 1967
    QTY (Max 25)

  • Search result 7

    Category Number 1168
    Pack size 100 mg
    Substance name carvedilol
    Declared content
    99.8% of C24H26N2O4
    Current batch 3786
    QTY (Max 25)

  • Search result 8

    Category Number 792
    Pack size 450 mg
    Substance name cefaclor
    Declared content
    93.5% of C15H14ClN3O4S
    Current batch 3587
    QTY (Max 1)

  • Search result 9

    Category Number 784
    Pack size 100 mg
    Substance name cefadroxil
    Declared content
    93.8% of C16H17N3O5S
    Current batch 4414
    QTY (Max 25)

  • Search result 10

    Category Number 61
    Pack size 150 mg
    Substance name cefalexin
    Declared content
    93.2% of C16H17N3O4S
    Current batch 4249
    QTY (Max 25)

  • Search result 11

    Category Number 562
    Pack size 100 mg
    Substance name cefalonium
    Declared content
    92.1 % of C20H18N4O5S2 for UV use 90.1 % of C20H18N4O5S2 for HPLC use
    Current batch 4415
    QTY (Max 25)

  • Search result 12

    Category Number 908
    Pack size 100 mg
    Substance name cefalotin sodium
    Declared content Not applicable
    Current batch 3353
    QTY (Max 25)

  • Search result 13

    Category Number 819
    Pack size 150 mg
    Substance name cefazolin sodium
    Declared content
    91.5 % of C14H14N8O4S3
    Current batch 4811
    QTY (Max 25)

  • Search result 14

    Category Number 820
    Pack size 200 mg
    Substance name cefoxitin sodium
    Declared content
    See leaflet provided with the BPCRS
    Current batch 4214
    QTY (Max 25)

  • Search result 15

    Category Number 63
    Pack size 300 mg
    Substance name cefradine
    Declared content
    91.4 % of C16H19N3O4S (for HPLC use), 95.3% of Cephalosporins
    Current batch 4729
    QTY (Max 25)

  • Search result 16

    Category Number 976
    Pack size 100 mg
    Substance name ceftriaxone sodium
    Declared content
    88.6% of C18H16N8Na2O7S3
    Current batch 3952
    QTY (Max 25)

  • Search result 17

    Category Number 977
    Pack size 10 mg
    Substance name ceftriaxone sodium E-isomer
    Declared content Not applicable
    Current batch 3231
    Discontinued

  • Search result 18

    Category Number 502
    Pack size 100 mg
    Substance name cefuroxime axetil
    Declared content
    98.2 % of C20H22N4O10S
    Current batch 4801
    QTY (Max 25)

  • Search result 19

    Category Number 925
    Pack size 150 mg
    Substance name cefuroxime sodium
    Declared content
    94.4 % of C16H15N4NaO8S
    Current batch 4745
    QTY (Max 25)

  • Search result 20

    Category Number 1230
    Pack size 100 mg
    Substance name celecoxib
    Declared content
    99.7% of C17H14F3N3O2S
    Current batch 4125
    QTY (Max 25)

  • Search result 21

    Category Number 757
    Pack size 100 mg
    Substance name celiprolol hydrochloride
    Declared content
    99.6% of C20H33N3O4,HCl
    Current batch 2763
    QTY (Max 25)

  • Search result 22

    Category Number 837
    Pack size 100 mg
    Substance name cetirizine hydrochloride
    Declared content
    99.5 % of C21H25ClN2O3,2HCl
    Current batch 4559
    QTY (Max 25)

  • Search result 23

    Category Number 1081
    Pack size 50 mg
    Substance name cetirizine impurity standard
    Declared content Not applicable
    Current batch 4590
    QTY (Max 10)

  • Search result 24

    Category Number 926
    Pack size 25 mg
    Substance name chenodeoxycholic acid
    Declared content Not applicable
    Current batch 4636
    QTY (Max 25)

  • Search result 25

    Category Number 64
    Pack size 100 mg
    Substance name chlorambucil
    Declared content
    99.4% of C14H19Cl2NO2
    Current batch 3933
    QTY (Max 25)