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.

Search within this catalogue

951 items

  • Search result 1

    Category Number 458
    Pack size 100 mg
    Substance name pyridoxine hydrochloride
    Declared content
    100.0% of C8H11NO3,HCl
    Current batch 4092
    QTY (Max 5)

  • Search result 2

    Category Number 1227
    Pack size 100 mg
    Substance name pyrimethamine
    Declared content
    99.5% of C12H13CIN4
    Current batch 4113
    QTY (Max 25)

  • Search result 3

    Category Number 1215
    Pack size 100 mg
    Substance name quetiapine fumarate
    Declared content
    99.7 % of C46H54N6O8S2 for HPLC 100.0 % of C46H54N6O8S2 for UV
    Current batch 4042
    QTY (Max 25)

  • Search result 4

    Category Number 1217
    Pack size 25 mg
    Substance name quetiapine impurity G
    Declared content Not applicable
    Current batch 4070
    QTY (Max 25)

  • Search result 5

    Category Number 1216
    Pack size 25 mg
    Substance name quetiapine impurity I
    Declared content Not applicable
    Current batch 4102
    QTY (Max 25)

  • Search result 6

    Category Number 1193
    Pack size 100 mg
    Substance name quinapril hydrochloride
    Declared content
    99.3% of C25H30N2O5, HCl
    Current batch 3930
    QTY (Max 25)

  • Search result 7

    Category Number 863
    Pack size 300 mg
    Substance name quinidine sulfate
    Declared content Not applicable
    Current batch 3876
    QTY (Max 25)

  • Search result 8

    Category Number 862
    Pack size 300 mg
    Substance name quinine sulfate
    Declared content
    96.8% of (C20H24N2O2)2,H2SO4,2H2O
    Current batch 4695
    QTY (Max 25)

  • Search result 9

    Category Number 751
    Pack size 100 mg
    Substance name ramipril
    Declared content
    99.9% of C23H32N2O5
    Current batch 3446
    QTY (Max 25)

  • Search result 10

    Category Number 754
    Pack size 25 mg
    Substance name ramipril impurity K
    Declared content Not applicable
    Current batch 3555
    QTY (Max 25)

  • Search result 11

    Category Number 471
    Pack size 100 mg
    Substance name ranitidine hydrochloride
    Declared content
    89.3% of C13H22N4O3S
    Current batch 3987
    QTY (Max 25)

  • Search result 12

    Category Number 1240
    Pack size 100 mg
    Substance name repaglinide
    Declared content
    99.9 % of C27H36N2O4
    Current batch 4172
    QTY (Max 25)

  • Search result 13

    Category Number 1252
    Pack size 2 mL
    Substance name repaglinide impurity standard solution
    Declared content Not applicable
    Current batch 4305
    QTY (Max 10)

  • Search result 14

    Category Number 593
    Pack size 100 mg
    Substance name ribavirin
    Declared content
    99.9% of C8H12N4O5
    Current batch 1980
    QTY (Max 25)

  • Search result 15

    Category Number 592
    Pack size 50 mg
    Substance name ribavirin impurity standard
    Declared content Not applicable
    Current batch 2015
    QTY (Max 2)

  • Search result 16

    Category Number 459
    Pack size 50 mg
    Substance name riboflavin sodium phosphate
    Declared content Not applicable
    Current batch 3382
    QTY (Max 25)

  • Search result 17

    Category Number 400
    Pack size 25 mg
    Substance name rifampicin N-oxide
    Declared content Not applicable
    Current batch 4025
    QTY (Max 25)

  • Search result 18

    Category Number 1241
    Pack size 100 mg
    Substance name risedronate sodium 2.5-hydrate
    Declared content
    86.2% of C7H10NNaO7P2
    Current batch 4157
    Out of Stock

  • Search result 19

    Category Number 1137
    Pack size 100 mg
    Substance name risperidone
    Declared content
    100.0% of C23H27FN4O2
    Current batch 3568
    QTY (Max 25)

  • Search result 20

    Category Number 1158
    Pack size 25 mg
    Substance name risperidone impurity standard
    Declared content Not applicable
    Current batch 4504
    QTY (Max 25)

  • Search result 21

    Category Number 586
    Pack size 200 mg
    Substance name ritodrine hydrochloride
    Declared content
    99.0% of C17H21NO3,HCl
    Current batch 1989
    QTY (Max 25)

  • Search result 22

    Category Number 1210
    Pack size 100 mg
    Substance name ritonavir
    Declared content
    99.7% of C37H48N6O5S2
    Current batch 4096
    QTY (Max 25)

  • Search result 23

    Category Number 1257
    Pack size 100 mg
    Substance name rivastigmine hydrogen tartrate
    Declared content
    97.0% of C18H28N2O8
    Current batch 4434
    QTY (Max 25)

  • Search result 24

    Category Number 1123
    Pack size 100 mg
    Substance name rizatriptan benzoate
    Declared content
    99.8 of C22H25N5O2
    Current batch 3604
    QTY (Max 25)

  • Search result 25

    Category Number 1242
    Pack size 100 mg
    Substance name rotigotine
    Declared content
    99.6% of C19H25NOS
    Current batch 4178
    QTY (Max 25)