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.

37 items
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  • Search result 1

    Category Number 139
    Pack size 100 mg
    Substance name econazole nitrate
    Declared content
    99.6% of C18H15Cl3N2O,HNO3
    Current batch 4208
    QTY (Max 25)
  • Search result 2

    Category Number 743
    Pack size 20 mg
    Substance name enalapril diketopiperazine
    Declared content Not applicable
    Current batch 4286
    QTY (Max 25)
  • Search result 3

    Category Number 741
    Pack size 100 mg
    Substance name enalapril maleate
    Declared content
    99.8% of C20H28N2O5,C4H4O4
    Current batch 2673
    QTY (Max 5)
  • Search result 4

    Category Number 742
    Pack size 20 mg
    Substance name enalaprilat
    Declared content Not applicable
    Current batch 3090
    QTY (Max 25)
  • Search result 5

    Category Number 1286
    Pack size 100 mg
    Substance name enrofloxacin
    Declared content
    99.2 % of C19H22FN3O3
    Current batch 4597
    QTY (Max 25)
  • Search result 6

    Category Number 387
    Pack size 100 mg
    Substance name ephedrine hydrochloride
    Declared content
    99.8% of C10H15NO,HCl
    Current batch 4284
    QTY (Max 5)
  • Search result 7

    Category Number 992
    Pack size 100 mg
    Substance name epirubicin hydrochloride
    Declared content
    96.0% of C27H29NO11,HCl
    Current batch 3559
    QTY (Max 25)
  • Search result 8

    Category Number 788
    Pack size 500 mg
    Substance name ergocalciferol
    Declared content
    99.0 % of C28H44O
    Current batch 4439
    QTY (Max 25)
  • Search result 9

    Category Number 405
    Pack size 100 mg
    Substance name ergometrine maleate
    Declared content
    97.2 % of C19H23N3O2, C4H4O4
    Current batch 4545
    QTY (Max 5)
  • Search result 10

    Category Number 141
    Pack size 200 mg
    Substance name ergotamine tartrate
    Declared content
    calculated by user
    Current batch 3892
    Discontinued
  • Search result 11

    Category Number 781
    Pack size 100 mg
    Substance name erythromycin
    Declared content
    94.8% of C37H67NO13
    0.3% of C37H67NO12
    1.1% of C36H65NO13
    Current batch 4800
    QTY (Max 10)
  • Search result 12

    Category Number 794
    Pack size 250 mg
    Substance name erythromycin A
    Declared content
    96.7% of C37H67NO13
    Current batch 2879
    Discontinued
  • Search result 13

    Category Number 795
    Pack size 50 mg
    Substance name erythromycin B
    Declared content
    98.7% of C37H67NO12
    Current batch 2880
    Discontinued
  • Search result 14

    Category Number 796
    Pack size 50 mg
    Substance name erythromycin C
    Declared content
    96.6% of C36H65NO13
    Current batch 2881
    Discontinued
  • Search result 15

    Category Number 790
    Pack size 100 mg
    Substance name erythromycin estolate
    Declared content Not applicable
    Current batch 2860
    QTY (Max 25)
  • Search result 16

    Category Number 798
    Pack size 50 mg
    Substance name erythromycin ethyl succinate
    Declared content Not applicable
    Current batch 2842
    QTY (Max 25)
  • Search result 17

    Category Number 488
    Pack size 100 mg
    Substance name erythromycin stearate
    Declared content
    63.8% of C37H67NO13
    Current batch 3430
    QTY (Max 1)
  • Search result 18

    Category Number 396
    Pack size 50 mg
    Substance name estradiol benzoate
    Declared content
    99.0% of C25H28O3
    Current batch 2370
    QTY (Max 25)
  • Search result 19

    Category Number 729
    Pack size 100 mg
    Substance name estradiol hemihydrate
    Declared content
    96.3% of C18H24O2
    Current batch 3408
    QTY (Max 25)
  • Search result 20

    Category Number 142
    Pack size 25 mg
    Substance name estramustine
    Declared content Not applicable
    Current batch 2815
    Discontinued