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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  • Search result 1

    Category Number 346
    Pack size 50 mg
    Substance name z-triprolidine hydrochloride
    Declared content Not applicable
    Current batch 4592
    QTY (Max 25)
  • Search result 2

    Category Number 803
    Pack size 150 mg
    Substance name zidovudine
    Declared content
    99.3% of C10H13N5O4
    Current batch 2870
    QTY (Max 2)
  • Search result 3

    Category Number 850
    Pack size 50 mg
    Substance name zidovudine and lamivudine impurity standard
    Declared content Not applicable
    Current batch 4387
    QTY (Max 25)
  • Search result 4

    Category Number 895
    Pack size 25 mg
    Substance name zidovudine impurity standard
    Declared content Not applicable
    Current batch 3214
    QTY (Max 25)
  • Search result 5

    Category Number 1065
    Pack size 25 mg
    Substance name zolpidem impurity A
    Declared content Not applicable
    Current batch 4740
    QTY (Max 25)
  • Search result 6

    Category Number 1063
    Pack size 100 mg
    Substance name zolpidem tartrate
    Declared content
    97.3% of C42H48N6O8
    Current batch 4755
    Out of Stock
  • Search result 7

    Category Number 812
    Pack size 100 mg
    Substance name zopiclone
    Declared content
    99.80%
    Current batch 4382
    QTY (Max 10)
  • Search result 8

    Category Number 599
    Pack size 100 mg
    Substance name zuclopenthixol acetate dihydrochloride
    Declared content
    85.8% of C24H27ClN2O2S
    Current batch 3066
    QTY (Max 25)
  • Search result 9

    Category Number 596
    Pack size 100 mg
    Substance name zuclopenthixol decanoate dihydrochloride
    Declared content
    99.7% of C32H43ClN2O2S,2HCl
    Current batch 3065
    QTY (Max 25)
  • Search result 10

    Category Number 558
    Pack size 100 mg
    Substance name zuclopenthixol hydrochloride
    Declared content
    82.7% of C22H25ClN2OS
    Current batch 3064
    QTY (Max 25)
  • Search result 11

    Category Number 882
    Pack size 200 mg
    Substance name α-tocopherol
    Declared content Not applicable
    Current batch 3129
    QTY (Max 10)