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 245
    Pack size 25 mg
    Substance name (1-methyl-5-nitroimidazol-2-yl)methanol
    Declared content Not applicable
    Current batch 2688
    QTY (Max 1)

  • Search result 2

    Category Number 37
    Pack size 25 mg
    Substance name (1S,2R)-1-benzyl-3-dimethylamino-2-methyl-1-phenylpropyl acetate
    Declared content Not applicable
    Current batch 2646
    QTY (Max 25)

  • Search result 3

    Category Number 1059
    Pack size 20 mg
    Substance name (2-amino-5-nitrophenyl)(2-chlorophenyl)methanone
    Declared content Not applicable
    Current batch 3532
    QTY (Max 25)

  • Search result 4

    Category Number 531
    Pack size 25 mg
    Substance name (2-butylbenzofuran-3-yl)(4-hydroxy-3,5-diiodophenyl)methanone
    Declared content Not applicable
    Current batch 3777
    QTY (Max 25)

  • Search result 5

    Category Number 888
    Pack size 25 mg
    Substance name (5RS)-3-(2-hydroxyphenyl)-5-phenylcyclohex-2-enone
    Declared content Not applicable
    Current batch 3170
    QTY (Max 25)

  • Search result 6

    Category Number 602
    Pack size 25 mg
    Substance name (E)-4-amino-2-ethylidenebutyric acid hydrochloride
    Declared content Not applicable
    Current batch 1956
    Discontinued

  • Search result 7

    Category Number 441
    Pack size 25 mg
    Substance name 1,4-bis(4-chlorobenzhydryl)piperazine
    Declared content Not applicable
    Current batch 4513
    QTY (Max 25)

  • Search result 8

    Category Number 456
    Pack size 50 mg
    Substance name 1,5-dimethylhexyl(methyl)amine
    Declared content Not applicable
    Current batch 1647
    QTY (Max 25)

  • Search result 9

    Category Number 721
    Pack size 25 mg
    Substance name 1-(2,5-dichlorophenyl)-5-isopropylbiguanide hydrochloride
    Declared content Not applicable
    Current batch 2381
    QTY (Max 25)

  • Search result 10

    Category Number 232
    Pack size 25 mg
    Substance name 1-(2-methoxyphenyl)piperazine
    Declared content Not applicable
    Current batch 1589
    E-mail to order:  bpcrs@mhra.gov.uk

  • Search result 11

    Category Number 955
    Pack size 25 mg
    Substance name 1-(4-chlorophenyl)-1-phenylethanol
    Declared content Not applicable
    Current batch 4288
    QTY (Max 25)

  • Search result 12

    Category Number 609
    Pack size 50 mg
    Substance name 1-benzyl-1H-indazol-3-ol
    Declared content Not applicable
    Current batch 3940
    QTY (Max 25)

  • Search result 13

    Category Number 611
    Pack size 50 mg
    Substance name 1-benzyl-3-(3-diethylamino-propoxy)-1H-indazole
    Declared content Not applicable
    Current batch 4085
    QTY (Max 25)

  • Search result 14

    Category Number 481
    Pack size 25 mg
    Substance name 1-hydroxy-9-anthrone
    Declared content Not applicable
    Current batch 2181
    QTY (Max 25)

  • Search result 15

    Category Number 476
    Pack size 25 mg
    Substance name 1-methyl-3-[2-(5-methylimidazol-4-yl-methylthio)ethyl]guanidine dihydrochloride
    Declared content Not applicable
    Current batch 2992
    QTY (Max 25)

  • Search result 16

    Category Number 605
    Pack size 25 mg
    Substance name 1-methyl-4-(2-benzoylhydrazino)azepan hydrochloride
    Declared content Not applicable
    Current batch 2051
    Discontinued

  • Search result 17

    Category Number 606
    Pack size 25 mg
    Substance name 1-methylazepan-4-one hydrochloride
    Declared content Not applicable
    Current batch
    Discontinued

  • Search result 18

    Category Number 1118
    Pack size 15 mg
    Substance name 1-methylpiperazine
    Declared content Not applicable
    Current batch 3573
    QTY (Max 25)

  • Search result 19

    Category Number 35
    Pack size 50 mg
    Substance name 1-phenyl-3-pyrrolidinopropan-1-one hydrochloride
    Declared content Not applicable
    Current batch 4265
    QTY (Max 25)

  • Search result 20

    Category Number 49
    Pack size 25 mg
    Substance name 17β,17'β-bis{3-[bis(2-chloroethyl)carbamoyloxy]estra1,3,5,(10)-trienyl}pyrophosphate
    Declared content Not applicable
    Current batch 4229
    Discontinued

  • Search result 21

    Category Number 364
    Pack size 25 mg
    Substance name 2,2-dimethyl-5-(2,4-xylyloxy)valeric acid
    Declared content Not applicable
    Current batch 2599
    E-mail to order:  bpcrs@mhra.gov.uk

  • Search result 22

    Category Number 122
    Pack size 50 mg
    Substance name 2,3-dihydro-6-phenylimidazo[2,1,b]-thiazole
    Declared content Not applicable
    Current batch 4480
    QTY (Max 25)

  • Search result 23

    Category Number 526
    Pack size 100 mg
    Substance name 2-(2-hydroxyethyl)-1-methylpyrrolidine
    Declared content Not applicable
    Current batch 4112
    QTY (Max 25)

  • Search result 24

    Category Number 77
    Pack size 25 mg
    Substance name 2-(6-chlorothymoxy)ethyldimethylamine hydrochloride
    Declared content Not applicable
    Current batch
    Discontinued

  • Search result 25

    Category Number 194
    Pack size 25 mg
    Substance name 2-(6-hydroxythymoxy)ethyldimethylamine hydrochloride
    Declared content Not applicable
    Current batch 2040
    QTY (Max 25)