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 520
    Pack size 100 mg
    Substance name phentolamine mesilate
    Declared content
    99.0% of C18H23N3O4S
    Current batch 4129
    QTY (Max 25)

  • Search result 2

    Category Number 1026
    Pack size 25 mg
    Substance name phenylacetic acid
    Declared content Not applicable
    Current batch 3357
    QTY (Max 25)

  • Search result 3

    Category Number 703
    Pack size 25 mg
    Substance name phenylcyclohexylglycolic acid
    Declared content Not applicable
    Current batch 3942
    QTY (Max 25)

  • Search result 4

    Category Number 284
    Pack size 100 mg
    Substance name phenylephrine hydrochloride
    Declared content
    100.0 % of C9H13NO2,HCl
    Current batch 4352
    QTY (Max 25)

  • Search result 5

    Category Number 1238
    Pack size 100 mg
    Substance name phenytoin sodium
    Declared content
    98.2% of C15H11N2NaO2
    Current batch 4142
    QTY (Max 25)

  • Search result 6

    Category Number 423
    Pack size 0.25 mL
    Substance name phytomenadione
    Declared content
    98.9% of C31H46O2
    Current batch 4623
    QTY (Max 5)

  • Search result 7

    Category Number 503
    Pack size 200 mg
    Substance name pilocarpine nitrate
    Declared content
    98.9% of C11H16N2O2,HNO3
    Current batch 2999
    QTY (Max 25)

  • Search result 8

    Category Number 1247
    Pack size 100 mg
    Substance name pimobendan
    Declared content
    99.5% of C19H18N4O2
    Current batch 4126
    QTY (Max 25)

  • Search result 9

    Category Number 682
    Pack size 100 mg
    Substance name pimozide
    Declared content
    99.5% of C28H29F2N3O
    Current batch 2256
    QTY (Max 25)

  • Search result 10

    Category Number 1298
    Pack size 100mg
    Substance name pioglitazone hydrochloride
    Declared content
    100.0% of C19H21CIN2O3S
    Current batch 4620
    QTY (Max 25)

  • Search result 11

    Category Number 1027
    Pack size 100 mg
    Substance name piperacillin
    Declared content
    92.3% of C23H29N5O8S
    Current batch 4583
    QTY (Max 25)

  • Search result 12

    Category Number 1171
    Pack size 250 mg
    Substance name piperonyl butoxide
    Declared content
    95.5 % of C19H30O5
    Current batch 4490
    QTY (Max 25)

  • Search result 13

    Category Number 1176
    Pack size 100 mg
    Substance name piperonyl butoxide impurity standard
    Declared content Not applicable
    Current batch 3886
    QTY (Max 25)

  • Search result 14

    Category Number 463
    Pack size 100 mg
    Substance name piroxicam
    Declared content
    99.3 % of C15H13N3O4S
    Current batch 4404
    QTY (Max 25)

  • Search result 15

    Category Number 411
    Pack size 50 mg
    Substance name pizotifen malate
    Declared content
    68.7% of C19H21NS
    Current batch 3471
    QTY (Max 25)

  • Search result 16

    Category Number 288
    Pack size 100 mg
    Substance name poldine metilsulfate
    Declared content
    99.0% of C22H29NO7S
    Current batch 2432
    Discontinued

  • Search result 17

    Category Number 1028
    Pack size 100 mg
    Substance name polymyxin B sulfate
    Declared content Not applicable
    Current batch 4128
    QTY (Max 25)

  • Search result 18

    Category Number 289
    Pack size 100 mg
    Substance name polythiazide
    Declared content
    98.5% of C11H13ClF3N3O4S3
    Current batch 1449
    QTY (Max 25)

  • Search result 19

    Category Number 510
    Pack size 25 mg
    Substance name potassium trichloroammineplatinate
    Declared content Not applicable
    Current batch 4396
    QTY (Max 25)

  • Search result 20

    Category Number 1203
    Pack size 100 mg
    Substance name pramipexole
    Declared content
    69.7% of C10H17N3S
    Current batch 3969
    QTY (Max 25)

  • Search result 21

    Category Number 1204
    Pack size 25 mg
    Substance name pramipexole impurity A
    Declared content Not applicable
    Current batch 3970
    QTY (Max 25)

  • Search result 22

    Category Number 1029
    Pack size 100 mg
    Substance name pravastatin 1,1,3,3,-tetramethylbutylamine
    Declared content
    76.5% of C23H36O7
    Current batch 3323
    QTY (Max 5)

  • Search result 23

    Category Number 1030
    Pack size 10 mg
    Substance name pravastatin impurity A
    Declared content Not applicable
    Current batch 3324
    Out of Stock

  • Search result 24

    Category Number 399
    Pack size 100 mg
    Substance name prazosin hydrochloride
    Declared content
    91.0% of C19H21N5O4
    Current batch 4140
    QTY (Max 25)

  • Search result 25

    Category Number 464
    Pack size 100 mg
    Substance name prednisolone
    Declared content
    98.4% of C21H28O5
    Current batch 3757
    QTY (Max 25)