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 911
    Pack size 25 mg
    Substance name metacycline hydrochloride
    Declared content Not applicable
    Current batch 3807
    Out of Stock

  • Search result 2

    Category Number 226
    Pack size 100 mg
    Substance name metaraminol tartrate
    Declared content Not applicable
    Current batch 4381
    QTY (Max 25)

  • Search result 3

    Category Number 1296
    Pack size 10mg
    Substance name metformin for system suitability
    Declared content Not applicable
    Current batch 4708
    QTY (Max 25)

  • Search result 4

    Category Number 227
    Pack size 100 mg
    Substance name metformin hydrochloride
    Declared content
    100% of C4H12ClN5
    Current batch 4642
    QTY (Max 25)

  • Search result 5

    Category Number 1295
    Pack size 10 mg
    Substance name metformin impurity D
    Declared content Not applicable
    Current batch 4610
    Out of Stock

  • Search result 6

    Category Number 552
    Pack size 100 mg
    Substance name methadone hydrochloride
    Declared content
    99.9% of C21H27NO,HCl
    Current batch 4448
    Out of Stock

  • Search result 7

    Category Number 920
    Pack size 10 mg
    Substance name methyl 3, 5-diamino-6-chloropyrazine-2-carboxylate
    Declared content Not applicable
    Current batch 3360
    QTY (Max 25)

  • Search result 8

    Category Number 237
    Pack size 25 mg
    Substance name methyl N-4[2-(5-chloro-2-methoxybenzamido)ethyl]benzenesulfonylcarbamate
    Declared content Not applicable
    Current batch 3515
    QTY (Max 25)

  • Search result 9

    Category Number 644
    Pack size 25 mg
    Substance name methyl-4-acetamido-2-hydroxybenzoate
    Declared content Not applicable
    Current batch 2150
    QTY (Max 25)

  • Search result 10

    Category Number 240
    Pack size 100 mg
    Substance name methyldopa
    Declared content
    88.6% of C10H13NO4
    Current batch 3034
    QTY (Max 25)

  • Search result 11

    Category Number 241
    Pack size 100 mg
    Substance name methyldopate hydrochloride
    Declared content
    99.5% of C12H17NO4,HCl
    Current batch 2513
    QTY (Max 25)

  • Search result 12

    Category Number 1201
    Pack size 100 mg
    Substance name methylphenidate hydrochloride
    Declared content
    99.8% of C14H19NO2, HCl
    Current batch 4013
    Out of Stock

  • Search result 13

    Category Number 662
    Pack size 100 mg
    Substance name methylphenobarbital
    Declared content
    99.8% of C13H14N2O3
    Current batch 2265
    Out of Stock

  • Search result 14

    Category Number 248
    Pack size 100 mg
    Substance name methylprednisolone
    Declared content
    99.7% of C22H30O5
    Current batch 2885
    QTY (Max 25)

  • Search result 15

    Category Number 249
    Pack size 200 mg
    Substance name methylprednisolone acetate
    Declared content
    99.0% of C24H32O6
    Current batch 3086
    QTY (Max 25)

  • Search result 16

    Category Number 233
    Pack size 1
    Substance name methyl[2-(2-methylbenzhydryloxy)ethyl]amine hydrochloride
    Declared content Not applicable
    Current batch
    Discontinued

  • Search result 17

    Category Number 409
    Pack size 50 mg
    Substance name methysergide maleate
    Declared content
    72.6% of C21H27N3O2
    Current batch 1478
    Discontinued

  • Search result 18

    Category Number 642
    Pack size 100 mg
    Substance name metipranolol
    Declared content
    98.9% of C17H27NO4
    Current batch 2201
    QTY (Max 25)

  • Search result 19

    Category Number 357
    Pack size 100 mg
    Substance name metoclopramide hydrochloride
    Declared content
    94.8% of C14H22ClN3O2,HCl
    Current batch 3792
    QTY (Max 25)

  • Search result 20

    Category Number 540
    Pack size 100 mg
    Substance name metoprolol tartrate
    Declared content
    99.9% of (C13H25NO3)2,C4H6O6
    Current batch 3011
    QTY (Max 25)

  • Search result 21

    Category Number 603
    Pack size 150 mg
    Substance name metronidazole
    Declared content
    99.5 % of C6H9N3O3
    Current batch 4707
    QTY (Max 25)

  • Search result 22

    Category Number 735
    Pack size 100 mg
    Substance name metronidazole benzoate
    Declared content
    62.2% of C6H9N3O3
    Current batch 3059
    Out of Stock

  • Search result 23

    Category Number 251
    Pack size 100 mg
    Substance name mexenone
    Declared content Not applicable
    Current batch 935
    QTY (Max 25)

  • Search result 24

    Category Number 252
    Pack size 100 mg
    Substance name mianserin hydrochloride
    Declared content
    99.4% of C18H20N2,HCl
    Current batch 3331
    QTY (Max 25)

  • Search result 25

    Category Number 884
    Pack size 25 mg
    Substance name miconazole impurity A
    Declared content Not applicable
    Current batch 3138
    QTY (Max 25)