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.

951 items
Sort by and results per page
  • Search result 1

    Category Number 528
    Pack size 100 mg
    Substance name lormetazepam
    Declared content
    99.8% of C16H12Cl2N2O2
    Current batch 3200
    Out of Stock
  • Search result 2

    Category Number 867
    Pack size 150 mg
    Substance name losartan potassium
    Declared content
    99.9% of C22H22ClKN6O
    Current batch 3089
    QTY (Max 25)
  • Search result 3

    Category Number 218
    Pack size 100 mg
    Substance name lymecycline
    Declared content Not applicable
    Current batch 4228
    QTY (Max 10)
  • Search result 4

    Category Number 776
    Pack size 25 mg
    Substance name lynestrenol
    Declared content Not applicable
    Current batch 2910
    QTY (Max 25)
  • Search result 5

    Category Number 1007
    Pack size 1200 mg
    Substance name mannitol
    Declared content Not applicable
    Current batch 3963
    QTY (Max 25)
  • Search result 6

    Category Number 1306
    Pack size 100mg
    Substance name marbofloxacin
    Declared content
    99.8 % of C17H19FN4O4
    Current batch 4766
    QTY (Max 25)
  • Search result 7

    Category Number 1008
    Pack size 100 mg
    Substance name mebendazole
    Declared content
    99.7% of C16H13N3O3
    Current batch 4246
    QTY (Max 25)
  • Search result 8

    Category Number 1271
    Pack size 100 mg
    Substance name mebeverine hydrochloride
    Declared content
    99.8% of C25H35NO5,HCl
    Current batch 4521
    QTY (Max 25)
  • Search result 9

    Category Number 1273
    Pack size 1ml
    Substance name mebeverine impurity C
    Declared content Not applicable
    Current batch 4562
    QTY (Max 25)
  • Search result 10

    Category Number 1272
    Pack size 25mg
    Substance name mebeverine impurity standard
    Declared content Not applicable
    Current batch 4524
    QTY (Max 25)
  • Search result 11

    Category Number 220
    Pack size 100 mg
    Substance name meclozine hydrochloride
    Declared content Not applicable
    Current batch 3329
    QTY (Max 25)
  • Search result 12

    Category Number 221
    Pack size 100 mg
    Substance name medroxyprogesterone acetate
    Declared content
    99.2% of C24H34O4
    Current batch 4566
    QTY (Max 25)
  • Search result 13

    Category Number 222
    Pack size 25 mg
    Substance name megestrol
    Declared content Not applicable
    Current batch 3748
    QTY (Max 25)
  • Search result 14

    Category Number 223
    Pack size 100 mg
    Substance name megestrol acetate
    Declared content
    99.1% of C24H32O4
    Current batch 3544
    QTY (Max 25)
  • Search result 15

    Category Number 1077
    Pack size 100 mg
    Substance name melatonin
    Declared content
    99.8% of C13H16N2O2
    Current batch 3994
    QTY (Max 25)
  • Search result 16

    Category Number 1151
    Pack size 25 mg
    Substance name melitracen hydrochloride
    Declared content Not applicable
    Current batch 3760
    QTY (Max 25)
  • Search result 17

    Category Number 629
    Pack size 100 mg
    Substance name meloxicam
    Declared content
    99.8% of C14H13N3O4S2
    Current batch 4198
    QTY (Max 25)
  • Search result 18

    Category Number 630
    Pack size 100 mg
    Substance name meloxicam impurity standard
    Declared content Not applicable
    Current batch 4483
    QTY (Max 25)
  • Search result 19

    Category Number 391
    Pack size 100 mg
    Substance name melphalan
    Declared content
    91.3% of C13H18Cl2N2O2
    Current batch 3327
    QTY (Max 25)
  • Search result 20

    Category Number 699
    Pack size 100 mg
    Substance name mepivacaine hydrochloride
    Declared content
    99.8% of C15H22N2O2,HCl
    Current batch 4202
    QTY (Max 25)
  • Search result 21

    Category Number 583
    Pack size 100 mg
    Substance name meptazinol hydrochloride
    Declared content
    86.2% of C15H23NO
    Current batch 3747
    QTY (Max 25)
  • Search result 22

    Category Number 773
    Pack size 100 mg
    Substance name mercaptopurine
    Declared content
    98.8% of C5H4N4S, H2O
    Current batch 4365
    QTY (Max 1)
  • Search result 23

    Category Number 762
    Pack size 25 mg
    Substance name mercaptopurine impurity standard
    Declared content Not applicable
    Current batch 2902
    QTY (Max 25)
  • Search result 24

    Category Number 1075
    Pack size 125 mg
    Substance name mesalazine
    Declared content
    99.2% of C7H7NO3
    Current batch 3391
    QTY (Max 25)
  • Search result 25

    Category Number 496
    Pack size 50 mg
    Substance name mesoridazine besilate
    Declared content Not applicable
    Current batch 1767
    Discontinued