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
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  • Search result 1

    Category Number 774
    Pack size 1
    Substance name hypromellose
    Declared content
    98.0% of hypromellose
    Current batch 2817
    Discontinued
  • Search result 2

    Category Number 539
    Pack size 200 mg
    Substance name ibuprofen
    Declared content
    99.9% of C13H18O2
    Current batch 4105
    QTY (Max 25)
  • Search result 3

    Category Number 880
    Pack size 1.15 mL
    Substance name ibuprofen impurity B
    Declared content
    None
    Current batch 4529
    QTY (Max 10)
  • Search result 4

    Category Number 202
    Pack size 100 mg
    Substance name idoxuridine
    Declared content
    99.9% of C9H11IN2O5
    Current batch 1722
    QTY (Max 25)
  • Search result 5

    Category Number 759
    Pack size 100 mg
    Substance name ifosfamide
    Declared content
    100.0% of C7H15Cl2N2O2P
    Current batch 2773
    QTY (Max 25)
  • Search result 6

    Category Number 1303
    Pack size 10mg
    Substance name imatinib impurity standard
    Declared content Not applicable
    Current batch 4778
    QTY (Max 5)
  • Search result 7

    Category Number 1302
    Pack size 100mg
    Substance name imatinib mesilate
    Declared content
    99.7% of C30H35N7SO4
    Current batch 4762
    QTY (Max 25)
  • Search result 8

    Category Number 664
    Pack size 25 mg
    Substance name iminophenazine
    Declared content Not applicable
    Current batch 4008
    QTY (Max 2)
  • Search result 9

    Category Number 932
    Pack size 100 mg
    Substance name imipramine hydrochloride
    Declared content
    99.5% of C19H25ClN2
    Current batch 4362
    QTY (Max 25)
  • Search result 10

    Category Number 999
    Pack size 150 mg
    Substance name indapamide
    Declared content
    97.8% of C16H16ClN3O3S
    Current batch 3227
    QTY (Max 25)
  • Search result 11

    Category Number 1000
    Pack size 10 mg
    Substance name indapamide impurity B
    Declared content Not applicable
    Current batch 3228
    QTY (Max 25)
  • Search result 12

    Category Number 1226
    Pack size 300 mg
    Substance name indian sandalwood oil
    Declared content Not applicable
    Current batch 4111
    QTY (Max 25)
  • Search result 13

    Category Number 1223
    Pack size 20 mg
    Substance name interferon beta-1a oxidised peptide
    Declared content Not applicable
    Current batch 4062
    QTY (Max 25)
  • Search result 14

    Category Number 625
    Pack size 100 mg
    Substance name ipratropium bromide
    Declared content
    100.3% of C20H30BrNO3,H2O
    Current batch 4185
    QTY (Max 25)
  • Search result 15

    Category Number 1232
    Pack size 25 mg
    Substance name ipratropium bromide impurity D
    Declared content Not applicable
    Current batch 4156
    QTY (Max 25)
  • Search result 16

    Category Number 1093
    Pack size 125 mg
    Substance name irbesartan
    Declared content
    99.7% of C25H28N6O
    Current batch 3461
    QTY (Max 25)
  • Search result 17

    Category Number 1122
    Pack size 10 mg
    Substance name irbesartan impurity A
    Declared content Not applicable
    Current batch 3676
    QTY (Max 25)
  • Search result 18

    Category Number 550
    Pack size 100 mg
    Substance name isoconazole nitrate
    Declared content
    99.7% of C18H14Cl4N2O,HNO3
    Current batch 2139
    Discontinued
  • Search result 19

    Category Number 1083
    Pack size 100 mg
    Substance name isoniazid
    Declared content
    99.7% of C6H7N3O
    Current batch 3400
    QTY (Max 25)
  • Search result 20

    Category Number 205
    Pack size 100 mg
    Substance name isoprenaline hydrochloride
    Declared content
    99.6% of C11H17NO3HCl
    Current batch 3889
    QTY (Max 5)
  • Search result 21

    Category Number 778
    Pack size 25 mg
    Substance name isopromethazine hydrochloride
    Declared content Not applicable
    Current batch 4441
    QTY (Max 25)
  • Search result 22

    Category Number 799
    Pack size 15 mg
    Substance name isosorbide 2-nitrate
    Declared content Not applicable
    Current batch 4880
    QTY (Max 2)
  • Search result 23

    Category Number 206
    Pack size 300 mg
    Substance name isosorbide dinitrate
    Declared content
    39.9% of C6H8N2O8
    Current batch 4416
    E-mail to order:  bpcrs@mhra.gov.uk
  • Search result 24

    Category Number 800
    Pack size 100 mg
    Substance name isosorbide mononitrate
    Declared content
    99.9% of C6H9NO6
    Current batch 4088
    Out of Stock
  • Search result 25

    Category Number 621
    Pack size 100 mg
    Substance name isradipine
    Declared content
    99.6% of C19H21N3O5
    Current batch 2166
    Discontinued