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 854
    Pack size 500 mg
    Substance name chloramphenicol
    CAS Number 56-75-7
    Quantitative Yes
    Current batch 4715
    QTY (Max 2)
  • Search result 2

    Category Number 1061
    Pack size 1500 mg
    Substance name chloramphenicol sodium succinate
    CAS Number 982-57-0
    Quantitative No
    Current batch 3740
    QTY (Max 1)
  • Search result 3

    Category Number 67
    Pack size 100 mg
    Substance name chlorcyclizine hydrochloride
    CAS Number 14362-31-3
    Quantitative No
    Current batch 1193
    Discontinued
  • Search result 4

    Category Number 1187
    Pack size 100 mg
    Substance name chlordiazepoxide hydrochloride
    CAS Number 438-41-5
    Quantitative Yes
    Current batch 4014
    QTY (Max 25)
  • Search result 5

    Category Number 68
    Pack size 100 mg
    Substance name chlorhexidine acetate
    CAS Number 56-95-1
    Quantitative Yes
    Current batch 4639
    QTY (Max 25)
  • Search result 6

    Category Number 1299
    Pack size 10mg
    Substance name chlorhexidine impurity standard
    CAS Number Not applicable
    Quantitative No
    Current batch 4714
    QTY (Max 25)
  • Search result 7

    Category Number 1314
    Pack size 100mg
    Substance name chloroquine phosphate
    CAS Number 50-63-5
    Quantitative Yes
    Current batch 4834
    QTY (Max 25)
  • Search result 8

    Category Number 76
    Pack size 100 mg
    Substance name chlorothiazide
    CAS Number 58-94-6
    Quantitative No
    Current batch 3007
    QTY (Max 25)
  • Search result 9

    Category Number 80
    Pack size 500 mg
    Substance name chloroxylenol
    CAS Number 88-04-0
    Quantitative Yes
    Current batch 1542
    QTY (Max 1)
  • Search result 10

    Category Number 81
    Pack size 100 mg
    Substance name chlorphenamine maleate
    CAS Number 113-92-8
    Quantitative Yes
    Current batch 3219
    QTY (Max 25)
  • Search result 11

    Category Number 856
    Pack size 50 mg
    Substance name chlorpromazine hydrochloride
    CAS Number 69-09-0
    Quantitative No
    Current batch 3010
    QTY (Max 25)
  • Search result 12

    Category Number 467
    Pack size 50 mg
    Substance name chlorpromazine sulfoxide
    CAS Number 969-99-3
    Quantitative No
    Current batch 2914
    QTY (Max 25)
  • Search result 13

    Category Number 491
    Pack size 100 mg
    Substance name chlortalidone
    CAS Number 77-36-1
    Quantitative Yes
    Current batch 3196
    QTY (Max 25)
  • Search result 14

    Category Number 75
    Pack size 25 mg
    Substance name chlortalidone impurity B
    CAS Number 5270-74-6
    Quantitative No
    Current batch 4019
    QTY (Max 25)
  • Search result 15

    Category Number 783
    Pack size 100 mg
    Substance name chlortetracycline hydrochloride
    CAS Number 64-72-2
    Quantitative Yes
    Current batch 4193
    QTY (Max 25)
  • Search result 16

    Category Number 618
    Pack size 100 mg
    Substance name cholic acid
    CAS Number 81-25-4
    Quantitative Yes
    Current batch 4489
    Discontinued
  • Search result 17

    Category Number 475
    Pack size 100 mg
    Substance name cimetidine
    CAS Number 51481-61-9
    Quantitative Yes
    Current batch 3187
    QTY (Max 25)
  • Search result 18

    Category Number 1219
    Pack size 100 mg
    Substance name cinnarizine
    CAS Number 298-57-7
    Quantitative Yes
    Current batch 4032
    QTY (Max 25)
  • Search result 19

    Category Number 1278
    Pack size 100 mg
    Substance name ciprofibrate
    CAS Number Not applicable
    Quantitative Yes
    Current batch 4502
    QTY (Max 25)
  • Search result 20

    Category Number 929
    Pack size 100 mg
    Substance name ciprofloxacin hydrochloride
    CAS Number 86393-32-0
    Quantitative Yes
    Current batch 4225
    QTY (Max 25)
  • Search result 21

    Category Number 930
    Pack size 10 mg
    Substance name ciprofloxacin impurity standard
    CAS Number Not applicable
    Quantitative No
    Current batch 3453
    QTY (Max 25)
  • Search result 22

    Category Number 597
    Pack size 100 mg
    Substance name cis-flupenthixol propionate dihydrochloride
    CAS Number Not applicable
    Quantitative No
    Current batch 2019
    QTY (Max 2)
  • Search result 23

    Category Number 738
    Pack size 25 mg
    Substance name cis-flupentixol
    CAS Number 53772-82-0
    Quantitative No
    Current batch 4213
    QTY (Max 25)
  • Search result 24

    Category Number 809
    Pack size 100 mg
    Substance name cisplatin
    CAS Number 15663-27-1
    Quantitative Yes
    Current batch 4699
    QTY (Max 25)
  • Search result 25

    Category Number 1153
    Pack size 100 mg
    Substance name citalopram hydrobromide
    CAS Number 59729-32-7
    Quantitative Yes
    Current batch 3718
    QTY (Max 25)