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.

73 items
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  • Search result 1

    Category Number 769
    Pack size 20 mg
    Substance name paeoniflorin
    Declared content
    88.6% of C23H28O11
    Current batch 3571
    E-mail to order:  bpcrs@mhra.gov.uk
  • Search result 2

    Category Number 1165
    Pack size 100 mg
    Substance name palmatine chloride
    Declared content
    79.1% of C21H22CINO4
    Current batch 4200
    QTY (Max 25)
  • Search result 3

    Category Number 276
    Pack size 25 mg
    Substance name pancuronium bromide
    Declared content
    92.2% of C35H60Br2N2O4
    Current batch 3863
    Out of Stock
  • Search result 4

    Category Number 1198
    Pack size 25 mg
    Substance name pantoprazole impurity A
    Declared content Not applicable
    Current batch 3903
    QTY (Max 25)
  • Search result 5

    Category Number 1197
    Pack size 100 mg
    Substance name pantoprazole sodium
    Declared content
    88.4% of C16H14F2N3O4S
    Current batch 3902
    QTY (Max 25)
  • Search result 6

    Category Number 277
    Pack size 100 mg
    Substance name papaverine hydrochloride
    Declared content
    90.0% of C20H21NO4
    99.7% of C20H21NO4,HCl
    Current batch 2715
    QTY (Max 25)
  • Search result 7

    Category Number 371
    Pack size 100 mg
    Substance name paracetamol
    Declared content
    99.8% of C8H9NO2
    Current batch 4436
    QTY (Max 25)
  • Search result 8

    Category Number 1024
    Pack size 200 mg
    Substance name paroxetine hydrochloride hemihydrate
    Declared content
    97.4% of C19H20FNO3,HCl
    Current batch 3241
    QTY (Max 25)
  • Search result 9

    Category Number 746
    Pack size 25 mg
    Substance name paroxetine impurity standard
    Declared content Not applicable
    Current batch 4468
    QTY (Max 25)
  • Search result 10

    Category Number 278
    Pack size 5 mg
    Substance name pentagastrin
    Declared content Not applicable
    Current batch 3204
    QTY (Max 25)
  • Search result 11

    Category Number 1073
    Pack size 100 mg
    Substance name perindopril erbumine
    Declared content
    99.7% of C23H43N3O5
    Current batch 4167
    QTY (Max 25)
  • Search result 12

    Category Number 1074
    Pack size 25 mg
    Substance name perindopril impurity standard
    Declared content Not applicable
    Current batch 3444
    QTY (Max 25)
  • Search result 13

    Category Number 422
    Pack size 100 mg
    Substance name perphenazine
    Declared content
    99.9% of C21H26ClN3OS
    Current batch 2627
    Discontinued
  • Search result 14

    Category Number 683
    Pack size 100 mg
    Substance name pethidine hydrochloride
    Declared content
    99.8% C15H21NO2,HCl
    Current batch 4390
    Out of Stock
  • Search result 15

    Category Number 1166
    Pack size 100 mg
    Substance name phenelzine sulfate
    Declared content
    99.4 % of C8H12N2,H2SO4
    Current batch 4704
    QTY (Max 25)
  • Search result 16

    Category Number 1208
    Pack size 100 mg
    Substance name phenindione
    Declared content
    97.3% of C15H10O2
    Current batch 3962
    QTY (Max 25)
  • Search result 17

    Category Number 1209
    Pack size 25 mg
    Substance name phenindione impurity 1
    Declared content Not applicable
    Current batch 4118
    QTY (Max 25)
  • Search result 18

    Category Number 901
    Pack size 100 mg
    Substance name phenobarbital
    Declared content
    99.5% of C12H12N2O3
    Current batch 3224
    Out of Stock
  • Search result 19

    Category Number 1072
    Pack size 100 mg
    Substance name phenoxybenzamine hydrochloride
    Declared content
    97.0% of C18H22CINO, HCl
    Current batch 3399
    QTY (Max 25)
  • Search result 20

    Category Number 282
    Pack size 500 mg
    Substance name phenoxymethylpenicillin potassium
    Declared content
    89.2 % of C16H18N2O5S
    Current batch 3113
    QTY (Max 25)
  • Search result 21

    Category Number 1099
    Pack size 25 mg
    Substance name phentolamine impurity standard
    Declared content Not applicable
    Current batch 3672
    QTY (Max 25)
  • Search result 22

    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 23

    Category Number 1026
    Pack size 25 mg
    Substance name phenylacetic acid
    Declared content Not applicable
    Current batch 3357
    QTY (Max 25)
  • Search result 24

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

    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 26

    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 27

    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 28

    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 29

    Category Number 1247
    Pack size 100 mg
    Substance name pimobendan
    Declared content
    99.5% of C19H18N4O2
    Current batch 4126
    QTY (Max 25)
  • Search result 30

    Category Number 682
    Pack size 100 mg
    Substance name pimozide
    Declared content
    99.5% of C28H29F2N3O
    Current batch 2256
    QTY (Max 25)
  • Search result 31

    Category Number 1298
    Pack size 100mg
    Substance name pioglitazone hydrochloride
    Declared content
    100.0% of C19H21CIN2O3S
    Current batch 4620
    QTY (Max 25)
  • Search result 32

    Category Number 1027
    Pack size 100 mg
    Substance name piperacillin
    Declared content
    92.3% of C23H29N5O8S
    Current batch 4583
    QTY (Max 25)
  • Search result 33

    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 34

    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 35

    Category Number 463
    Pack size 100 mg
    Substance name piroxicam
    Declared content
    99.3 % of C15H13N3O4S
    Current batch 4404
    QTY (Max 25)
  • Search result 36

    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 37

    Category Number 288
    Pack size 100 mg
    Substance name poldine metilsulfate
    Declared content
    99.0% of C22H29NO7S
    Current batch 2432
    Discontinued
  • Search result 38

    Category Number 1028
    Pack size 100 mg
    Substance name polymyxin B sulfate
    Declared content Not applicable
    Current batch 4128
    QTY (Max 25)
  • Search result 39

    Category Number 289
    Pack size 100 mg
    Substance name polythiazide
    Declared content
    98.5% of C11H13ClF3N3O4S3
    Current batch 1449
    QTY (Max 25)
  • Search result 40

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