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Diphenhydramine hydrochloride

Pharmaceutical Secondary Standard; Certified Reference Material

N-(2-Diphenylmethoxyethyl)-N,N-dimethylamine hydrochloride, DP, 2-Diphenylmethoxy-N,N-dimethylethylamine hydrochloride, DPH
Empirical Formula (Hill Notation):
C17H21NO · HCl
CAS Number:
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level


certified reference material
pharmaceutical secondary standard


current certificate can be downloaded


HPLC: suitable
gas chromatography (GC): suitable


pharmaceutical (small molecule)



pharmacopeia traceability

traceable to BP 896
traceable to PhEur D2000000
traceable to USP 1218005

storage temp.


SMILES string




InChI key


Gene Information

human ... HRH1(3269)

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General description

Pharmaceutical secondary standards for application in quality control, provide pharma laboratories and manufacturers with a convenient and cost-effective alternative to the preparation of in-house working standards.


These Secondary Standards are qualified as Certified Reference Materials. These are suitable for use in several analytical applications including but not limited to pharma release testing, pharma method development for qualitative and quantitative analyses, food and beverage quality control testing, and other calibration requirements.
Diphenhydramine hydrochloride may be used as a pharmaceutical reference standard for the determination of the analyte in pharmaceutical formulations by various chromatography techniques.

Analysis Note

These secondary standards offer multi-traceability to the USP, EP (PhEur) and BP primary standards, where they are available.

Other Notes

This Certified Reference Material (CRM) is produced and certified in accordance with ISO 17034 and ISO/IEC 17025. All information regarding the use of this CRM can be found on the certificate of analysis.


To see an example of a Certificate of Analysis for this material enter LRAB7790 in the slot below. This is an example certificate only and may not be the lot that you receive.


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Hazard Statements

Hazard Classifications

Acute Tox. 4 Oral

Storage Class Code

13 - Non Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

Quantitative analysis of liquid formulations using FT-Raman spectroscopy and HPLC: The case of diphenhydramine hydrochloride in [TM="Benadryl"]
Orkoula MG, et al.
Journal of Pharmaceutical and Biomedical Analysis, 41(4), 1406-1411 (2006)
Optimization and validation of a method for the determination of caffeine, 8-chlorotheophylline and diphenhydramine by isocratic high-performance liquid chromatography: Stress test for stability evaluation
Barbas C, et al.
Journal of Chromatography A, 870(1), 97-103 (2000)
Development and validation of a capillary electrophoresis method for the determination of codeine, diphenhydramine, ephedrine and noscapine in pharmaceuticals
Gomez MR, et al.
Il Farmaco (Societa Chimica Italiana : 1989), 60(1), 85-90 (2005)
Analysis of pharmaceutical preparations containing antihistamine drugs by micellar liquid chromatography
Martinez-Algaba C, et al.
Journal of Pharmaceutical and Biomedical Analysis, 40(2), 312-321 (2006)
Manoj Reddy Medapati et al.
International journal of molecular sciences, 22(18) (2021-09-29)
Bitter-taste receptors (T2Rs) have emerged as key players in host-pathogen interactions and important modulators of oral innate immunity. Previously, we reported that T2R14 is expressed in gingival epithelial cells (GECs) and interacts with competence stimulating peptides (CSPs) secreted by the

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