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In the US, Diphenhydramine (diphenhydramine topical) is a member of the following drug classes: anticholinergic antiemetics, anticholinergic antiparkinson agents, antihistamines, miscellaneous anxiolytics, sedatives and hypnotics and is used to treat Allergic Reactions, Allergic Rhinitis, Cold Symptoms, Cough, Extrapyramidal Reaction, Insomnia, Motion Sickness, Nausea/Vomiting, Pruritus and Urticaria.

US matches:

UK matches:



ATC (Anatomical Therapeutic Chemical Classification)


CAS registry number (Chemical Abstracts Service)


Chemical Formula


Molecular Weight


Therapeutic Categories

Antiemetic agent

Sedative agent

Histamine H₁-receptor antagonist (H₁-antihistaminic)

Chemical Name

2-Benzhydryloxyetyldimetylamine (BAN)

Foreign Names

  • Diphenhydraminum (Latin)
  • Diphenhydramin (German)
  • Diphénhydramine (French)
  • Difenhidramina (Spanish)

Generic Names

Brand Names


BANBritish Approved Name
BANMBritish Approved Name (Modified)
DCFDénomination Commune Française
DCITDenominazione Comune Italiana
ISInofficial Synonym
JANJapanese Accepted Name
OSOfficial Synonym
PHPharmacopoeia Name
Rec.INNRecommended International Nonproprietary Name (World Health Organization)

Click for further information on drug naming conventions and International Nonproprietary Names.

Important Notice: The international database is in BETA release. This means it is still under development and may contain inaccuracies. It is not intended as a substitute for the expertise and judgement of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that the use of any medication in any country is safe, appropriate or effective for you. Consult with your healthcare professional before taking any medication.