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Clinical data
Trade names Tinset, others
Synonyms KW-4354; McN-JR 35443; R-35443
AHFS/Drugs.com International Drug Names
Routes of
By mouth
ATC code
Legal status
Legal status
  • In general: ℞ (Prescription only)
CAS Number
PubChem CID
ECHA InfoCard 100.056.637 Edit this at Wikidata
Chemical and physical data
Formula C27H30N4O
Molar mass 426.553 g/mol
3D model (JSmol)
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Oxatomide, sold under the brand name Tinset among others, is a first-generation antihistamine of the diphenylmethylpiperazine family which is marketed in Europe, Japan, and a number of other countries.[1][2][3][4] It was discovered at Janssen Pharmaceutica in 1975.[5] Oxatomide lacks any anticholinergic effects.[2] In addition to its H1 receptor antagonism, it also possesses antiserotonergic activity similarly to hydroxyzine.[2]



Oxatomide synthesis:[6]

Reaction of 2-Benzimidazolinone with isopropenyl acetate leads to the singly protected imidazolone derivative (2). Alkylation of this with 3-chloro-1-bromopropane affords the functionalized derivative (3). Alkylation of the monobenzhydryl derivative of piperazine (4) with 3 gives oxatomide (5), after hydrolytic removal of the protecting group.


  1. ^ J. Elks (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 912–. ISBN 978-1-4757-2085-3. 
  2. ^ a b c Ohmori K, Ishii H, Nito M, Shuto K, Nakamizo N (May 1983). "[Pharmacological studies on oxatomide (KW-4354). (7) Antagonistic effects on chemical mediators]". Nippon Yakurigaku Zasshi. Folia Pharmacologica Japonica (in Japanese). 81 (5): 399–409. doi:10.1254/fpj.81.399. PMID 6138301. 
  3. ^ Index Nominum 2000: International Drug Directory. Taylor & Francis. 2000. pp. 768–. ISBN 978-3-88763-075-1. 
  4. ^ https://www.drugs.com/international/oxatomide.html
  5. ^ Harry Schwartz (August 1989). Breakthrough: the discovery of modern medicines at Janssen. Skyline Pub. Group. p. 149. ISBN 978-1-56019-100-1. 
  6. ^ J. Vandenberk et al., DE 2714437 ; eidem, U.S. Patent 4,250,176 (1977, 1981 both to Janssen).