Ketotifen

Overview

Ketotifen is an organic heterotricyclic compound that is 4,9-dihydro-10H-benzo[4,5]cyclohepta[1,2-b]thiophen-10-one which is substituted at position 4 by a 1-methylpiperidin-4-ylidene group. It has a role as a H1-receptor antagonist and an anti-asthmatic drug. It is a member of piperidines, an organic heterotricyclic compound, an organosulfur heterocyclic compound, a cyclic ketone, a tertiary amino compound and an olefinic compound. It is a conjugate base of a ketotifen(1+).

Source: ChEBI (CC BY 4.0), via PubChem.

PubChem record

CID 3827 · Ketotifen

Molecular formula · weight

C19H19NOS · 309.4 g/mol

PubMed papers naming it (title/abstract)

1,594 search: “Ketotifen”

Registered clinical studies (ClinicalTrials.gov)

40 intervention: “Ketotifen”

Reference facts checked 2026-11-09. Counts are search results, not a judgement of the evidence.