• Molecular NameTiotropium
  • SynonymTiotropium bromide
  • Weight392.52
  • Drugbank_IDDB01409
  • ACS_NO186691-13-4
  • Show 3D model
  • LogP (experiment)N/A
  • LogP (predicted, AB/LogP v2.0)-0.93
  • pkaN/A
  • LogD (pH=7, predicted)-0.93
  • Solubility (experiment)N/A
  • LogS (predicted, ACD/Labs)(ph=7)-0.52
  • LogSw (predicted, AB/LogsW2.0)349.66
  • Sw (mg/ml) (predicted, ACD/Labs)118.44
  • No.of HBond Donors1
  • No.of HBond Acceptors5
  • No.of Rotatable Bonds5
  • TPSA124.77
  • StatusFDA approved
  • Administrationinhalation (oral)
  • PharmacologyA long-acting, 24 hour, anticholinergic bronchodilator used in the management of chronic obstructive pulmonary disease (COPD).
  • Absorption_valueN/A
  • Absorption (description)Bioavailability is 19.5% following administration by inhalation. Oral solutions of tiotropium have an absolute bioavailability of 2-3%.
  • Caco_2N/A
  • Bioavailability2.5
  • Protein binding72.0
  • Volume of distribution (VD)32 L/kg
  • Blood/Plasma Partitioning ratio (D_blood)N/A
  • MetabollsmThe extent of biotransformation appears to be small. This is evident from a urinary excretion of 74% of unchanged substance after an intravenous dose to young healthy volunteers. Tiotropium, an ester, is nonenzymatically cleaved to the alcohol N??????methylscopine and dithienylglycolic acid, neither of which bind to muscarinic receptors. In vitro experiments with human liver microsomes and human hepatocytes suggest that a fraction of the administered dose (74% of an intravenous dose is excreted unchanged in the urine, leaving 25% for metabolism) is metabolized by cytochrome P450??????dependent oxidation and subsequent glutathione conjugation to a variety of Phase II metabolites. Via inhibition studies, it is evident that CYP450 2D6 and 3A4 are involved in the metabolic pathway that is responsible for the elimination of a small part of the administered dose.
  • Half life5~6 days
  • ExcretionRenal; 74% of unchanged substance after an intravenous dose to young healthy volunteers.
  • Urinary ExcretionN/A
  • CleranceN/A
  • ToxicityNo mortality was observed at inhalation tiotropium doses up to 32.4 mg/kg in mice, 267.7 mg/kg in rats, and 0.6 mg/kg in dogs. These doses correspond to 7,300, 120,000, and 850 times the recommended human daily dose on a mg/m2 basis, respectively.
  • LD50 (rat)N/A
  • LD50 (mouse)N/A