moleculefinder

Tamsulosin

C20H28N2O5S408.5 g/mol Calculated

Also called Alna, Josir and Omnic.

A medicine sold as Flomax that relaxes the muscle of the prostate and bladder neck, used for the urinary symptoms of an enlarged prostate.

Sources and notes
  • The introductionfrom sourceMoleculeFinder curated
  • Other namesfrom sourcePubChem / Wikidata
  • Formula and weightcomputedPubChem
  • 2D drawingcomputedPubChem structure, drawn by RDKit
  • 3D modelfrom sourcePubChem 3D conformerLoaded after the page has painted, and on a phone only when you ask for it; the 2D drawing shows until it arrives.

Where you encounter it

Dispensed on prescription, not sold on a shelf.

Sources and notes
  • The line abovefrom sourceMoleculeFinder curatedFrom the group the molecule belongs to.

Explore its structure

Choose a part to light it up.

A sulfur carrying two oxygens and a nitrogen, written SO2N. It is a polar, sturdy group, the one the sulfa drugs are named for.

From: standard chemistry.

Sources and notes
  • The drawingcomputedPubChem structure, drawn by RDKitThe page's one shipped drawing, with the chosen part lit in amber under it.
  • The partscomputedFound by ruleEach part is found by a chemical pattern, never picked by hand atom by atom; its words say where they come from.

Properties and sources

Calculated by PubChem

Molecular formula
C20H28N2O5S
Molecular weight
408.5 g/mol
XLogP3octanol/water, log units
2.7
Polar surface areatopological
108 Ų
H-bond donors
2
H-bond acceptors
7
Rotatable bonds
11
Complexity
539

Reported Licence

The US Food and Drug Administration licenses Tamsulosin for human use (ANDA 090377, authorized March 2, 2010). Drugs@FDA

Groups it belongs to

Category
Prescription medicine
Chemical groups
Amines, Aromatics, Ethers
Elements
Nitrogen, Sulfur
SMILESCCOC1=CC=CC=C1OCCN[C@H](C)CC2=CC(=C(C=C2)OC)S(=O)(=O)N

PubChem CID 129211 · Wikidata Q418480 · InChIKey DRHKJLXJIQTDTD-OAHLLOKOSA-N · Data refreshed

How MoleculeFinder sources and labels its data

Questions
What is Tamsulosin?
A medicine sold as Flomax that relaxes the muscle of the prostate and bladder neck, used for the urinary symptoms of an enlarged prostate.
What kind of molecule is Tamsulosin?
Tamsulosin has the formula C20H28N2O5S and a molecular weight of 408.5 g/mol. MoleculeFinder files it in the prescription medicine group. from sourcefrom sourcefrom source
Who licenses Tamsulosin as a medicine?
The US Food and Drug Administration licenses Tamsulosin for human use (ANDA 090377, authorized March 2, 2010). from source
Sources and notes
  • Calculated valuescomputedPubChemComputed from the structure, so no laboratory conditions apply; complexity is PubChem's own structural score.
  • Licencefrom sourceDrugs@FDARead 2026-10-21.
  • Data refreshedfrom sourceMoleculeFinder2026-11-09