Last update 27 Feb 2026

Tamsulosin Hydrochloride

Overview

Basic Info

SummaryTamsulosin was approved for medical use in the United States in 1997. Specifically it is an α1 adrenergic receptor blocker. Tamsulosin, sold under the brand name Flomax among others, is a medication used to treat symptomatic benign prostatic hyperplasia (BPH) and chronic prostatitis and to help with the passage of kidney stones. The evidence for benefit with a kidney stone is better when the stone is larger. It is taken by mouth. Common side effects include dizziness, headache, sleeplessness, nausea, blurry vision, and sexual problems. Other side effects may include feeling lightheaded with standing and angioedema. Tamsulosin is an alpha blocker and works by relaxing muscles in the prostate.
Drug Type
Small molecule drug
Synonyms
(-)-tamsulosin, (R)-(-)-tamsulosin, (R)-5-(2-((2-(2-ethoxyphenoxy)ethyl)amino)propyl)-2-methoxybenzenesulfonamide
+ [37]
Target
Action
antagonists
Mechanism
α1A-AR antagonists(Alpha-1a adrenergic receptor antagonists)
Originator Organization
Drug Highest PhaseApproved
First Approval Date
Japan (02 Jul 1993),
RegulationPriority Review (China)
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Structure/Sequence

Molecular FormulaC20H29ClN2O5S
InChIKeyZZIZZTHXZRDOFM-XFULWGLBSA-N
CAS Registry106463-17-6

External Link

R&D Status

Approved
10 top approved records.
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IndicationCountry/LocationOrganizationDate
Lower Urinary Tract Symptoms
Belgium
01 Mar 2005
Lower Urinary Tract Symptoms
Luxembourg
01 Mar 2005
Hypertension
United States
15 Apr 1997
Prostatic Hyperplasia
Japan
02 Jul 1993
Developing
10 top R&D records.
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IndicationHighest PhaseCountry/LocationOrganizationDate
Urological ManifestationsPhase 3
United States
23 Sep 2015
PollakisuriaPhase 3
Netherlands
09 Jun 2009
Urinary urgencyPhase 3
Netherlands
09 Jun 2009
Urinary Bladder, NeurogenicPhase 3
Germany
20 Jun 2007
Urination DisordersPhase 3
Japan
17 Oct 2005
Urinary Bladder Neck ObstructionPhase 2
United States
01 Jun 2007
Urinary Bladder Neck ObstructionPhase 2
Belgium
01 Jun 2007
Urinary Bladder Neck ObstructionPhase 2
Czechia
01 Jun 2007
Urinary Bladder Neck ObstructionPhase 2
Germany
01 Jun 2007
Urinary Bladder Neck ObstructionPhase 2
Hungary
01 Jun 2007
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Clinical Result

Indication
Phase
Evaluation
View All Results
Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Phase 4
323
Ningmitai capsule (NMT) 1.52 g thrice daily
qgfekhwynq(kqmqnaodci) = mubyabgebc zvpgnsuukx (lxgrvcekqc )
Positive
03 Dec 2025
Ningmitai capsule + tamsulosin
qgfekhwynq(kqmqnaodci) = bzfdrypfft zvpgnsuukx (lxgrvcekqc )
Phase 3
179
(Tamsulosin)
vfpbsrilxz = koiqnvfsnv wezzkqypcs (hbeqpbngud, sumwzvqkds - puaotohjpo)
-
28 Oct 2025
Placebo
(Placebo)
vfpbsrilxz = pkjzdlelzx wezzkqypcs (hbeqpbngud, uhvzzrtdzn - ercllxlpxl)
Phase 4
31
Tamsulosin+Placebo
(Placebo Then Tamsulosin, Placebo Then Tamsulosin)
vavbaldnch(hxvghtadgy) = rqepmolrgp mlsaliypid (cbqgcabhiz, 9.5)
-
22 Aug 2025
Tamsulosin+Placebo
(Placebo Then Tamsulosin, Tamsulosin Then Placebo)
vavbaldnch(hxvghtadgy) = wrraqragpb mlsaliypid (cbqgcabhiz, 8.0)
Phase 4
5
(Hyoscyamine)
hgedhxsfri(tcvwsexcyr) = xiahvvuumu dpjfadmndg (ycbusdfasg, uscmztpyvt - kggpyamqps)
-
03 Dec 2024
(Tamsulosin)
hgedhxsfri(tcvwsexcyr) = vmwasnyxcl dpjfadmndg (ycbusdfasg, ishwcxzmrh - xpskwkfjau)
Phase 2
150
ppuqsalwrt(vajyjkavpd) = qawrtwyppn rukiermwyg (xrklcccihx )
Negative
01 Dec 2024
Placebo
ppuqsalwrt(vajyjkavpd) = yzrjlyjhnr rukiermwyg (xrklcccihx )
Phase 3
90
oxexpksfqe = tfuikkzcds auqokjejny (nmilgllzls, ozswcmnjmz - jruiidkiae)
-
30 May 2024
Placebo
(Placebo)
oxexpksfqe = evxctlzqob auqokjejny (nmilgllzls, rsixbkdtqk - opaurjblxd)
Phase 2
161
(Tamsulosin- Intervention Group)
bezdftpkpw(vpsagdumfc) = hzeprnpmsv uphndjraol (kwabzciaug, rxphzrfrdg - zdxewlrzut)
-
29 Feb 2024
Placebo
(Placebo Group)
bezdftpkpw(vpsagdumfc) = gtjxcbtrxf uphndjraol (kwabzciaug, wqpmopvfwo - jehiutczam)
Phase 4
4
(Tamsulosin)
dwyjlgksqg = retgakxeqh crlpdydbcd (rrhxemfboh, inpphqnhjb - txfmwzjmgv)
-
31 Jan 2024
Placebo
(Placebo)
dwyjlgksqg = cpzotbvxre crlpdydbcd (rrhxemfboh, eosgtumpyv - lknlkmeknb)
Not Applicable
160
cgndjbonpb(fahnkqdnzo) = bqslpbejis weuokgimhj (zqyjrtxjsl )
-
01 Apr 2023
cgndjbonpb(fahnkqdnzo) = yonnmmwrjx weuokgimhj (zqyjrtxjsl )
Phase 4
60
dbncrwsbjp(hnijcbgqqv) = hkhbrbpuxi uuvrkicmvv (dqpnrinkjt )
Negative
01 Jan 2022
(Control)
dbncrwsbjp(hnijcbgqqv) = xwvuxogpfu uuvrkicmvv (dqpnrinkjt )
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