U.S. Department of Health & Human Services Divider Arrow National Institutes of Health Divider Arrow NCATS

Details

Stereochemistry ABSOLUTE
Molecular Formula C25H32F3N3O4
Molecular Weight 495.5345
Optical Activity UNSPECIFIED
Defined Stereocenters 1 / 1
E/Z Centers 0
Charge 0

SHOW SMILES / InChI
Structure of SILODOSIN

SMILES

C[C@H](CC1=CC(C(N)=O)=C2N(CCCO)CCC2=C1)NCCOC3=CC=CC=C3OCC(F)(F)F

InChI

InChIKey=PNCPYILNMDWPEY-QGZVFWFLSA-N
InChI=1S/C25H32F3N3O4/c1-17(30-8-12-34-21-5-2-3-6-22(21)35-16-25(26,27)28)13-18-14-19-7-10-31(9-4-11-32)23(19)20(15-18)24(29)33/h2-3,5-6,14-15,17,30,32H,4,7-13,16H2,1H3,(H2,29,33)/t17-/m1/s1

HIDE SMILES / InChI
Silodosin is a selective antagonsit of alpha-1a adrenergic receptor which was developed by Kissei Pharmaceutical. The drug was approved by FDA under the name Rapaflo for the treatment of signs and symptoms associated with benign prostatic hyperplasia.

Approval Year

Targets

Targets

Primary TargetPharmacologyConditionPotency
0.32 nM [IC50]
Conditions

Conditions

ConditionModalityTargetsHighest PhaseProduct
Palliative
RAPAFLO

Approved Use

RAPAFLO, a selective alpha-1 adrenergic receptor antagonist, is indicated for the treatment of the signs and symptoms of benign prostatic hyperplasia (BPH).

Launch Date

2008
Cmax

Cmax

ValueDoseCo-administeredAnalytePopulation
61.6 ng/mL
8 mg 1 times / day steady-state, oral
dose: 8 mg
route of administration: Oral
experiment type: STEADY-STATE
co-administered:
SILODOSIN plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: UNKNOWN
AUC

AUC

ValueDoseCo-administeredAnalytePopulation
373.4 ng × h/mL
8 mg 1 times / day steady-state, oral
dose: 8 mg
route of administration: Oral
experiment type: STEADY-STATE
co-administered:
SILODOSIN plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: UNKNOWN
T1/2

T1/2

ValueDoseCo-administeredAnalytePopulation
13.3 h
8 mg 1 times / day steady-state, oral
dose: 8 mg
route of administration: Oral
experiment type: STEADY-STATE
co-administered:
SILODOSIN plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: UNKNOWN
Funbound

Funbound

ValueDoseCo-administeredAnalytePopulation
3%
8 mg 1 times / day steady-state, oral
dose: 8 mg
route of administration: Oral
experiment type: STEADY-STATE
co-administered:
SILODOSIN plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: UNKNOWN
Doses

Doses

DosePopulationAdverse events​
48 mg 1 times / day multiple, oral
Highest studied dose
Dose: 48 mg, 1 times / day
Route: oral
Route: multiple
Dose: 48 mg, 1 times / day
Sources:
healthy, 19 - 45
n = 6
DLT: Postural hypotension...
12 mg single, oral
Highest studied dose
Dose: 12 mg
Route: oral
Route: single
Dose: 12 mg
Sources: Page: p.1242
healthy, 23 ± 1.4
n = 8
Health Status: healthy
Age Group: 23 ± 1.4
Sex: M
Population Size: 8
Sources: Page: p.1242
Other AEs: Nervous system disorder NOS, Fatigue...
Other AEs:
Nervous system disorder NOS (13%)
Fatigue (13%)
Dizziness (13%)
Hematuria (13%)
Leukocyturia (13%)
Sources: Page: p.1242
8 mg 1 times / day multiple, oral
Recommended
unhealthy
n = 466
Disc. AE: Retrograde ejaculation...
8 mg 1 times / day multiple, oral
Recommended
Dose: 8 mg, 1 times / day
Route: oral
Route: multiple
Dose: 8 mg, 1 times / day
Sources: Page: p.3
unhealthy
Health Status: unhealthy
Condition: Benign prostatic hyperplasia
Sex: M
Sources: Page: p.3
Other AEs: Intraoperative floppy iris syndrome...
AEs

AEs

AESignificanceDosePopulation
Postural hypotension DLT
48 mg 1 times / day multiple, oral
Highest studied dose
Dose: 48 mg, 1 times / day
Route: oral
Route: multiple
Dose: 48 mg, 1 times / day
Sources:
healthy, 19 - 45
n = 6
Dizziness 13%
12 mg single, oral
Highest studied dose
Dose: 12 mg
Route: oral
Route: single
Dose: 12 mg
Sources: Page: p.1242
healthy, 23 ± 1.4
n = 8
Health Status: healthy
Age Group: 23 ± 1.4
Sex: M
Population Size: 8
Sources: Page: p.1242
Fatigue 13%
12 mg single, oral
Highest studied dose
Dose: 12 mg
Route: oral
Route: single
Dose: 12 mg
Sources: Page: p.1242
healthy, 23 ± 1.4
n = 8
Health Status: healthy
Age Group: 23 ± 1.4
Sex: M
Population Size: 8
Sources: Page: p.1242
Hematuria 13%
12 mg single, oral
Highest studied dose
Dose: 12 mg
Route: oral
Route: single
Dose: 12 mg
Sources: Page: p.1242
healthy, 23 ± 1.4
n = 8
Health Status: healthy
Age Group: 23 ± 1.4
Sex: M
Population Size: 8
Sources: Page: p.1242
Leukocyturia 13%
12 mg single, oral
Highest studied dose
Dose: 12 mg
Route: oral
Route: single
Dose: 12 mg
Sources: Page: p.1242
healthy, 23 ± 1.4
n = 8
Health Status: healthy
Age Group: 23 ± 1.4
Sex: M
Population Size: 8
Sources: Page: p.1242
Nervous system disorder NOS 13%
12 mg single, oral
Highest studied dose
Dose: 12 mg
Route: oral
Route: single
Dose: 12 mg
Sources: Page: p.1242
healthy, 23 ± 1.4
n = 8
Health Status: healthy
Age Group: 23 ± 1.4
Sex: M
Population Size: 8
Sources: Page: p.1242
Retrograde ejaculation 2.8%
Disc. AE
8 mg 1 times / day multiple, oral
Recommended
unhealthy
n = 466
Intraoperative floppy iris syndrome
8 mg 1 times / day multiple, oral
Recommended
Dose: 8 mg, 1 times / day
Route: oral
Route: multiple
Dose: 8 mg, 1 times / day
Sources: Page: p.3
unhealthy
Health Status: unhealthy
Condition: Benign prostatic hyperplasia
Sex: M
Sources: Page: p.3
OverviewDrug as perpetrator​

Drug as perpetrator​

TargetModalityActivityMetaboliteClinical evidence
no
no
no
no
no
no
no
no
no
no
no
no
no
no (co-administration study)
Comment: silodosin did not significantly affect the PK of digoxin
Page: 5.0
Drug as victim

Drug as victim

TargetModalityActivityMetaboliteClinical evidence
no
no
no
no
no
no
no
no (co-administration study)
Comment: furafylline did not affect silodosin metabolism
Page: 16.0
no
no (co-administration study)
Comment: furafylline did not affect silodosin metabolism
Page: 16.0
no
no (co-administration study)
Comment: coumarin did not affect silodosin metabolism
Page: 16.0
no
no (co-administration study)
Comment: S-mephenytoin did not affect silodosin metabolism
Page: 16.0
no
no (co-administration study)
Comment: sulfafenazole did not affect silodosin metabolism
Page: 16.0
no
no (co-administration study)
Comment: quinidine did not affect silodosin metabolism
Page: 16.0
no
no (co-administration study)
Comment: diethyldithiocarbamate did not affect silodosin metabolism
Page: 16.0
yes
yes
yes (co-administration study)
Comment: ketaconzaole increased sildosin Cmax by 3.8-fold and AUC by 3.2-fold
Page: 5, 11, 12
yes
yes (co-administration study)
Comment: ketaconzaole increased sildosin Cmax by 3.8-fold and AUC by 3.2-fold
Page: 17.0
Tox targets

Tox targets

TargetModalityActivityMetaboliteClinical evidence
Sourcing

Sourcing

Vendor/AggregatorIDURL
PubMed

PubMed

TitleDatePubMed
KMD-3213, a novel, potent, alpha 1a-adrenoceptor-selective antagonist: characterization using recombinant human alpha 1-adrenoceptors and native tissues.
1995 Aug
Effects of KMD-3213, a uroselective alpha 1A-adrenoceptor antagonist, on the tilt-induced blood pressure response in normotensive rats.
2002 Oct
KMD 3213: KAD 3213, silodosin.
2004
Carvedilol selectively inhibits oscillatory intracellular calcium changes evoked by human alpha1D- and alpha1B-adrenergic receptors.
2004 Sep 1
[Pharmacokinetic profile of silodosin in clinical practice].
2006 Mar
[Pharmacokinetics and disposition of silodosin (KMD-3213)].
2006 Mar
Search for new alpha1a-adrenoceptor-selective antagonist for treating lower urinary tract symptoms associated with benign prostatic hyperplasia.
2007 Apr
Alpha1-adrenoceptors and ejaculatory function.
2007 Oct
Different affinities of native alpha1B-adrenoceptors for ketanserin between intact tissue segments and membrane preparations.
2008 Apr 28
[Multi-center trial on the early effects of silodosin on lower urinary tract symptoms associated with benign prostatic hyperplasia].
2008 Dec
Gateways to clinical trials.
2008 Jun
The involvement of urothelial alpha1A adrenergic receptor in controlling the micturition reflex.
2008 Oct
Early efficacy of silodosin in patients with lower urinary tract symptoms suggestive of benign prostatic hyperplasia.
2008 Oct
Ejaculatory dysfunction caused by the new alpha1-blocker silodosin: A preliminary study to analyze human ejaculation using color Doppler ultrasonography.
2008 Oct
Computational studies of the binding site of alpha1A-adrenoceptor antagonists.
2008 Oct
Effects of four different alpha(1)-adrenoceptor antagonists on alpha-adrenoceptor agonist-induced contractions in isolated mouse and hamster ureters.
2009 Aug
Efficacy of silodosin for relieving benign prostatic obstruction: prospective pressure flow study.
2009 Dec
Gene expressions and mechanical functions of α1-adrenoceptor subtypes in mouse ureter.
2009 Dec
Silodosin (Rapaflo) for benign prostatic hyperplasia.
2009 Jan 12
Short- and long-term effects of silodosin, a selective alpha 1A-adrenoceptor antagonist, on ejaculatory function in rats.
2009 Jun
New drugs: milnacipran hydrochloride, fesoterodine fumarate, and silodosin.
2009 Mar-Apr
Determination of silodosin in human plasma by liquid chromatography-tandem mass spectrometry.
2009 Nov 1
Effects of silodosin and naftopidil on the distal ureter and cardiovascular system in anesthetized dogs: comparison of potential medications for distal ureteral stone passage.
2010 Jan
Gateways to clinical trials.
2010 Jul-Aug
(RS)-1-(1-Acetyl-indolin-5-yl)-2-chloro-propan-1-one.
2010 Jun 9
Effects of the selective alpha 1a-adrenoceptor antagonist silodosin on ECGs of healthy men in a randomized, double-blind, placebo- and moxifloxacin-controlled study.
2010 May
Gateways to clinical trials.
2010 Nov
Selective α1A-blocker improves bladder storage function in rats via suppression of C-fiber afferent activity.
2010 Oct
Silodosin in the treatment of benign prostatic hyperplasia.
2010 Oct 27
Patents

Sample Use Guides

The recommended dose is 8 mg orally once daily with a meal. The dose can be reduced to 4 mg for those with moderate renal impairment.
Route of Administration: Oral
In Vitro Use Guide
Sources: www.ncbi.nlm.nih.gov/pubmed/23226423
Human prostate tissue were treated with silodosin at 3 uM added 15 min before application of noradrenaline (30 uM) to study the inhibition of noradrenaline-activated Transcription Factors Elk1 and SRF.
Name Type Language
SILODOSIN
DASH   EMA EPAR   INN   JAN   MART.   MI   ORANGE BOOK   VANDF   WHO-DD  
INN  
Official Name English
RAPAFLO
Brand Name English
SILODOSIN [ORANGE BOOK]
Common Name English
KSO-0400
Common Name English
URIEF
Brand Name English
SILODOSIN [EMA EPAR]
Common Name English
(-)-1-(3-HYDROXYPROPYL)-5-((2R)-2-((2-(2-(2,2,2-TRIFLUOROETHOXY)PHENOXY)ETHYL)AMINO)PROPYL)-2,3-DIHYDRO-1H-INDOLE-7-CARBOXAMIDE
Systematic Name English
2,3-DIHYDRO-1-(3-HYDROXYPROPYL)-5-((2R)-2-((2-(2-(2,2,2-TRIFLUOROETHOXY)PHENOXY)ETHYL)AMINO)PROPYL)-1H-INDOLE-7-CARBOXAMIDE
Systematic Name English
KAD-3213
Code English
SILODOSIN [JAN]
Common Name English
silodosin [INN]
Common Name English
SILODOSIN [MI]
Common Name English
SILODYX
Brand Name English
RAPILIF
Brand Name English
SILODOSIN [VANDF]
Common Name English
Silodosin [WHO-DD]
Common Name English
KMD-3213
Code English
SILODAL
Brand Name English
SILODOSIN [MART.]
Common Name English
UROREC
Brand Name English
Classification Tree Code System Code
EMA ASSESSMENT REPORTS UROREC (AUTHORIZED: PROSTATIC HYPERPLASIA)
Created by admin on Fri Dec 15 15:49:12 GMT 2023 , Edited by admin on Fri Dec 15 15:49:12 GMT 2023
NDF-RT N0000175553
Created by admin on Fri Dec 15 15:49:12 GMT 2023 , Edited by admin on Fri Dec 15 15:49:12 GMT 2023
WHO-ATC G04CA04
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LIVERTOX NBK548170
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NCI_THESAURUS C29713
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NDF-RT N0000000099
Created by admin on Fri Dec 15 15:49:12 GMT 2023 , Edited by admin on Fri Dec 15 15:49:12 GMT 2023
EMA ASSESSMENT REPORTS SILODYX (AUTHORIZED: PROSTATIC HYPERPLASIA)
Created by admin on Fri Dec 15 15:49:12 GMT 2023 , Edited by admin on Fri Dec 15 15:49:12 GMT 2023
WHO-VATC QG04CA04
Created by admin on Fri Dec 15 15:49:12 GMT 2023 , Edited by admin on Fri Dec 15 15:49:12 GMT 2023
Code System Code Type Description
SMS_ID
100000090781
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PRIMARY
EPA CompTox
DTXSID40167045
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DRUG CENTRAL
4151
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PRIMARY
INN
8043
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DRUG BANK
DB06207
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PRIMARY
CAS
160970-54-7
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PRIMARY
DAILYMED
CUZ39LUY82
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RXCUI
720825
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PRIMARY RxNorm
MERCK INDEX
m9912
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PRIMARY Merck Index
WIKIPEDIA
SILODOSIN
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PRIMARY
NCI_THESAURUS
C81372
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PRIMARY
EVMPD
SUB23152
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PRIMARY
FDA UNII
CUZ39LUY82
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PRIMARY
ChEMBL
CHEMBL24778
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PRIMARY
IUPHAR
493
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PUBCHEM
5312125
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