Silodosin

Silodosin
Clinical data

Pregnancy category	US: B (No risk in non-human studies) Not approved for use in women
Routes of administration	Oral
ATC code	G04CA04 (WHO)
Legal status
Legal status	℞ (Prescription only)
Pharmacokinetic data
Bioavailability	32%
Protein binding	97%
Metabolism	Hepatic glucuronidation (UGT2B7-mediated); also minor CYP3A4 involvement
Biological half-life	13±8 hours
Excretion	Renal and fecal
Identifiers
IUPAC name 1-(3-hydroxypropyl)-5-[(2R)-({2-[2-[2-(2,2,2-trifluoroethoxy)phenoxy]ethyl}amino)propyl]indoline-7-carboxamide
Synonyms	KAD-3213, KMD-3213
CAS Number	160970-54-7^N
PubChem (CID)	5312125
IUPHAR/BPS	493
ChemSpider	4471557^Y
UNII	CUZ39LUY82^Y
ChEMBL	CHEMBL24778^Y
Chemical and physical data
Formula	C₂₅H₃₂F₃N₃O₄
Molar mass	495.534 g/mol
3D model (Jmol)	Interactive image
SMILES FC(F)(F)COc3ccccc3OCCN[C@H](C)Cc1cc2c(c(c1)C(=O)N)N(CC2)CCCO
InChI 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^Y Key:PNCPYILNMDWPEY-QGZVFWFLSA-N^Y
^NY (what is this?) (verify)

Silodosin (trade names Rapaflo (USA), Silodyx (Europe and South Africa), Rapilif (India), Silodal (India), Urief (Japan), Urorec (Russia)) is a medication for the symptomatic treatment of benign prostatic hyperplasia. It acts as an α₁-adrenoceptor antagonist with high uroselectivity (selectivity for the prostate).

History

Silodosin received its first marketing approval in Japan in May 2006 under the tradename Urief, which is jointly marketed by Kissei Pharmaceutical Co., Ltd. and Daiichi Sankyo Pharmaceutical Co., Ltd.

Kissei licensed the US, Canadian, and Mexican rights for silodosin to Watson Pharmaceuticals, Inc. in 2004.

FDA approved silodosin on October 9, 2008.^[1] Silodosin is marketed under the trade names Rapaflo in the US and Silodyx in Europe.^[2] and Rapilif in India (Ipca Urosciences)

Pharmacology

Since silodosin has high affinity for the α_1A adrenergic receptor, it causes practically no orthostatic hypotension (in contrast to other α₁ blockers). On the other side, the high selectivity seems to be the cause of silodosin's typical side effect of loss of seminal emission.^[3]

As α_1A adrenoceptor antagonists are being investigated as a means to male birth control due to their ability to inhibit ejaculation but not orgasm, a trial with 15 male volunteers was conducted. While silodosin was completely efficacious in preventing the release of semen in all subjects, 12 out of the 15 patients reported mild discomfort upon orgasm. The men also reported the psychosexual side effect of being strongly dissatisfied by their lack of ejaculation.^[4]

References

↑ "Drugs.com, Watson Announces Silodosin NDA Accepted for Filing by FDA for the Treatment of Benign Prostatic Hyperplasia". Retrieved 2008-02-13.
↑ European Medicines Agency: Assessment report for Silodyx
↑ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2834370/
↑ Kobayashi K, Masumori N, Kato R, Hisasue S, Furuya R, Tsukamoto T (December 2009). "Orgasm is preserved regardless of ejaculatory dysfunction with selective alpha1A-blocker administration.". Int J Impot Res. 21 (5): 306–10. doi:10.1038/ijir.2009.27. PMC 2834370. PMID 19536124.

External links

Official site

Adrenergic receptor modulators

α₁

Agonists 6-FNE Amidephrine Anisodine Buspirone Cirazoline Corbadrine Dexisometheptene Dipivefrine Dopamine Droxidopa (L-DOPS) Ephedrine Epinephrine Etilefrine Etilevodopa Ethylnorepinephrine Indanidine Isometheptene L-DOPA (levodopa) L-Phenylalanine L-Tyrosine Melevodopa Metaraminol Methoxamine Methyldopa Midodrine Naphazoline Norepinephrine Octopamine (drug) Oxymetazoline Phenylephrine Phenylpropanolamine Pseudoephedrine Synephrine Tetryzoline Tiamenidine XP21279 Xylometazoline

Antagonists Abanoquil Adimolol Ajmalicine Alfuzosin Amosulalol Anisodamine Arotinolol Atiprosin Atypical antipsychotics (e.g., clozapine, olanzapine, quetiapine, risperidone) Benoxathian Buflomedil Bunazosin Carvedilol Corynanthine Dapiprazole Domesticine Doxazosin Ergolines (e.g., ergotamine, dihydroergotamine, lisuride, terguride) Etoperidone Eugenodilol Fenspiride Hydroxyzine Indoramin Ketanserin L-765,314 Labetalol mCPP Mepiprazole Metazosin Monatepil Moxisylyte Naftopidil Nantenine Nefazodone Neldazosin Niaprazine Nicergoline Niguldipine Pardoprunox Pelanserin Phendioxan Phenoxybenzamine Phentolamine Piperoxan Prazosin Quinazosin Ritanserin Silodosin Spiperone Talipexole Tamsulosin Terazosin Tiodazosin Tolazoline Trazodone Tetracyclic antidepressants (e.g., amoxapine, maprotiline, mianserin) Tricyclic antidepressants (e.g., amitriptyline, clomipramine, doxepin, imipramine, trimipramine) Trimazosin Typical antipsychotics (e.g., chlorpromazine, fluphenazine, loxapine, thioridazine) Urapidil WB-4101 Zolertine

α₂

Agonists (R)-3-Nitrobiphenyline 4-NEMD 6-FNE Amitraz Apraclonidine Brimonidine Cannabivarin Clonidine Corbadrine Detomidine Dexmedetomidine Dihydroergotamine Dipivefrine Dopamine Droxidopa (L-DOPS) Etilevodopa Ephedrine Ergotamine Epinephrine Etilefrine Ethylnorepinephrine Guanabenz Guanfacine Guanoxabenz L-DOPA (levodopa) L-Phenylalanine L-Tyrosine Lofexidine Medetomidine Melevodopa Methyldopa Mivazerol Naphazoline Norepinephrine Oxymetazoline Phenylpropanolamine Piperoxan Pseudoephedrine Rilmenidine Romifidine Talipexole Tetrahydrozoline Tiamenidine Tizanidine Tolonidine Urapidil XP21279 Xylazine Xylometazoline

Antagonists 1-PP Adimolol Aptazapine Atipamezole Atypical antipsychotics (e.g., asenapine, clozapine, lurasidone, paliperidone, quetiapine, risperidone, zotepine) Azapirones (e.g., buspirone, tandospirone) BRL-44408 Buflomedil Cirazoline Efaroxan Esmirtazapine Fenmetozole Fluparoxan Idazoxan mCPP Mianserin Mirtazapine NAN-190 Olanzapine Pardoprunox Phentolamine Phenoxybenzamine Piperoxan Piribedil Rauwolscine Rotigotine SB-269970 Setiptiline Spiroxatrine Sunepitron Tolazoline Typical antipsychotics (e.g., chlorpromazine, fluphenazine, loxapine, thioridazine) Yohimbine

Agonists Abediterol Alifedrine Amibegron Arbutamine Arformoterol Arotinolol BAAM Bambuterol Befunolol Bitolterol Broxaterol Buphenine Carbuterol Carmoterol Cimaterol Clenbuterol Corbadrine Denopamine Dipivefrine Dobutamine Dopamine Dopexamine Droxidopa (L-DOPS) Ephedrine Epinephrine Etafedrine Etilefrine Etilevodopa Ethylnorepinephrine Fenoterol Formoterol Hexoprenaline Higenamine Indacaterol Isoetarine Isoprenaline Isoxsuprine L-DOPA (levodopa) L-Phenylalanine L-Tyrosine Levosalbutamol Mabuterol Melevodopa Methoxyphenamine Methyldopa Mirabegron Norepinephrine Orciprenaline Oxyfedrine PF-610355 Phenylpropanolamine Pirbuterol Prenalterol Ractopamine Procaterol Pseudoephedrine Reproterol Rimiterol Ritodrine Salbutamol Salmeterol Solabegron Terbutaline Tretoquinol Tulobuterol Vilanterol Xamoterol XP21279 Zilpaterol Zinterol

Antagonists Acebutolol Adaprolol Adimolol Afurolol Alprenolol Alprenoxime Amosulalol Ancarolol Arnolol Arotinolol Atenolol Befunolol Betaxolol Bevantolol Bisoprolol Bopindolol Bornaprolol Brefonalol Bucindolol Bucumolol Bufetolol Bufuralol Bunitrolol Bunolol Bupranolol Butaxamine Butidrine Butofilolol Capsinolol Carazolol Carpindolol Carteolol Carvedilol Celiprolol Cetamolol Cicloprolol Cinamolol Cloranolol Cyanopindolol Dalbraminol Dexpropranolol Diacetolol Dichloroisoprenaline Dihydroalprenolol Dilevalol Diprafenone Draquinolol Ecastolol Epanolol Ericolol Ersentilide Esatenolol Esprolol Eugenodilol Exaprolol Falintolol Flestolol Flusoxolol Hydroxycarteolol Hydroxytertatolol ICI-118,551 Idropranolol Indenolol Indopanolol Iodocyanopindolol Iprocrolol Isoxaprolol Isamoltane Labetalol Landiolol Levobetaxolol Levobunolol Levomoprolol Medroxalol Mepindolol Metipranolol Metoprolol Moprolol Nadolol Nadoxolol Nebivolol Nifenalol Nipradilol Oxprenolol Pacrinolol Pafenolol Pamatolol Pargolol Penbutolol Pindolol Practolol Primidolol Procinolol Pronethalol Propafenone Propranolol Ridazolol Ronactolol Soquinolol Sotalol Spirendolol SR 59230A Sulfinalol Talinolol Tazolol Tertatolol Tienoxolol Tilisolol Timolol Tiprenolol Tolamolol Toliprolol Xibenolol Xipranolol

See also: Dopaminergics

Melatonergics

Serotonergics

Monoamine reuptake and release modulators

Monoamine metabolism modulators

Monoamine neurotoxins

Drugs used in benign prostatic hyperplasia (G04C)

5α-Reductase inhibitors	Dutasteride Epristeride Finasteride

Alpha blockers (α₁)	Alfuzosin Doxazosin Silodosin Tamsulosin Terazosin

Herbals	Pygeum africanum Saw palmetto extract

Other	Mepartricin Osaterone acetate Oxendolone

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