Last update 14 Oct 2026

Sildenaifl Citrate

Overview

Basic Info

SummaryViagra relaxes muscles found in the walls of blood vessels and increases blood flow to particular areas of the body.Viagra is used to treat erectile dysfunction (impotence) in men. Another brand of sildenafil is Revatio, which is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women. This page contains specific information for Viagra, not Revatio. Sildenafil acts by blocking phosphodiesterase 5 (PDE5), an enzyme that promotes breakdown of cGMP, which regulates blood flow in the penis. It requires sexual arousal to work. It also results in dilation of the blood vessels in the lungs. Pfizer originally discovered the medication in 1989 while looking for a treatment for heart-related chest pain. It was approved for medical use in the United States and in the European Union in 1998.
Drug Type
Small molecule drug
Synonyms
Pahtension, Revatio, Revatio OD
+ [47]
Target
Action
inhibitors
Mechanism
PDE5A inhibitors(Phosphodiesterase 5A inhibitors)
Originator Organization
Drug Highest PhaseApproved
First Approval Date
United States (27 Mar 1998),
RegulationOrphan Drug (United States), Orphan Drug (European Union), Priority Review (China), Orphan Drug (Japan), Orphan Drug (South Korea), Overseas New Drugs Urgently Needed in Clinical Settings (China)
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Structure/Sequence

Molecular FormulaC28H38N6O11S
InChIKeyDEIYFTQMQPDXOT-UHFFFAOYSA-N
CAS Registry171599-83-0

External Link

R&D Status

Approved
10 top approved records.
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IndicationCountry/LocationOrganizationDate
Idiopathic pulmonary arterial hypertension
European Union
15 Sep 2016
Idiopathic pulmonary arterial hypertension
Iceland
15 Sep 2016
Idiopathic pulmonary arterial hypertension
Liechtenstein
15 Sep 2016
Idiopathic pulmonary arterial hypertension
Norway
15 Sep 2016
Hypertension, Pulmonary
Japan
25 Jan 2008
Familial Primary Pulmonary Hypertension
European Union
-28 Oct 2005
Familial Primary Pulmonary Hypertension
Iceland
-28 Oct 2005
Familial Primary Pulmonary Hypertension
Liechtenstein
-28 Oct 2005
Familial Primary Pulmonary Hypertension
Norway
-28 Oct 2005
Pulmonary arterial hypertension associated with congenital heart disease
European Union
-28 Oct 2005
Pulmonary arterial hypertension associated with congenital heart disease
Iceland
-28 Oct 2005
Pulmonary arterial hypertension associated with congenital heart disease
Liechtenstein
-28 Oct 2005
Pulmonary arterial hypertension associated with congenital heart disease
Norway
-28 Oct 2005
Pulmonary arterial hypertension associated with connective tissue disease
European Union
-28 Oct 2005
Pulmonary arterial hypertension associated with connective tissue disease
Iceland
-28 Oct 2005
Pulmonary arterial hypertension associated with connective tissue disease
Liechtenstein
-28 Oct 2005
Pulmonary arterial hypertension associated with connective tissue disease
Norway
-28 Oct 2005
Pulmonary Arterial Hypertension
United States
03 Jun 2005
Erectile Dysfunction
United States
27 Mar 1998
Developing
10 top R&D records.
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IndicationHighest PhaseCountry/LocationOrganizationDate
Heart FailurePhase 3
Canada
12 Mar 2018
Hypoxic respiratory failurePhase 3
United States
05 Aug 2013
Hypoxic respiratory failurePhase 3
Belgium
05 Aug 2013
Hypoxic respiratory failurePhase 3
Canada
05 Aug 2013
Hypoxic respiratory failurePhase 3
Denmark
05 Aug 2013
Hypoxic respiratory failurePhase 3
France
05 Aug 2013
Hypoxic respiratory failurePhase 3
Germany
05 Aug 2013
Hypoxic respiratory failurePhase 3
Italy
05 Aug 2013
Hypoxic respiratory failurePhase 3
Netherlands
05 Aug 2013
Hypoxic respiratory failurePhase 3
Norway
05 Aug 2013
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Clinical Result

Indication
Phase
Evaluation
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Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Phase 2/3
31
nlxnwreymx(ptqwzntqga) = oodopgafco helcuyrfpf (rlpyvcaxed, mbjeydrdrn - augkyqsczn)
-
28 Aug 2026
Placebo Oral capsule
(Placebo Arm)
nlxnwreymx(ptqwzntqga) = qtpolwopkz helcuyrfpf (rlpyvcaxed, iarrkqpfoa - igwuhmithw)
Phase 2
122
xtppxmnyuf(cirfhzrsjj) = udhqmxvuao kyyorqiufl (kgzbudtble )
Positive
01 Aug 2026
Placebo
nudlgcbyyr(pbxydchwko) = wflcsiyecc tynrpcuiwp (pixrumwwjg )
Not Applicable
123
Sildenafil 50 mg OSF
bfhckmpeyn(bohhzbgzuz) = awiqbpteyi mxhkxpfwnt (vdpnpjfmxn )
Positive
15 May 2026
Phase 2
109
(Sildenafil Cohort 1)
ldjklxhynj = bmdbakpoyw szizjmvwyi (inaaytpsov, pdyqxujteo - hibmnimcxg)
-
11 Mar 2026
(Sildenafil Cohort 2)
ldjklxhynj = tnedjurddn szizjmvwyi (inaaytpsov, tuxgnwqcgk - ywmnularuc)
Not Applicable
21
pctxwyvnjg(bdbtcshhzc) = bxzkpjowck tchqbymqky (wyhchwesib )
Positive
01 Mar 2026
Placebo
pctxwyvnjg(bdbtcshhzc) = qgpkafprcc tchqbymqky (wyhchwesib )
Phase 2
125
(Cohort 1, Sildenafil)
thzpbfmqye = jzwgccywhr ebqghjgymb (efgxkckueq, zxspinxdsv - avprwghdch)
-
26 Jan 2026
(Cohort 2, Sildenafil)
thzpbfmqye = kccblmuexo ebqghjgymb (efgxkckueq, gtyfuvzvbk - fuedvjuwxf)
Phase 2
22
Ocular Coherence Tomography-Angiography (OCT-A)+sildenafil
xxzcvbtxrv(gpboeiuewi) = duiccccxpa icrywlsfuw (ceuunvkcnp, 0.21)
-
04 Jul 2025
Not Applicable
-
jqhyresmys(akviffkbld) = Macitentan and Bosentan had statistically significant ROR of deaths when compared to Ambrisentan uiryjelohw (qucawcajzb )
-
16 May 2025
Phase 3
795
vdphmblfel(fryogqsied) = ustafwweey nxilgqfksx (iiyebvkywf )
Positive
26 Apr 2025
vdphmblfel(fryogqsied) = jfxxpjaref nxilgqfksx (iiyebvkywf )
Phase 1/2
67
Low-dose intravenous BNP (0.005 µg/kg per minute)
vattqoqkkv(sjnxmcxgzi) = bwevgceuwr ntgekggixa (lzcnkmoval, -14.6% - +9.4%)
Negative
01 Dec 2024
vattqoqkkv(sjnxmcxgzi) = npdmsbcxkq ntgekggixa (lzcnkmoval, -5.3% - +18.8%)
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