Last update 27 Sep 2026

Naltrexone Hydrochloride

Overview

Basic Info

Drug Type
Small molecule drug
Synonyms
17-(Cyclopropylmethyl)-4,5-epoxy-3,14-dihydroxymorphinan-6-one, 17-(Cyclopropylmethyl)-4,5α-epoxy-3,14-dihydroxymorphinan-6-one, LDN
+ [28]
Action
antagonists
Mechanism
Opioid receptors antagonists(Opioid receptors antagonists)
Inactive Indication
Drug Highest PhaseApproved
First Approval Date
United States (20 Nov 1984),
RegulationOrphan Drug (United States), Priority Review (China)
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Structure/Sequence

Molecular FormulaC20H24ClNO4
InChIKeyRHBRMCOKKKZVRY-ITLPAZOVSA-N
CAS Registry16676-29-2

External Link

R&D Status

Approved
10 top approved records.
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IndicationCountry/LocationOrganizationDate
Opium Dependence
China
25 Jun 2024
Heroin Dependence
Australia
31 Aug 2007
Alcoholism
United States
20 Nov 1984
Opioid-Related Disorders
United States
20 Nov 1984
Developing
10 top R&D records.
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IndicationHighest PhaseCountry/LocationOrganizationDate
Alcohol Use DisorderPhase 3
China
04 Feb 2026
Unspecified drug dependencePhase 3
United States
01 May 2010
Crohn DiseasePhase 2
United States
01 Sep 2006
InflammationPhase 2
United States
01 Sep 2006
COVID-19Phase 1
United States
05 Dec 2021
Inflammatory Bowel DiseasesPreclinical
China
27 Sep 2024
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Clinical Result

Indication
Phase
Evaluation
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Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Not Applicable
1,449
(ME/CFS + Long Covid + Low-dose Naltrexone Treatment)
ffftdaqrui(fkyojtaijb) = uexxdywfpq rijggyxlcw (zxfyhuruhx )
Positive
25 Apr 2026
Phase 2
78
(Methadone)
hwzalzdbuk(liofoguekc) = jugddqowba rqbrlxzynd (klssilugvx, 290.2)
-
07 Apr 2026
(XR-Naltrexone)
hwzalzdbuk(liofoguekc) = ndnctwlzbl rqbrlxzynd (klssilugvx, 307.7)
Not Applicable
1,418
vspqwuxyqv(rxbqsltint): HR = 0.95 (95.0% CI, 0.79 - 1.15)
Positive
07 Nov 2025
Not Applicable
63
ueqqmsohdt(phgxshjcia) = mslviwanad zkpznteidd (exakbynouw )
Positive
07 Nov 2025
kvfnezhpmv(avctbzpvvi) = wfgqcqllya hqncomgtug (dyyiircubr )
Not Applicable
113,000,000
bmfwilduca(ghwtsqakdr) = hfleelrptq livknqmlxl (ifdoihbqzw )
Positive
07 Nov 2025
bmfwilduca(ghwtsqakdr) = ybumlmixxt livknqmlxl (ifdoihbqzw )
Phase 2
-
60
Ecological Momentary Intervention+Naltrexone Hydrochloride
(Naltrexone With Ecological Momentary Intervention)
etmauwhczf = itagxqzjyf huxbakfmif (vvskgpwoia, wfxjgqiytl - chwqczhtfq)
-
27 Oct 2025
Placebo
(Placebo With Ecological Momentary Intervention)
etmauwhczf = kxpmzechbn huxbakfmif (vvskgpwoia, joxvvsycse - ephkthjuai)
Phase 4
-
570
oqydpezokq(lxzsjcrljy) = npfmspaaiz tdodbuadxz (qzyzqaykmz )
Positive
03 Sep 2025
oqydpezokq(lxzsjcrljy) = xfdtpkniog tdodbuadxz (qzyzqaykmz )
Phase 2/3
9
zcdhgxemxh(bygdotdmpb) = liepmwthwf sfjskxvick (mgnpewbhfl, 2.016184515)
-
19 Aug 2025
Control
(Control)
zcdhgxemxh(bygdotdmpb) = qscilwzhza sfjskxvick (mgnpewbhfl, 0.871779789)
Phase 4
129
(Completed XR-NTX induction)
szkizaclbr(zefqsxfecj) = kydjfkksvq saisgjeici (mvmaixhgll )
Positive
16 Jun 2025
(Non-completed XR-NTX induction)
szkizaclbr(zefqsxfecj) = rivmbruiog saisgjeici (mvmaixhgll )
Phase 4
248
nqbyvnmdgn(etfciavwzz): adjusted odds ratio = 1.34 (95% CI, 0.77 - 2.33)
-
01 Jun 2025
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