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

Details

Stereochemistry ABSOLUTE
Molecular Formula C16H21NO2
Molecular Weight 259.3434
Optical Activity ( - )
Defined Stereocenters 1 / 1
E/Z Centers 0
Charge 0

SHOW SMILES / InChI
Structure of RAMELTEON

SMILES

CCC(=O)NCC[C@@H]1CCC2=C1C3=C(OCC3)C=C2

InChI

InChIKey=YLXDSYKOBKBWJQ-LBPRGKRZSA-N
InChI=1S/C16H21NO2/c1-2-15(18)17-9-7-12-4-3-11-5-6-14-13(16(11)12)8-10-19-14/h5-6,12H,2-4,7-10H2,1H3,(H,17,18)/t12-/m0/s1

HIDE SMILES / InChI

Description
Curator's Comment: description was created based on several sources, including https://www.takeda.com/news/2011/20111007_3902.html

Ramelteon was approved by the United States (U.S.) in July 2005, and the Japanese Ministry of Health, Labour and Welfare in April 2010. It is currently available in the USA and Japan as ROZEREM and is indicated for the treatment of insomnia characterized by difficulty with sleep onset. In October 7, 2011, Takeda has decided to discontinue the development of ramelteon in Europe for the treatment of insomnia in order to best optimize Takeda’s resources for its research and development activities. Ramelteon is a melatonin receptor agonist with both high affinity for melatonin MT1 and MT2 receptors and selectivity over the MT3 receptor. Ramelteon demonstrates full agonist activity in vitro in cells expressing human MT1 or MT2 receptors, and high selectivity for human MT1 and MT2 receptors compared to the MT3 receptor. The activity of ramelteon at the MT1 and MT2 receptors is believed to contribute to its sleep-promoting properties since these receptors are acted upon by endogenous melatonin and are thought to be involved in the maintenance of the circadian rhythm underlying normal sleep-wake cycles. Ramelteon has no appreciable affinity for the GABA receptor complex or for receptors that bind neuropeptides, cytokines, serotonin, dopamine, noradrenaline, acetylcholine, and opiates.

Originator

Approval Year

Targets

Targets

Primary TargetPharmacologyConditionPotency
Conditions

Conditions

ConditionModalityTargetsHighest PhaseProduct
Primary
ROZEREM

Approved Use

ROZEREM is indicated for the treatment of insomnia characterized by difficulty with sleep onset. The clinical trials performed in support of efficacy were up to 6 months in duration. The final formal assessments of sleep latency were performed after 2 days of treatment during the crossover study (elderly only), at 5 weeks in the 6-week studies (adults and elderly), and at the end of the 6-month study (adults and elderly) [see Clinical Studies (14)

Launch Date

2005
Cmax

Cmax

ValueDoseCo-administeredAnalytePopulation
25.9 ng/mL
64 mg single, oral
dose: 64 mg
route of administration: Oral
experiment type: SINGLE
co-administered:
RAMELTEON serum
Homo sapiens
population: HEALTHY
age: ADULT
sex: FEMALE / MALE
food status: FASTED
AUC

AUC

ValueDoseCo-administeredAnalytePopulation
36.1 ng × h/mL
64 mg single, oral
dose: 64 mg
route of administration: Oral
experiment type: SINGLE
co-administered:
RAMELTEON serum
Homo sapiens
population: HEALTHY
age: ADULT
sex: FEMALE / MALE
food status: FASTED
T1/2

T1/2

ValueDoseCo-administeredAnalytePopulation
1.9 h
64 mg single, oral
dose: 64 mg
route of administration: Oral
experiment type: SINGLE
co-administered:
RAMELTEON serum
Homo sapiens
population: HEALTHY
age: ADULT
sex: FEMALE / MALE
food status: FASTED
Funbound

Funbound

ValueDoseCo-administeredAnalytePopulation
30%
64 mg single, oral
dose: 64 mg
route of administration: Oral
experiment type: SINGLE
co-administered:
RAMELTEON serum
Homo sapiens
population: HEALTHY
age: ADULT
sex: FEMALE / MALE
food status: FASTED
Doses

Doses

DosePopulationAdverse events​
32 mg 1 times / day multiple, oral
Highest studied dose
Dose: 32 mg, 1 times / day
Route: oral
Route: multiple
Dose: 32 mg, 1 times / day
Sources:
unhealthy, 42.8 years
Health Status: unhealthy
Age Group: 42.8 years
Sex: M+F
Sources:
Other AEs: Somnolence, Malaise...
Other AEs:
Somnolence (12.7%)
Malaise (1.6%)
Dizziness (3.2%)
Nasopharyngitis (4.8%)
Sources:
40 mg 1 times / day multiple, oral
Overdose
Dose: 40 mg, 1 times / day
Route: oral
Route: multiple
Dose: 40 mg, 1 times / day
Sources:
unhealthy, 47 years
Health Status: unhealthy
Age Group: 47 years
Sex: F
Sources:
8 mg 1 times / day steady, oral
Recommended
Dose: 8 mg, 1 times / day
Route: oral
Route: steady
Dose: 8 mg, 1 times / day
Sources:
unhealthy, adult
Health Status: unhealthy
Age Group: adult
Sources:
Disc. AE: Somnolence, Dizziness...
AEs leading to
discontinuation/dose reduction:
Somnolence (0.8%)
Dizziness (0.5%)
Nausea (0.3%)
Fatigue (0.3%)
Headache (0.3%)
Insomnia (0.3%)
Sources:
160 mg single, oral
Highest studied dose
Dose: 160 mg
Route: oral
Route: single
Dose: 160 mg
Sources:
unknown
AEs

AEs

AESignificanceDosePopulation
Malaise 1.6%
32 mg 1 times / day multiple, oral
Highest studied dose
Dose: 32 mg, 1 times / day
Route: oral
Route: multiple
Dose: 32 mg, 1 times / day
Sources:
unhealthy, 42.8 years
Health Status: unhealthy
Age Group: 42.8 years
Sex: M+F
Sources:
Somnolence 12.7%
32 mg 1 times / day multiple, oral
Highest studied dose
Dose: 32 mg, 1 times / day
Route: oral
Route: multiple
Dose: 32 mg, 1 times / day
Sources:
unhealthy, 42.8 years
Health Status: unhealthy
Age Group: 42.8 years
Sex: M+F
Sources:
Dizziness 3.2%
32 mg 1 times / day multiple, oral
Highest studied dose
Dose: 32 mg, 1 times / day
Route: oral
Route: multiple
Dose: 32 mg, 1 times / day
Sources:
unhealthy, 42.8 years
Health Status: unhealthy
Age Group: 42.8 years
Sex: M+F
Sources:
Nasopharyngitis 4.8%
32 mg 1 times / day multiple, oral
Highest studied dose
Dose: 32 mg, 1 times / day
Route: oral
Route: multiple
Dose: 32 mg, 1 times / day
Sources:
unhealthy, 42.8 years
Health Status: unhealthy
Age Group: 42.8 years
Sex: M+F
Sources:
Fatigue 0.3%
Disc. AE
8 mg 1 times / day steady, oral
Recommended
Dose: 8 mg, 1 times / day
Route: oral
Route: steady
Dose: 8 mg, 1 times / day
Sources:
unhealthy, adult
Health Status: unhealthy
Age Group: adult
Sources:
Headache 0.3%
Disc. AE
8 mg 1 times / day steady, oral
Recommended
Dose: 8 mg, 1 times / day
Route: oral
Route: steady
Dose: 8 mg, 1 times / day
Sources:
unhealthy, adult
Health Status: unhealthy
Age Group: adult
Sources:
Insomnia 0.3%
Disc. AE
8 mg 1 times / day steady, oral
Recommended
Dose: 8 mg, 1 times / day
Route: oral
Route: steady
Dose: 8 mg, 1 times / day
Sources:
unhealthy, adult
Health Status: unhealthy
Age Group: adult
Sources:
Nausea 0.3%
Disc. AE
8 mg 1 times / day steady, oral
Recommended
Dose: 8 mg, 1 times / day
Route: oral
Route: steady
Dose: 8 mg, 1 times / day
Sources:
unhealthy, adult
Health Status: unhealthy
Age Group: adult
Sources:
Dizziness 0.5%
Disc. AE
8 mg 1 times / day steady, oral
Recommended
Dose: 8 mg, 1 times / day
Route: oral
Route: steady
Dose: 8 mg, 1 times / day
Sources:
unhealthy, adult
Health Status: unhealthy
Age Group: adult
Sources:
Somnolence 0.8%
Disc. AE
8 mg 1 times / day steady, oral
Recommended
Dose: 8 mg, 1 times / day
Route: oral
Route: steady
Dose: 8 mg, 1 times / day
Sources:
unhealthy, adult
Health Status: unhealthy
Age Group: adult
Sources:
Overview

OverviewOther

Other InhibitorOther SubstrateOther Inducer







Drug as perpetrator​

Drug as perpetrator​

TargetModalityActivityMetaboliteClinical evidence
no
no
no
no
no
no
no (co-administration study)
Comment: theophylline AUC increased 40% and Cmax increased 35%
Page: 11, 13
no
no (co-administration study)
Comment: dextromethorphan AUC and Cmax did not change
Page: 11, 13
no
no (co-administration study)
Comment: ramelteon decreased digoxin exposure by 3%
Page: 11, 60, 63
Drug as victim

Drug as victim

TargetModalityActivityMetaboliteClinical evidence
inconclusive
major
yes (co-administration study)
Comment: fluvoxamine increased ramelteon AUC 190-fold and Cmax 70-fold; rifampin decreased total expsoure to ramelteon by 80%
Page: 11, 13
minor
yes (co-administration study)
Comment: rifampin decreased total expsoure to ramelteon by 80%
Page: 11, 13
minor
yes (co-administration study)
Comment: ketaconazole increased ramelteon AUC by 84% and Cmax 36%; rifampin decreased total expsoure to ramelteon by 80%
Page: 11, 13
yes
yes (co-administration study)
Comment: fluconazole increased AUC by 150% and Cmax by 150%; rifampin decreased total expsoure to ramelteon by 80%
Page: 13.0
Tox targets

Tox targets

Sourcing

Sourcing

Vendor/AggregatorIDURL
PubMed

PubMed

TitleDatePubMed
The effects of ramelteon on respiration during sleep in subjects with moderate to severe chronic obstructive pulmonary disease.
2009-03
The effects of ramelteon in a first-night model of transient insomnia.
2009-01
The effect of melatonergic and non-melatonergic antidepressants on sleep: weighing the alternatives.
2009
Circadian phase-shifting effects of repeated ramelteon administration in healthy adults.
2008-10-15
Melatonin and its agonists: an update.
2008-10
Selective activation of melatonin receptors with ramelteon improves liver function and hepatic perfusion after hemorrhagic shock in rat.
2008-10
Melatonin receptor agonist ramelteon activates the extracellular signal-regulated kinase 1/2 in mouse cerebellar granule cells.
2008-09-09
Possibility that certain hypnotics might cause cancer in skin.
2008-09
Hypnotics and skin cancer: hint at drug carcinogenesis, coincidence, or benefit of more sleep?
2008-09
Sleep dysfunction in heart failure.
2008-09
Ramelteon: a novel approach in the treatment of insomnia.
2008-09
Acute sleep-promoting action of the melatonin agonist, ramelteon, in the rat.
2008-09
Efficacy and clinical safety of ramelteon: an evidence-based review.
2008-08
Effect of ramelteon, a selective MT(1)/MT (2)-receptor agonist, on respiration during sleep in mild to moderate COPD.
2008-08
Stimulatory effects of a melatonin receptor agonist, ramelteon, on BDNF in mouse cerebellar granule cells.
2008-07-04
Ramelteon 8 mg/d versus placebo in patients with chronic insomnia: post hoc analysis of a 5-week trial using 50% or greater reduction in latency to persistent sleep as a measure of treatment effect.
2008-07
Ramelteon: a melatonin receptor agonist for the treatment of insomnia.
2008-02-26
[New hypnotics: perspectives from sleep physiology].
2008-02-13
A review of ramelteon in the treatment of sleep disorders.
2008-02
Pharmacotherapy for insomnia.
2008-02
[Drugs for insomnia and improving quality of life (QOL): research and development of ramelteon, an MT1/MT2-receptor agonist].
2008-01
Ramelteon: a review of its use in insomnia.
2008
Melatonin receptor agonists: SAR and applications to the treatment of sleep-wake disorders.
2008
Melatonin therapy to improve nocturnal sleep in critically ill patients: encouraging results from a small randomised controlled trial.
2008
Melatonergic drugs in clinical practice.
2008
In search of novel and therapeutically significant melatoninergic ligands.
2007-11
Gateways to clinical trials.
2007-10
Design and synthesis of new N1 and C3-substituted 4-fluoroindolic melatoninergics.
2007-10
Self-reported efficacy and tolerability of ramelteon 8 mg in older adults experiencing severe sleep-onset difficulty.
2007-09
Safety of ramelteon in individuals with mild to moderate obstructive sleep apnea.
2007-09
Greater incidence of depression with hypnotic use than with placebo.
2007-08-21
Treatment options for insomnia.
2007-08-15
Evaluation of the efficacy and safety of ramelteon in subjects with chronic insomnia.
2007-08-15
Putting "sleepdriving" and new safety warning in perspective.
2007-08
New perspectives for the treatment of disorders of sleep and arousal.
2007-07
Jet lag: therapeutic use of melatonin and possible application of melatonin analogs.
2007-06-19
Hypnotic sedative drugs.
2007-06
The management of insomnia in the older adult.
2007-06
Will insomnia treatments produce overall cost savings to commercial managed-care plans? A predictive analysis in the United States.
2007-06
A 2-night, 3-period, crossover study of ramelteon's efficacy and safety in older adults with chronic insomnia.
2007-05
Putting insomnia to rest.
2007-04
Drug Insight: the use of melatonergic agonists for the treatment of insomnia-focus on ramelteon.
2007-04
Age and gender effects on the pharmacokinetics and pharmacodynamics of ramelteon, a hypnotic agent acting via melatonin receptors MT1 and MT2.
2007-04
[Recent and potential drugs for treatment of insomnia].
2007-01
Therapeutic options for sleep-maintenance and sleep-onset insomnia.
2007-01
Eszopiclone for late-life insomnia.
2007
Role of the melatonin system in the control of sleep: therapeutic implications.
2007
Update on the safety considerations in the management of insomnia with hypnotics: incorporating modified-release formulations into primary care.
2007
[Melatonin, melatonin receptor agonists and tryptophan as sleep aids].
2007
Use of non-benzodiazepine hypnotics in the elderly: are all agents the same?
2007
Patents

Sample Use Guides

The recommended dose 8 mg taken within 30 minutes of going to bed. It is recommended that drug not be taken with or immediately after a high fat meal.
Route of Administration: Oral
In Vitro Use Guide
Curator's Comment: Ramelteon inhibited forskolin-stimulated cAMP production in the CHO cells that express the human MT1 or MT2 receptors.
Unknown
Name Type Language
ROZEREM
Preferred Name English
RAMELTEON
HSDB   INN   JAN   MART.   MI   ORANGE BOOK   USAN   VANDF   WHO-DD  
INN   USAN  
Official Name English
RAMELTEON [JAN]
Common Name English
RAMELTEON [VANDF]
Common Name English
TAK375
Code English
(-)-N-(2-(((8S)-1,6,7,8-TETRAHYDRO-2H-INDENO(5,4-.BETA.)FURAN-8-YL)ETHYL)PROPANAMIDE
Common Name English
RAMELTEON [HSDB]
Common Name English
RAMELTEON [MART.]
Common Name English
RAMELTEON [ORANGE BOOK]
Common Name English
RAMELTEON [USAN]
Common Name English
TAK-375
Code English
Ramelteon [WHO-DD]
Common Name English
RAMELTEON [MI]
Common Name English
PROPANAMIDE, N-(2-((8S)-1,6,7,8-TETRAHYDRO-2H-INDENO(5,4-.BETA.)FURAN-8-YL)ETHYL)-
Common Name English
ramelteon [INN]
Common Name English
Classification Tree Code System Code
WHO-ATC N05CH02
Created by admin on Mon Mar 31 18:16:13 GMT 2025 , Edited by admin on Mon Mar 31 18:16:13 GMT 2025
LIVERTOX NBK548437
Created by admin on Mon Mar 31 18:16:13 GMT 2025 , Edited by admin on Mon Mar 31 18:16:13 GMT 2025
NDF-RT N0000000250
Created by admin on Mon Mar 31 18:16:13 GMT 2025 , Edited by admin on Mon Mar 31 18:16:13 GMT 2025
WHO-VATC QN05CH02
Created by admin on Mon Mar 31 18:16:13 GMT 2025 , Edited by admin on Mon Mar 31 18:16:13 GMT 2025
NDF-RT N0000175743
Created by admin on Mon Mar 31 18:16:13 GMT 2025 , Edited by admin on Mon Mar 31 18:16:13 GMT 2025
NCI_THESAURUS C47795
Created by admin on Mon Mar 31 18:16:13 GMT 2025 , Edited by admin on Mon Mar 31 18:16:13 GMT 2025
Code System Code Type Description
NCI_THESAURUS
C66504
Created by admin on Mon Mar 31 18:16:13 GMT 2025 , Edited by admin on Mon Mar 31 18:16:13 GMT 2025
PRIMARY
SMS_ID
100000085617
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PRIMARY
LACTMED
Ramelteon
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WIKIPEDIA
RAMELTEON
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PRIMARY
FDA UNII
901AS54I69
Created by admin on Mon Mar 31 18:16:13 GMT 2025 , Edited by admin on Mon Mar 31 18:16:13 GMT 2025
PRIMARY
CAS
196597-26-9
Created by admin on Mon Mar 31 18:16:13 GMT 2025 , Edited by admin on Mon Mar 31 18:16:13 GMT 2025
PRIMARY
USAN
PP-50
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PRIMARY
RXCUI
596205
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PRIMARY RxNorm
HSDB
7787
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PRIMARY
ChEMBL
CHEMBL1218
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PRIMARY
DRUG CENTRAL
2355
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PRIMARY
EVMPD
SUB21315
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PRIMARY
MERCK INDEX
m9489
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PRIMARY Merck Index
DAILYMED
901AS54I69
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PRIMARY
INN
8447
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PRIMARY
EPA CompTox
DTXSID6045951
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PRIMARY
MESH
C495910
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PRIMARY
PUBCHEM
208902
Created by admin on Mon Mar 31 18:16:13 GMT 2025 , Edited by admin on Mon Mar 31 18:16:13 GMT 2025
PRIMARY
IUPHAR
1356
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PRIMARY
DRUG BANK
DB00980
Created by admin on Mon Mar 31 18:16:13 GMT 2025 , Edited by admin on Mon Mar 31 18:16:13 GMT 2025
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