Clinical data
Trade names Melitor, Thymanax, Valdoxan
AHFS/ International Drug Names
License data
Routes of
ATC code N06AX22 (WHO)
Legal status
Legal status
  • AU: S4 (Prescription only)
  • UK: POM (Prescription only)
Pharmacokinetic data
Bioavailability 1%[1]
Protein binding 95%[1]
Metabolism hepatic (90% CYP1A2 and 10% CYP2C9)[1]
Biological half-life 1-2 hours[1]
Excretion Renal (80%, mostly as metabolites)[1]
CAS Number 138112-76-2 N
PubChem (CID) 82148
DrugBank DB06594 N
ChemSpider 74141 YesY
UNII 137R1N49AD YesY
KEGG D02578 YesY
Chemical and physical data
Formula C15H17NO2
Molar mass 243.301 g/mol
3D model (Jmol) Interactive image
 NYesY (what is this?)  (verify)

Agomelatine (BAN, rINN; trade names Valdoxan, Melitor, Thymanax) is a melatonergic antidepressant developed by the pharmaceutical company Servier. It is marketed for the treatment of major depressive disorder, primarily for its relatively favorable side effect profile: it avoids the weight gain, sexual dysfunction, and severe withdrawal associated with the most commonly used classes of antidepressants (SSRIs, SNRIs, tricyclics), while providing similar therapeutic benefit.[2][3][4]

Due to its distinctive mechanism of action, agomelatine is also studied for its effects on sleep regulation. Studies report various improvements in general quality of sleep metrics, as well as specific therapeutic benefits in circadian rhythm disorders.[4][5][6]


Agomelatine was discovered and developed by the European pharmaceutical company Servier Laboratories Ltd. Servier continued to develop the drug and conduct phase III trials in the European Union.

In March 2005, Servier submitted agomelatine to the European Medicines Agency (EMA) under the trade names Valdoxan and Thymanax.[7] On 27 July 2006, the Committee for Medical Products for Human Use (CHMP) of the EMA recommended a refusal of the marketing authorisation. The major concern was that efficacy had not been sufficiently shown, while there were no special concerns about side effects.[7] In September 2007, Servier submitted a new marketing application to the EMA.[8]

In March 2006, Servier announced it had sold the rights to market agomelatine in the United States to Novartis.[9] It was undergoing several phase III clinical trials in the US, and until October 2011 Novartis listed the drug as scheduled for submission to the FDA no earlier than 2012.[10] However, the development for the US market was discontinued in October 2011, when the results from the last of those trials became available.[11]

It received EMA approval for marketing in the European Union in February 2009[12] and TGA approval for marketing in Australia in August 2010.[1]

Medical uses

Major depressive disorder

Agomelatine is indicated for the treatment of major depressive episodes in adults.[12] Ten placebo controlled trials have been performed to investigate the short term efficacy of agomelatine in major depressive disorder. At the end of treatment, significant efficacy was demonstrated in six of the ten short-term double-blind placebo-controlled studies.[12] Two were considered "failed" trials, as comparators of established efficacy failed to differentiate from placebo. Efficacy was also observed in more severely depressed patients in all positive placebo-controlled studies.[12] The maintenance of antidepressant efficacy was demonstrated in a relapse prevention study.[12] A large meta-analysis of 20 trials with 7460 participants found agomelatine to be as effective as standard antidepressants.[13]

Results of the meta-analysis of three positive, randomized, double-blind, placebo controlled studies in 357 patients treated with agomelatine and 360 patients treated with placebo show that agomelatine is effective in treating severe depression. Its antidepressant effect is greater for more severe depression. In patients with a greater baseline score (>30 on HAMD17 scale), the agomelatine-placebo difference was of 4.53 points.[14] Controlled studies in humans have shown that agomelatine is at least as effective as the SSRI antidepressants paroxetine, sertraline, escitalopram, and fluoxetine in the treatment of major depression.[15][16][17]

A small open-label study has suggested efficacy in the treatment of atypical and melancholic depression.[18] Well-designed clinical trials have demonstrated efficacy in the treatment of anxious depression.[19][20] Agomelatine’s onset of action has been reported to occur as early as the first week of treatment.[21]

However, the body of research on agomelatine has been substantially affected by publication bias, prompting analyses which take into account both published and unpublished studies.[4][22][23] These have confirmed that agomelatine is (statistically) approximately as effective as more commonly used antidepressants (eg SSRIs), but some qualified this as "marginally clinically relevant",[23] being only slightly above placebo.[22][23]


Additionally, possibly because of its action on melatonin receptors, agomelatine appears to improve sleep quality, with no reported daytime drowsiness.[6] Agomelatine has demonstrated anxiolytic properties in rodents.[24] It has been found significantly more effective than placebo in the treatment of generalised anxiety disorder.[25] There is tentative evidence to suggest the efficacy of agomelatine as either a monotherapy or adjunct in the treatment of obsessive-compulsive disorder (OCD).[26][27][28][29] A case report documenting the efficacy of agomelatine in the treatment of social anxiety disorder has been published.[30] An open-label study has found agomelatine to be efficacious in the treatment of seasonal affective disorder.[31] Open-label studies have suggested efficacy of adjunctive agomelatine in bipolar depression.[32][33] A study in mice found that it protected against pentylenetetrazole- and pilocarpine-induced seizures.[34] A small placebo-controlled trial found some benefit of agomelatine in attention deficit hyperactivity disorder (ADHD).[35]

Use in special populations

It is not recommended for use in children and adolescents below 18 years of age due to a lack of data on safety and efficacy.[12] Only limited clinical data is available on the use of agomelatine in elderly patients ≥ 65 years old with major depressive episodes. Therefore, caution should be exercised when prescribing it to these patients.[12]

Adverse effects

Agomelatine does not alter daytime vigilance and memory in healthy volunteers. In depressed patients, treatment with the drug increased slow wave sleep without modification of REM (Rapid Eye Movement) sleep amount or REM latency. Agomelatine also induced an advance of the time of sleep onset and of minimum heart rate. From the first week of treatment, onset of sleep and the quality of sleep were significantly improved without daytime clumsiness as assessed by patients.[1][12]

Agomelatine appears to cause fewer sexual side effects and discontinuation effects than paroxetine.[1] It appears better tolerated than the SSRIs.[16]

Common (1-10% incidence) adverse effects include[1][12][36][37]
  • Hyperhidrosis (excess sweating that is not proportionate to the ambient temperature)
  • Abdominal pain
  • Nausea
  • Vomiting
  • Diarrhea
  • Constipation
  • Back pain
  • Fatigue
  • Increased ALAT and ASAT (liver enzymes)
  • Headache
  • Dizziness
  • Somnolence
  • Insomnia
  • Migraine
  • Anxiety
Uncommon (0.1-1%) adverse effects include[1][12][36][37]
Rare (0.01-0.1%) adverse effects include[1][12][36][37]

Note: mania and hypomania are often due to an underlying disease, namely bipolar disorder.


Agomelatine is contraindicated in patients with kidney or liver impairment.[12] According to information disclosed by Les Laboratoires Servier on October 10, 2012, guidelines for the follow-up of patients treated with Valdoxan have been modified in concert with the European Medicines Agency. As some patients may experience increased levels of liver enzymes in their blood during treatment with Valdoxan, doctors have to run laboratory tests to check that the liver is working properly at the initiation of the treatment and then periodically during treatment, and subsequently decided whether to pursue the treatment or not.[39] No relevant modification in agomelatine pharmacokinetic parameters in patients with severe renal impairment has been observed. However, only limited clinical data on its use in depressed patients with severe or moderate renal impairment with major depressive episodes is available. Therefore, caution should be exercised when prescribing agomelatine to these patients.[12]


Agomelatine is a substrate of CYP1A2, CYP2C9 and CYP2C19. Inhibitors of these enzymes, e.g. the SSRI antidepressant fluvoxamine, reduce its clearance and can therefore lead to an increase in agomelatine exposure.[1][36] There is also the potential for agomelatine to interact with alcohol to increase the risk of hepatotoxicity.[1][36]


Agomelatine is expected to be relatively safe in overdose.[40]

Dependence and withdrawal

No dosage tapering is needed on treatment discontinuation.[12] Agomelatine has no abuse potential as measured in healthy volunteer studies.[1][12]


Melatonin (top) vs. agomelatine (bottom)

The chemical structure of agomelatine is very similar to that of melatonin. Where melatonin has an NH group, agomelatine has an HC=CH group. Thus melatonin contains an indole part, whereas agomelatine has a naphthalene bioisostere instead.[41]

Mechanism of action

Agomelatine is a melatonin receptor agonist (MT1 (Ki=0.1nM) and MT2 (Ki=0.12nM)) and a 5-HT2C (Ki=631nM) receptor antagonist.[42] Binding studies indicate that it has no effect on monoamine uptake and no affinity for adrenergic, histaminergic, cholinergic, dopaminergic and benzodiazepine receptors, nor other serotonergic receptors.[12]

Agomelatine resynchronises circadian rhythms in animal models of delayed sleep phase syndrome.[5] By antagonizing 5-HT2C receptors, it disinhibits/increases noradrenaline and dopamine release specifically in the frontal cortex. Therefore, it is sometimes classified as a norepinephrine–dopamine disinhibitor. It has no influence on the extracellular levels of serotonin. Agomelatine has shown an antidepressant-like effect in animal models of depression (learned helplessness test, despair test, chronic mild stress) as well as in models with circadian rhythm desynchronisation and in models related to stress and anxiety. In humans, agomelatine has positive phase shifting properties; it induces a phase advance of sleep, body temperature decline and melatonin onset.[12]


Melatoninergic agonist and selective serotonin 5-HT2B and 5-HT2C receptor antagonist; metabolically stable analogue of melatonin, q.v.

Agomelatine-synthesis:;[43] and structure-activity studies:[44][45]

See also


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