Ramelteon

drugbox
IUPAC_name = ("S")-"N"- [2-(1,6,7,8-tetrahydro-2"H"-indeno- [5,4-"b"]
furan-8-yl)ethyl] propionamide

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width1 = 150px

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width2 = 150px
CAS_number = 196597-26-9
ATC_prefix = N05
ATC_suffix = CH02
PubChem = 208902
DrugBank = APRD01213
C = 16 | H = 21 | N = 1 | O = 2
molecular_weight = 259.343 g/mol
bioavailability = 1.8%
protein_bound = ~82%
metabolism = Hepatic (CYP1A2-mediated)
elimination_half-life = 1-2.6 hours
excretion = Renal (84%) and fecal (4%)
pregnancy_AU =
pregnancy_US = C
legal_AU =
legal_UK =
legal_US = Rx-only
routes_of_administration = Oral

Ramelteon, marketed as Rozerem by Takeda Pharmaceuticals North America, is the first in a new class of sleep agents that selectively binds to the MT₁ and MT₂ receptors in the suprachiasmatic nucleus (SCN), versus binding to GABA _A receptors, such as with drugs like zolpidem, eszopiclone, and zaleplon. Ramelteon is approved by the FDA for long-term use.

Ramelteon does not show any appreciable binding to GABA_A receptors, which are associated with anxiolytic, myorelaxant, and amnesic effects.

Uses

Ramelteon is used for insomnia, particularly delayed sleep onset. Ramelteon has not been shown to produce dependence and has shown no potential for abuse, and the withdrawal and rebound insomnia that is typical with other GABA modulators is not present in ramelteon. It is currently the only non-scheduled prescription drug for the treatment of insomnia available in the United States. [http://www.rozerem.com/index.aspx] Some clinicians also use ramelteon for the treatment of Delayed sleep phase disorder.

Mechanism of action

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, as these receptors, acted upon by endogenous melatonin, are thought to be involved in the maintenance of the circadian rhythm underlying the normal sleep-wake cycle. Ramelteon has no appreciable affinity for the GABA receptor complex or for receptors that bind neuropeptides, cytokines, serotonin, dopamine, noradrenaline, acetylcholine, and opiates. Ramelteon also does not interfere with the activity of a number of selected enzymes in a standard panel.

The significance of ramelteon's lack of affinity for the MT₃ receptor is not clear, despite the manufacturer's emphasis of this fact in commercial advertisements. The MT₃ receptor appears almost exclusively in the gut and might not have any relationship to sleep or wakefulness.

The major metabolite of ramelteon, M-II, is active and has approximately one tenth and one fifth the binding affinity of the parent molecule for the human MT₁ and MT₂ receptors, respectively, and is 17 – 25-fold less potent than ramelteon in in vitro functional assays. Although the potency of M-II at MT₁ and MT₂ receptors is lower than the parent drug, M-II circulates at higher concentrations than the parent producing 20 – 100 fold greater mean systemic exposure when compared to ramelteon. M-II has weak affinity for the serotonin 5-HT2B receptor, but no appreciable affinity for other receptors or enzymes. Similar to ramelteon, M-II does not interfere with the activity of a number of endogenous enzymes.

All other known metabolites of ramelteon are inactive.

No published studies have indicated whether ramelteon is more or less safe or effective than melatonin, a much less expensive drug, widely available in the United States without a prescription. The biological action of melatonin is similar to that of ramelteon. The purported advantage of ramelteon is that the product and dosage is more likely to be pure and standardized, because it is a prescription drug that is monitored by the Food and Drug Administration (FDA).

Clinical Efficacy

In several randomized, double-blind, placebo-controlled outpatient trials, ramelteon did reduce the time to sleep by approximately 10 minutes. Though statistically relevant, the overall effect on sleep latency has no clinical relevance.

Adverse effects

Ramelteon caused hyperprolactinaemia 2-3x more often than placebo in clnical trials. Studies of rats and mice showed a dose-dependent increase in cancer. The long-term safety in man is unknown. Ramelteon was teratogenic in rats.

Drug interactions

Ramelteon has been studied in combination with omeprazole, theophylline, dextromethorphan, and midazolam, although one would probably not come across this medicine due to its high clearance and shorter half-life than other benzodiazepines. Thus, Intensive Care Units must assess the patient and carefully administer as needed. It is also used as a sedative before operations. Its half-life is less or greater than one hour. It is usually used in an Intensive Care Unit and administered via IV due to the destructive nature of first pass metabolism.) Other such drug-drug interactions include digoxin and warfarin. There were no clinically meaningful effects when ramelteon was coadministered with any of these drugs.

A drug interaction study showed that there were no clinically meaningful effects or an increase in adverse events when ramelteon and the SSRI Prozac (fluoxetine) were coadministered. Ramelteon and fluvoxamine should not be coadministered.

Ramelteon should be administered with caution in patients taking other CYP1A2 inhibitors, strong CYP3A4 inhibitors such as ketoconazole, and strong CYP2C9 inhibitors such as fluconazole.

Efficacy may be reduced when ramelteon is used in combination with potent CYP enzyme inducers such as rifampin, since ramelteon concentrations may be decreased.

Advertising campaign

Rozerem has become known for the surreal humor of its television advertisements, particularly one involving an insomniac chatting with Abraham Lincoln and a talking beaver over a chess board, while a hard-hat diver stands silently in the background. As of October, 2007, the most recent spot was framed as a late-night talk show, with the beaver as host, Lincoln as sidekick, a Rozerem expert as guest, and the diver as bandleader.

References

ources and external links

* [http://rozerem.com Rozerem Official Website]
* [http://general.takedapharm.com/content/file/pi.pdf?applicationcode=2bcc07ca-d9c0-4704-9a28-963127115641&filetypecode=rozerempi Prescribing Information Data Sheet]
* [http://www.rxlist.com/cgi/generic4/rozerem.htm RxList.com]
* [http://www.medscape.com/viewarticle/555428 Clinical Pharmacokinetic Monitoring of Midazolam in Critically Ill Patients in relation to midazolam as a drug-drug interaction to Rozerem]