Moclobemide
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Clinical data | |
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Trade names | Amira, Aurorix, Clobemix, Depnil, Manerix, others |
AHFS/Drugs.com | Micromedex Detailed Consumer Information |
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Routes of administration | By mouth |
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Moclobemide, sold under the brand names Amira, Aurorix,
No significant rise in blood pressure occurs when moclobemide is combined with amines such as
Medical uses
Reversible selective MAOIs such as moclobemide are underprescribed due to the misconception that the side effect profiles are analogous to that of the irreversible and non-selective MAOIs.[15] MAOIs such as moclobemide are reported to have a relatively fast onset of action compared to other antidepressant drug classes,[16] and have good long-term tolerability in terms of side effects.[17]
Tolerance does not seem to occur; research has found that moclobemide retains its beneficial therapeutic properties in depression for at least a year.[18]
- tricyclic antidepressants.[22]
- neurotic depression all respond to moclobemide,[23] as does atypical depression.[24] Unipolar endogenous depression is reported to have the best response to moclobemide therapy.[25][26] Individuals suffering from depression who are given moclobemide are twice as likely to improve on moclobemide than on placebo.[27] A concern of antidepressant adverse effects is sexual dysfunction; however, moclobemide has been found to actually increase libido and improve impaired erection, ejaculation and orgasm.[28] Cardiovascular toxicity is a concern with antidepressants such as tricyclic antidepressants as well as the irreversible MAOIs; when cardiovascular toxicity is a concern, SSRIs or the reversible MAOIs such as moclobemide are an option as they lack or have a significantly reduced level of cardiovascular toxicity in terms of adverse effect as well as in overdose.[29]
- The effectiveness of moclobemide in agitated depression is equivalent to that of imipramine and sedative antidepressants such as amitriptyline, mianserin and maprotiline. The therapeutic response in agitated depressive individuals is similar to that seen in non-agitated depression; however, a past history of use of antidepressants reduces the chance of successful therapeutic response. The addition of a benzodiazepine to moclobemide therapy has not been found to be of benefit in this population group.[30] Moclobemide has better tolerability compared to TCAs.[31][32]
- Dysthymia – moclobemide has been found to be effective in the treatment and management of this depressive disorder.[33]
- alcohol use disorder, however.[37] The Australian Medicines Handbook lists social phobia as an accepted but not a licensed indication.[11] The use of moclobemide in the treatment of social anxiety disorder has given mixed results with a tendency of response at higher doses (>300 mg/d) compared with placebo.[38]
- major depression,[39] and moclobemide could therefore help increase abstinence rates due to moclobemide mimicking the MAO-A inhibiting effects of tobacco smoke. A 2023 Cochrane review[40] found only one 1995 trial[39]studying the effects of moclobemide on smoking cessation, it was administered for 3 months and then stopped; at 6 months follow-up it was found those who had taken moclobemide for 3 months had a much higher successful quit rate than those in the placebo group. However, at 12-month follow-up the difference between the placebo group and the moclobemide group was no longer significant.
- Panic disorder – moclobemide is useful in the treatment and management of panic disorder.[41] Panic disorder is mentioned as an accepted but unlicensed indication in the Australian Medicines Handbook.[11]
- ADHD – Two small studies assessing the benefit of moclobemide in people with attention deficit disorder found that moclobemide produced favourable results.[23]
- Fibromyalgia – moclobemide has been found to improve pain and functioning in this group of people.[42]
Similar to other MAOIs, reversible MAOIs such as moclobemide may also be effective in a range of other psychiatric disorders.
In efficacy studies for the treatment of major depressive disorder, moclobemide has been found to be significantly more effective than placebo, as effective as the tricyclic antidepressants (TCAs) and selective serotonin reuptake inhibitors (SSRIs), and somewhat less effective than the older, irreversible MAOIs
People on irreversible MAOIs have to discontinue these antidepressants two weeks before general anesthesia, however, the use of moclobemide, due to its reversible nature, would allow such patients to possibly continue antidepressant therapy.[46][47]
A
Pregnancy and lactation
The doses of moclobemide in breast milk are very low (0.06% of moclobemide being recovered in breast milk) and therefore it has been concluded that moclobemide is unlikely to have any adverse effect on a suckling baby.[9]
Children
Use in children is not recommended as there is insufficient data to assess safety and efficacy in these patients.[11][12]
Elderly
Reversible MAOIs such as moclobemide may have advantages in the treatment of depression associated with Alzheimer's disease due to its effect on noradrenaline.[49] Cognitive impairments have been found to improve in people with dementia when depression is treated with moclobemide.[23] Due to its superior safety profile, moclobemide has been recommended as a first line agent for the treatment of depression in the elderly.[50] Due to the side effect profile of moclobemide, it may be a better option for this sub group of people than other antidepressants.[51] Research has found evidence that moclobemide may be able to counter anti-cholinergic (Scopolamine) induced cognitive impairments thus making moclobemide a good choice in the depression in the elderly and those with dementia.[52]
Adverse effects
The incidence of adverse events is not correlated with age; however, adverse events occur more often in females than in males.[53] Moclobemide is regarded as a generally safe antidepressant and due to its favorable side effect profile, it can be considered a first-line therapeutic antidepressant.[54] The rate of incidence of side effects of moclobemide is low,[21] with insomnia, headache and dizziness being the most commonly reported side effects in the initial stages of therapy with moclobemide.[55] Moclobemide, even at high doses of 600 mg, does not impair the ability to drive a motor vehicle.[9][2] The tolerability of moclobemide is similar in women and men and it is also well tolerated in the elderly.[56] Moclobemide has been found to be superior to tricyclic and irreversible MAOI antidepressants in terms of side effects, as it does not cause anticholinergic, sedative or cardiovascular adverse effects.[10][2]
Unlike the irreversible MAOIs there is no evidence of liver toxicity with moclobemide.
Some of the side effects are transient and disappear within 2 weeks of treatment.
Moclobemide is relatively well tolerated. The following are the potential adverse effects and their respective incidences:[14][69]
- Common (>1% incidence) adverse effects
- Nausea
- Dry mouth
- Constipation
- Diarrhoea
- Insomnia
- Dizziness
- Anxiety
- Restlessness
- Uncommon/Rare (<1%) adverse effects
- Difficulties falling asleep
- Nightmares and vivid dreams
- Hallucinations
- Memory disturbances
- Confusion
- Disorientation
- Delusions
- Increased depression
- Excitation/irritability
- Hypomania
- Mania
- Aggressive behaviour
- Apathy
- Tension
- Suicidal ideation
- Suicidal behaviour
- Migraine
- Extrapyramidal effects
- Tinnitus
- Paraesthesia
- Dysarthria
- Heartburn
- Gastritis
- Tympany
- Indigestion
- Hypertension
- Bradycardia
- Extrasystoles
- Angina/chest pain
- Phlebetic symptoms
- Flushing
- Exanthema/rash
- Allergic skin reaction
- Itching
- Gingivitis
- Stomatitis
- Dry skin
- Conjunctivitis
- Pruritus
- Urticaria
- Disturbances of micturition (dysuria, polyuria, tenesmus)
- Metrorrhagia
- Prolonged menstruation
- General malaise
- Skeletal/muscular pain
- Altered taste sensations
- Hot flushes/cold sensation
- Photopsia
- Dyspnoea
- Visual disturbances
- Increased hepatic enzymes without associated clinical sequelae.
Contraindications
Avoid use in:[11]
- Confusional states
- Phaeochromocytoma
and caution is recommended in:[12]
- Agitated/excited patients
- Thyrotoxicosis
Interactions
- Drug
Moclobemide has fewer interactions than irreversible MAOIs. Cimetidine however, causes a significant rise in moclobemide levels and therefore if the combination is used, lower doses of moclobemide have been recommended.[70] There is little increase in the effects of alcohol when combined with moclobemide[70] and, in fact, moclobemide causes a reduction in alcohol-related impairments.[59] Moclobemide also interacts with pethidine/meperidine,[71] and dextropropoxyphene.[58] Ephedrine in combination with moclobemide increases the risk of cardiovascular adverse effects.[72] Moclobemide is also likely to interact with warfarin.[73] The combination of moclobemide with prescription or over the counter sympathomimetic drugs is not recommended due to the potential of significant drug interactions.[74]
- Dietary
Irreversible MAOIs can cause unpleasant and occasionally dangerous side effects such as a
While moclobemide or the irreversible MAO-B selective inhibitor selegiline taken alone has very little pressor effect, and requires no dietary restriction, the combination of selegiline with moclobemide leads to a significant enhancement of the pressor effect and such a combination requires dietary restriction of foods containing high amounts of tyramine.[88] The combination of moclobemide and a reversible MAO-B inhibitor requires tyramine dietary restrictions.[89]
Overdose
Moclobemide is considered to be less toxic in overdose compared to older antidepressants, such as the tricyclic antidepressants and the irreversible and non-selective MAOIs,[10] making it a safer antidepressant in the elderly or people with physical disorders.[2] Of 18 people who overdosed on moclobemide during clinical trials, all recovered fully and moclobemide was judged to be safe for inpatient as well as outpatient use.[90] Intoxications with moclobemide as single agent are usually mild; however, when combined with tricyclic or SSRI antidepressants the overdose is much more toxic and potentially fatal.[91][92] Moclobemide, is preferred by doctors for patients who are at risk of suicide, due to moclobemide's low toxicity in overdose.[93] Patients with mixed intoxications (e.g. with other CNS active drugs) may show severe or life-threatening symptoms and should be hospitalized. Treatment is largely symptomatic and should be aimed at maintenance of the vital functions.
Withdrawal and tolerance
Withdrawal symptoms appear to be very rare with moclobemide compared to other antidepressants[citation needed]; a single report of relatively mild flu-like symptoms persisting for 7 days after rapid reduction of high dose moclobemide therapy has been reported in one patient.[94] Withdrawal of moclobemide causes a rebound in REM sleep.[9]
Moclobemide does not seem to prevent withdrawal symptoms from
Discontinuation of moclobemide is recommended to be done gradually to minimise side effects (e.g. rapid return of condition being treated and/or the appearance of withdrawal symptoms). Tolerance to the therapeutic effects has been reported in a small number of users of MAOIs including moclobemide.[15]
Pharmacology
Moclobemide is a
It has been described as a 'slow binding inhibitor', whereby conformational changes to either moclobemide or the enzyme to MAO-A slowly form a more tightly bound complex, resulting in the non-competitive MAO inhibition by moclobemide.[9] With three times daily dosing the inhibition on MAO-A was relatively constant with moclobemide.[105] The MAO inhibition of moclobemide lasts about 8–10 hours and wears off completely by 24 hours after dosing.[9][97] The inhibition of MAO-A by moclobemide is 10 times more potent than the irreversible MAOI phenelzine and approximately equivalent to tranylcypromine and isocarboxazid.[9]
Moclobemide increases levels of extracellular
Moclobemide is chemically unrelated to irreversible MAOI antidepressants and only has a very weak pressor effect of orally administered tyramine.[109] In humans, the n-oxide metabolites of moclobemide and moclobemide itself are the compounds that produce most of the inhibition of MAO-A; other metabolites are significantly less potent than the parent compound.[9]
In healthy people moclobemide has a relatively small suppressing effect on
Moclobemide also has neuroprotective properties in its demonstrated anti-
Platelet MAO is of the MAO-B and this is inhibited only to a small degree in humans; the inhibition is due to low levels of metabolites of moclobemide that have MAO-B inhibiting properties.[112] Moclobemide has been reported to be a mixed MAO-A/MAO-B inhibitor in rats but in man, it has been reported to be a pure MAO-A inhibitor,[113] blocking the decomposition of norepinephrine, serotonin and, to a lesser extent, dopamine. No reuptake inhibition of any of the neurotransmitters occurs. The pharmacodynamic action encompasses activation, elevation of mood, and improvement of symptoms like dysphoria, fatigue, and difficulties in concentration. The duration and quality of sleep may be improved. In the treatment of depression the antidepressant effect often becomes evident in the first week of therapy (earlier than typically noted with TCAs/SSRIs).
MAO activity returns completely back to normal after 24 hours of the last dose, which allows for a quick switch to another antidepressant after the 24 hours.[9]
Pharmacokinetics
In humans moclobemide is rapidly and almost completely absorbed and totally metabolised via the liver.[114] Peak plasma levels occur 0.3 to 2 hours after oral administration. The bioavailability increases during the first week of therapy from 60% to 80% and more. The elimination half-life is around 2 hours.[9][115] It is moderately bound to plasma proteins, especially albumin.[9] However, the short disposition half life somewhat increases after repeated dosing; moclobemide has an intermediate elimination half life for systemic clearance and an intermediate volume of distribution.[114] Despite its short half-life the pharmacodynamic action of a single dose persists for approximately 16 hours. The drug is almost completely metabolized in the liver; it is a substrate of CYP2C19 and an inhibitor of CYP2C19, CYP2D6 and CYP1A2.[116] Less than 1 percent of the drug is excreted unchanged; 92 percent of the metabolised drug is excreted within the first 12 hours.[7] The main metabolites are the N-oxide Ro 12-5637 formed via morpholine N-oxidation and lactam derivative Ro 12-8095 formed via morpholine C-oxidation;[117][118] active metabolites are found only in trace amounts. The unchanged drug (less than 1%) as well as the metabolites are excreted renally (in urine). The main degradation pathway of moclobemide is oxidation.[119] About 44 percent of the drug is lost due to the first pass effect through the liver.[120] Age and renal function do not affect the pharmacokinetics of moclobemide. However, patients with significantly reduced liver function require dose reductions due to the significant slowing of metabolism of moclobemide.[121] Food slows the absorption but does not affect the bioavailability of moclobemide.[9]
Steady state concentrations are established after one week.
Animal toxicology
- Acute toxicity: The oral drowsiness.
- Chronic toxicity: In an 18-months-study in rats with 10 mg/kg no signs of chronic toxicity were noted, with 50 mg/kg and 250 mg/kg only a slight loss of weight, and with 250 mg/kg mildly elevated cardiovasculartoxicity was found.
History
Irreversible MAOI antidepressants were discovered accidentally in the 1950s but their popularity declined as their toxicity especially their dangerous food interactions became apparent and rival tricyclic antidepressants were discovered. Reversible MAOIs were developed in the hope that they would exert efficacy in depressive disorders but with less of the toxicity of the older irreversible compounds; moclobemide's discovery and marketing brought the renewed interest in MAOIs due to an absence of dangerous tyramine food interactions and potent antidepressant effects.[17][123] In 1992 moclobemide was launched onto the world markets.[124] Moclobemide was the first reversible MAO-A inhibitor to be widely marketed.[125] Moclobemide as well as other newer antidepressants such as the SSRIs led to changes in prescribing patterns and broadened the treatment options for the management of depressive disorders.[126]
When moclobemide was discovered in 1972 in Switzerland,
Society and culture
The Australian TGA approved moclobemide in December 2000.[14]
Brands
It is sold under many trade names worldwide.[131]
Brand name listings
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It is sold under many trade names worldwide including Apo-Moclob, Apo-Moclobemide, Auromid, Aurorix, Bei Su, Biorix, Depnil, Eutac, Hai Bei Lin, Langtian, Manerix, Mobemid, Moclamine, Moclo A, Moclobemid - 1 A Pharma, Moclobemid AL, Moclobemid HEXAL, Moclobemid ratiopharm, Moclobemida, Moclobemida Genedec, Moclobemida Teva, Moclobemide Actavis, Moclobemide Aurobindo, Moclobemide CF, Moclobemide Mylan, Moclobemide Sandoz, Moclobemide Sopharma, Moclobemide Teva, Moclobemid-neuraxpharm, Moclobemid-ratiopharm, Moclobeta, Moclod, moclodura, Moclostad, Mocrim, Moklar, Teva-Moclobemide, Tian Tai, Ya Zheng, and Zorix.[131] |
See also
References
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Further reading
- Scientific Information on Aurorix (German)
- PubChem Substance Summary: Moclobemide National Center for Biotechnology Information.