Moclobemide: Difference between revisions

Moclobemide
	File:Moclobemide.svg
Clinical data
Trade names	Amira, Aurorix, Clobemix, Depnil, Manerix
AHFS/Drugs.com	Micromedex Detailed Consumer Information
Pregnancy; category	AU: B3 ; ;
Routes of; administration	oral
ATC code	N06AG02 (WHO) ;
Legal status
Legal status	AU: S4 (Prescription only) ; CA: ℞-only ; UK: POM (Prescription only) ;
Pharmacokinetic data
Bioavailability	55-95% (increases with repeat administration)
Protein binding	50%
Metabolism	Hepatic
Elimination half-life	1-2 hours, 4 hours (elderly)
Excretion	Renal, Faecal (<5%)
Identifiers
	IUPAC name 4-chloro-N-(2-morpholin-4-ylethyl)benzamide;
CAS Number	71320-77-9 ;
PubChem CID	4235;
DrugBank	DB01171 ;
ChemSpider	4087 ;
UNII	PJ0Y7AZB63;
KEGG	D02561 ;
ChEBI	CHEBI:83531 ;
ChEMBL	ChEMBL86304 ;
E number	{{#property:P628}}
ECHA InfoCard	{{#property:P2566}}Lua error in Module:EditAtWikidata at line 36: attempt to index field 'wikibase' (a nil value).
Chemical and physical data
Formula	C13H17ClN2O2
Molar mass	268.739 g/mol
3D model (JSmol)	Interactive image;
	SMILES Clc1ccc(cc1)C(=O)NCCN2CCOCC2;
	InChI InChI=1S/C13H17ClN2O2/c14-12-3-1-11(2-4-12)13(17)15-5-6-16-7-9-18-10-8-16/h1-4H,5-10H2,(H,15,17) ; Key:YHXISWVBGDMDLQ-UHFFFAOYSA-N ;
(what is this?) (verify)

VisualWikitext

Revision as of 17:20, 7 April 2015

Moclobemide (sold as Amira, Aurorix,^[7] Clobemix , Depnil and Manerix^[8]) is a reversible monoamine oxidase inhibitor (MAOI) drug primarily used to treat depression and social anxiety.^[9]^[10]^[11] It is not approved for use in the United States,^[12] but is approved in other Western countries such as the UK^[11] and Australia (TGA approved in December 2000).^[13] It is produced by affiliates of the Hoffmann–La Roche pharmaceutical company. Initially, Aurorix was also marketed by Roche in South Africa, but was withdrawn after its patent rights expired and Cipla Medpro's Depnil and Pharma Dynamic's Clorix became available at half the cost.

No significant rise in blood pressure occurs when moclobemide is combined with amines such as tyramine containing foods or pressor amine drugs, unlike the older non-selective irreversible MAOIs which cause a severe rise in blood pressure with such combination.^[9] Due to the lack of anticholinergic, cardiovascular, cognitive and psychomotor impairments moclobemide is advantageous in the elderly as well as those with cardiovascular disease.^[9]

Medical uses

Reversible selective MAOIs such as moclobemide are widely underprescribed due to the misconception that the side effect profile of moclobemide is analogous to that of the irreversible and non-selective MAOIs.^[14] MAOIs such as moclobemide are reported to have a relatively fast onset of action compared to other antidepressant drug classes,^[15] and have good long-term tolerability in terms of side effects.^[16]

Tolerance does not seem to occur; research has found that moclobemide retains its beneficial therapeutic properties in depression for at least a year.^[17]

Unipolar depression. Moclobemide has demonstrated effectiveness and efficacy in the treatment and management of major depressive disorder,^[18] with both endogenous and non-endogenous depression responding; in addition moclobemide has a fast onset of action compared to other antidepressants and is significantly more tolerable than the tricyclic antidepressants.^[19] Due to a very good safety profile and very low incidence of side effects moclobemide is likely to have a high level of acceptability by individuals suffering from depression.^[20] Higher doses (>450 mg/day) may be more effective in severe depression, while patients treated with a lower dose tend to respond less well than those treated with tricyclic antidepressants.^[21]

Psychotic depression, unipolar endogenous depression, melancholic depression, retarded depression, agitated depression and neurotic depression all respond to moclobemide.^[22] As does atypical depression.^[23] Unipolar endogenous depression is reported to have the best response to moclobemide therapy.^[24]^[25] Individuals suffering from depression who are given moclobemide are twice as likely to improve on moclobemide than on placebo.^[26] A concern of antidepressant adverse effects is sexual dysfunction; however, moclobemide has actually been found to increase the libido and also improve impaired erection, ejaculation and orgasm.^[27] 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.^[28]

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.^[29]

Bipolar depression. While not generally recommended as a monotherapy for bipolar depression (as with all antidepressants) in one clinical trial it appeared (although statistical significance at the p=0.05 was not reached) as though moclobemide was equally effective as imipramine at reducing depressive symptoms, but had a significantly lower risk of causing a manic switch.^[30] This is in line with recent findings that MAOIs as a class are superior to other antidepressants (in terms of both their relatively low rate of manic switching and their efficacy) in the treatment of bipolar depression.^[31]

Dysthymia; moclobemide has been found to be effective in the treatment and management of this depressive disorder.^[32]

Social phobia. Moclobemide has been found to be effective for the treatment of social anxiety disorder in both short and long-term placebo controlled clinical trials.^[33] Moclobemide is effective but not as effective as the irreversible MAOIs in the treatment of social phobia.^[34] Maximal benefits can take 8 – 12 weeks to manifest.^[35] There is a high risk of treatment failure if there is co-morbid alcohol abuse, however.^[36] The Australian Medicines Handbook lists social phobia as an accepted but not a licensed indication.^[10]

Smoking cessation. Moclobemide has been tested in heavy dependent smokers against placebo based on the theory that tobacco smoking could be a form of self-medicating of major depression,^[37] and moclobemide could therefore help increase abstinence rates due to moclobemide mimicking the MAO-A inhibiting effects of tobacco smoke. Moclobemide 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.^[38]

Panic disorder. Moclobemide is useful in the treatment and management of panic disorder.^[39] Panic disorder is mentioned as an accepted but unlicensed indication in the Australian Medicines Handbook.^[10]

ADHD. Two small studies assessing the benefit of moclobemide in people with attention deficit disorder found that moclobemide produced favourable results.^[22]

Fibromyalgia, moclobemide has been found to improve pain and functioning in this group of people.^[40]

Migraine. Moclobemide has been reported to be effective in the treament of migraine and chronic tension headache.^[41]^[42]

Similar to other MAOIs, reversible MAOIs such as moclobemide may also be effective in a range of other psychiatric disorders.^[22]^[43] Menopausal flushing may also respond to moclobemide.^[44] Moclobemide may also have benefit for some patients with Parkinson's Disease by extending and enhancing the effects of l-dopa.^[45]

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 phenelzine and tranylcypromine. In terms of tolerability, however, moclobemide was found to be comparable to the SSRIs and better tolerated than the TCAs and older MAOIs.^[12] There is some evidence that moclobemide on its own or in combination with other antidepressants such as SSRIs is also effective for treatment resistant depression and that the combination can be administered without the development of serotonin syndrome; however, further research is needed before such a combination can be recommended.^[9]^[46] Follow-up studies show that ongoing use of antidepressants leads to continuing improvement in depression over time; and also have demonstrated that moclobemide retains its therapeutic efficacy as an antidepressant for at least a year. This long-term efficacy is equivalent to that seen with other antidepressant classes.^[14]

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.^[47]^[48]

A dexamethasone suppression test (DST) and plasma and urine methoxyhydroxyphenylglycol (MHPG) test can be used to estimate who is likely to respond to moclobemide antidepressant therapy.^[49]

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.^[8]

Children

Use in children is not recommended as there is insufficient data to assess their safety and efficacy in these patients.^[10]^[11]

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.^[50] Cognitive impairments have been found to improve in people with dementia when depression is treated with moclobemide.^[22] Due to its superior safety profile, moclobemide has been recommended as a first line agent for the treatment of depression in the elderly.^[51] Due to the side effect profile of moclobemide, it may be a better option for this sub group of people than other antidepressants.^[52] Research has found evidence that moclobemide may be able to counter cholinergic induced cognitive impairments thus making moclobemide a good choice in the depression in the elderly and those with dementia.^[53]

Adverse effects

The incidence of adverse events is not correlated with age; however, adverse events occur more often in females than in males.^[54] 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.^[55] Side effects of moclobemide are exceptionally low,^[20] with insomnia, headache and dizziness being the most commonly reported side effects in the initial stages of therapy with moclobemide.^[56] Many antidepressants have an adverse effect on sexual function; however, treatment with moclobemide has actually been found to improve sexual function.^[57] Moclobemide does not have any adverse effect on cognitive abilities, thus there are no impairments of moclobemide therapy on memory, attention functions nor is ability to drive a motor vehicle affected adversely.^[58] In fact, moclobemide has been found to improve cognition, especially memory; this is relevant with regard to the elderly as adverse effects on cognition are of particular concern in this population. People with dementia and comorbid depression also show improvements in cognitive impairments; these improvements are unrelated to alleviation of depression. Alcohol related cognitive impairments are also improved by moclobemide. Improvements in cognition also occur in young depressed people after 6 weeks of treatment. There is a mild impairment in psychometric performance in elderly people but none in younger people. Moclobemide, even at high doses of 600 mg, does not impair the ability to drive a motor vehicle.^[8]^[59] The tolerability of moclobemide is similar in women and men and it is also well tolerated in the elderly.^[60] Moclobemide is tolerated to a similar degree to the SSRI antidepressants, although unlike SSRIs moclobemide does not cause sexual dysfunction and gastrointestinal disturbance is less common. 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^[9] as well as not causing weight gain.^[59]

Unlike the irreversible MAOIs there is no evidence of liver toxicity with moclobemide.^[61] Moclobemide has a similar efficacy profile compared to other antidepressants but is significantly superior to the tricyclic antidepressants and the classic (unselective or irreversible) MAOIs, in terms of tolerance and safety profile.^[62] Moclobemide has little effect on psychomotor functions.^[63] Other side effects include, nausea, insomnia, tremor and lightheadedness; orthostatic hypotension is uncommon even among the elderly.^[12] Behavioural toxicity or other impairments relating to everyday living does not occur with moclobemide, except in doses of 400 mg or higher, peripheral reaction time may be impaired.^[64] Peripheral oedema has been associated with moclobemide.^[65]

Most of the side effects are transient disappearing within 2 weeks of treatment.^[66] tiredness, headache, restlessness, nervousness and sleep disturbances have been described as side effects from moclobemide therapy.^[67] A paradoxical worsening of depression has been reported in some individuals in several studies,^[68] and reports of suicidal ideation and suicide as an adverse effect have been reported as a rare adverse effect of moclobemide.^[69] Overall, antidepressants decrease the risk of suicide.^[70] Moclobemide is believed to have only small proconvulsant effects;^[71] however, rarely seizures may occur.^[72] Hypertension, has been reported to occur very rarely with moclobemide therapy.^[12]

Moclobemide is relatively well tolerated. The following are the potential adverse effects and their respective incidences:^[13]^[73]

Common (>1% incidence) adverse effects

Nausea
Dry mouth
Constipation
Diarrhoea
Insomnia
Dizziness
Anxiety
Restlessness

Uncommon/Rare (<1%) adverse effects

Difficulties falling asleep
Nightmares/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
Meteorism
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:^[10]

Confusional states
Bipolar disorder (although it seems less likely than imipramine to cause a manic switch^[30])
Phaeochromocytoma

and caution is recommended in:^[11]

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.^[74] There is little increase in the effects of alcohol when combined with moclobemide^[74] and, in fact, moclobemide causes a reduction in alcohol-related impairments.^[63] Moclobemide also interacts with pethidine/meperidine,^[75] and dextropropoxyphene.^[62] Ephedrine in combination with moclobemide increases the risk of cardiovascular adverse effects.^[76] Moclobemide is also likely to interact with warfarin.^[77]

Serotonin syndrome has been reported when moclobemide has been taken in combination with other serotonin enhancing drugs; however, due to moclobemide's reversible MAO inhibition, serotonin syndrome is significantly less likely to occur with moclobemide than with older irreversible MAOIs.^[10]^[78]^[79] Serotonin syndrome has been reported when trazodone was abruptly replaced with moclobemide.^[80] Taking at the same time or starting moclobemide too soon after discontinuing clomipramine, or other serotonin reuptake inhibitors, such as SSRIs may result in the development of a serotonin syndrome.^[62]^[81] SNRIs, such as venlafaxine in combination with moclobemide have also been associated with serotonin syndrome.^[82] Cimetidine, causes a doubling of the blood plasma levels of moclobemide.^[8] Blood plasma levels of trimipramine and maprotiline and possibly other tricyclic antidepressants increase when used in combination with moclobemide and may require dosage adjustments if the combination is used for treatment resistant depression.^[83] The elimination of zolmitriptan is reduced by moclobemide and if the combination is used, a dosage reduction of zolmitriptan is recommended.^[84] Moclobemide reduces the metabolism of dextromethorphan.^[85]

Dietary

Irreversible MAOIs can cause unpleasant and occasionally dangerous side effects such as a hypertensive crises after intake of food or drink containing indirectly acting sympathomimetic amines such as tyramine. This is sometimes referred to as the 'cheese effect'. These side effects are due to irreversible inhibition of MAO in the gut and vasomotor neurones. However, the reversible MAOI antidepressants such as moclobemide have a very different side effect profile in this regard.^[8] The reversible binding to MAO-A by moclobemide allows amines such as tyramine to displace moclobemide from MAO-A allowing its metabolism and removing the risk of a hypertensive crisis that occurs with irreversible MAO inhibition.^[86] Of 2300 people in multiple clinical trials who were treated with moclobemide in doses up to 600 mg with no dietary restrictions, none experienced a tyramine-mediated hypertensive reaction.^[60] As the pressor effect of moclobemide is so low, dietary restrictions are not necessary in people eating a normal diet, in contrast to irreversible MAOIs.^[9] However, some rare cheeses that have a high tyramine level may possibly cause a pressor effect and require caution.^[87] The potentiation of the pressor effect of tyramine by moclobemide is only one seventh to one tenth of that of irreversible MAOIs.^[88] In order to minimize this potentiation, postprandial administration (taken after meals) of moclobemide is recommended.^[8] The combined use of moclobemide and selegiline requires dietary restrictions as the combination can lead to increased sensitivity to the pressor effect of foods containing tyramine.^[89]

The combination of moclobemide with prescription or over the counter sympathomimetic drugs is not recommended due to the potential of significant drug interactions.^[90] While moclobemide or the irreversible MAO-B selective inhibitor selegiline taken alone has very little pressor effect, and requires no dietry restriction, the combination of seligiline 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.^[91] The combination of moclobemide and a reversible MAO-B inhibitor requires tyramine dietary restrictions.^[92]

Overdose

Moclobemide is considered to be less toxic in overdose compared to older antidepressants, such as the tricyclic antidepressants and nonselective, irreversible MAO inhibitors,^[9] making it a safer antidepressant in the elderly or people with physical disorders.^[59] Of 18 people who overdosed on moclobemide during clinical trials, all recovered fully and moclobemide was judged to be safe for in as well as outpatient use.^[93] Intoxications with moclobemide as single agent are usually mild; however, when combined with tricyclic or SSRI antidepressants the overdose much more toxic and potentially fatal.^[94]^[95] Moclobemide, is preferred by doctors for patients who are at risk of suicide, due to moclobemide's low toxicity in overdose.^[96] 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; a single report of relatively mild flu-like symptoms persisting for 7 days after rapid reduction of high dose mocloemide therapy has been reported in one patient.^[97] Withdrawal of moclobemide causes a rebound in REM Sleep.^[8]

Moclobemide does not prevent withdrawal symptoms from serotonin reuptake inhibitors.^[98]

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.^[14]

Pharmacology

A picture of 150 mg tablets of the reversible MAOI drug moclobemide, brand name Aurorix.

Moclobemide is a benzamide,^[12] derivative of morpholine,^[99] which acts pharmacologically as a selective, reversible inhibitor of monoamine oxidase A (RIMA),^[9] a type of monoamine oxidase inhibitor (MAOI), and increases levels of norepinephrine (noradrenaline), dopamine, and especially serotonin.^[100]^[101] in neuronal cells as well as in synaptic vesicles; extracellular levels also increase which results in increased monoamine receptor stimulation and suppression of REM sleep, down regulation of 3-adrenoceptors. A single 300 mg dose of moclobemide inhibits 80% of monoamine oxidase A (MAO-A) and 30% of monoamine oxidase B (MAO-B), blocking the decomposition of norepinephrine, serotonin and, to a lesser extent, dopamine. There is also some evidence pointing towards moclobemide possessing neuroprotective properties.^[8] There is no cumulative effect of moclobemide centrally when taken long-term.^[8] With long-term use of moclobemide, there is a significant down-regulation of B-adrenoceptors.^[8] Single or repeated dosing with 100–300 mg of moclobemide leads to a reduction in deaminated metabolites of amines such as 3,4-dihydroxyphenylacetic acid, 3,4-dihydroxyphenylethylglycol as well as 5-HIAA. Excretion of homovanillic acid and vanillylmandelic acid via urine is also reduced. There is also a temporary increase in prolactin during initial intake of 100–300 mg of moclobemide.^[8] L-dihydroxyphenylalanine is also reduced.^[102] However, suppression of the serotonin metabolite is less pronounced than the inhibition of the metabolite of noradrenaline which suggest there are other major metabolic pathways for serotonin other than MAO-A.^[103]

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.^[8] With three times daily dosing the inhibition on MAO-A was relatively constant with moclobemide.^[104] The MAO inhibition of moclobemide lasts about 8–10 hours and wears off completely by 24 hours after dosing.^[8]^[101] The inhibition of MAO-A by moclobemide is 10 times more potent than the irreversible MAOIs phenelzine and approximately equivalent to tranylcypromine and isocarboxazid.^[8]

Moclobemide increases levels of extracellular monoamines and decreases levels of their metabolites in rat brains; tolerance to these effects does not seem to occur with chronic use of moclobemide. Moclobemide lacks anticholinergic effects and cognitive impairments can be improved by moclobemide.^[105] Moclobemide suppresses the unstimulated release of certain proinflammatory cytokines which are believed to be involved in the pathophysiology of major depression and stimulates the release of anti-inflammatory cytokines.^[106] Long-term treatment with moclobemide leads to an increase in cyclic adenosine monophosphate (cAMP) binding to cAMP-dependent protein kinase (PKA).^[107]

Moclobemide is chemically unrelated to irreversible MAOI antidepressants and only has a very weak pressor effect of orally administered tyramine.^[108] 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.^[8]

In healthy people moclobemide has a relatively small suppressing effect on REM sleep; in contrast, depressed people who have been treated with moclobemide, progressively show improved sleep over a 4-week period, with an increase in stage 2 non-rapid eye movement (NREM) sleep and rapid eye movement (REM) sleep.^[8] There have been conflicting findings with regard to moclobemide altering cortisol levels and whether moclobemide increases growth hormone levels.^[8] Testosterone levels increase significantly with long-term use of moclobemide in depressed males.^[109]

Moclobemide also has neuroprotective properties in its demonstrated anti-hypoxia or anti-ischemia effects; there is a possibility that moclobemide may possess similar neuro-rescuing properties, similar to selegiline, however, research is required to determine this.^[8] Moclobemide has also been demonstrated in a single dose research study to possess antinociceptive properties.^[110]

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.^[111] 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,^[112] 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).

As MAO inhibition returns completely back to normal after 24 hours, which allows for changing to another antidepressant within 24 hours of the last dose taken of moclobemide.^[8]

Pharmacokinetics

In humans moclobemide is rapidly and almost completely absorbed and totally metabolised via the liver.^[113] 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.^[8]^[114] It is moderately bound to plasma proteins, especially albumin.^[8] 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.^[113] 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.^[115] Less than 1 percent of the drug is excreted unchanged; 92 percent of the metabolised drug is excreted within the first 12 hours.^[116] 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.^[8]

Steady state concentrations are established after one week.^[113] It has been suggested that changes in dose should not be made with a gap of no less than a week.^[122] Moclobemide has good penetration across the blood brain barrier with peak plasma levels within the central nervous system occurring 2 hours after administration.^[123]

Animal toxicology

Acute toxicity: The oral Template:LD50 values in mouse and rat are quite high, indicating a wide therapeutic index. LD₅₀ for mice is 730 mg/kg and for rats 1,300 mg/kg. In dogs doses in excess of 300 mg/kg led to vomiting, salivation, ataxia, and 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 Alkaline phosphatase and Gamma-GT. Studies in dogs revealed no toxicity relevant for humans. No evidence for a possible hepatic or cardiovascular toxicity 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 the 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.^[16]^[124] In 1992 moclobemide was launched onto the world markets.^[125] Moclobemide was the first reversible MAO-A inhibitor to be widely marketed;^[126] Moclobemide as well as other newer antidepressants such as the SSRIs lead to changes in prescribing patterns and broadened the treatment options for the management of depressive disorders.^[127]

The discovery of moclobemide in 1972 in Switzerland,^[12] as an antidepressant came about after it was initially investigated as a possible lipid lowering drug or antibiotic; when tests failed to demonstrate any antibiotic or antilipaemic properties; it was then tested for anti-cholinergic properties to see if it was a possible antidepressant but these tests also proved negative, leading researchers to think it may, in fact, be an antipsychotic; finally its reversible MAO-A properties as well as its lack of tyramine pressor effect. Clinical trials were commenced for moclobemide's effectiveness in the treatment of depression.^[128] It was first approved in the UK and Europe as the first reversible and selective inhibitor of MAO-A an is now approved in over 50 countries world wide.^[12] Subsequent research found that moclobemide is well tolerated in elderly patients^[129] and far superior to tricyclic antidepressants in terms of side effects/tolerability as well as being much safer in overdose; with regard to effectiveness in the treatment of depression, moclobemide was determined to be as effective as all major antidepressant drug classes. There is no need for dietary restrictions in contrast to people on irreversible MAOIs and apart from an important interaction with other serotonergic enhancing agents such as SSRIs and pethidine, there are few serious drug interactions; because of these benefits of moclobemide over existing antidepressant drugs, moclobemide became regarded as a beneficial addition to medical 'prescribing arsenal'.^[79]^[130] Additionally moclobemide was found to, unlike most other antidepressants on the market, to actually improve all aspects of sexual function.^[131] It is the only reversible MAOI in use in clinical practice.^[8] The fact that moclobemide's pharmacokinetic properties are unaltered by age, that cognition is improved in the elderly, and moclobemide has low potential for food and drug interactions opened up a new avenue for the treatment of major depressive disorder.^[8] Due to a lack of financial incentive, such as the costs of conducting the necessary trials to gain approval, moclobemide is unavailable in the USA pharmaceutical market.^[12]

References

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