Maprotiline

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Maprotiline
Maprotiline structure.svg
Maprotiline ball-and-stick model.png
Clinical data
Trade names Ludiomil, others
Synonyms Maprotiline hydrochloride; Maprotiline methanesulfonate; Ba 34276[1][2][3]
AHFS/Drugs.com Monograph
MedlinePlus a682158
Pregnancy
category
  • US: B3[in US?]
Routes of
administration
Oral, intramuscular, intravenous
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability 66–70%
Protein binding 88%
Metabolism hepatic
Onset of action 6 hours
Elimination half-life 27–58 hours
Excretion Urine (57%) and bile (30%) as glucuronides, 3–4% as unchanged drug
Identifiers
CAS Number
PubChem CID
  • 4011
IUPHAR/BPS
  • 2402
DrugBank
  • DB00934 ☑Y
ChemSpider
  • 23719117 ☒N
UNII
  • 2U1W68TROF
KEGG
  • D02566 ☑Y
ChEMBL
  • CHEMBL21731 ☑Y
ECHA InfoCard 100.030.532
Chemical and physical data
Formula C20H23N
Molar mass 277.403 g/mol
3D model (JSmol)
  • Interactive image
 ☒N☑Y (what is this?)   (verify)

Maprotiline, sold under the brand name Ludiomil among others, is a tetracyclic antidepressant (TeCA) that is used in the treatment of depression.[4] It may alternatively be classified as a tricyclic antidepressant (TCA), specifically a secondary amine.[4] In terms of its chemistry and pharmacology, maprotiline is closely related to other secondary amine TCAs like nortriptyline and protriptyline, and has similar effects to them.[5][4]

Medical uses

Maprotiline is used in the treatment of depression, such as depression associated with agitation or anxiety and has similar efficacy to the antidepressant drug moclobemide.[6]

  • Treatment of depressions of all forms and severities (endogenous, psychotic, involutional, and neurotic) especially for depression associated with agitation or anxiety
  • Panic disorder
  • Neuropathic pain
  • Treatment of the depressive phase in bipolar depression
  • For the symptomatic relief of anxiety, tension or insomnia

The use of maprotiline in the treatment of enuresis in pediatric patients has so far not been systematically explored and its use is not recommended.[7] Safety and effectiveness in the pediatric population in general have not been established. Anyone considering the use of maprotiline in a child or adolescent must balance the potential risks with the clinical need. In general, lower dosages are recommended for patients over 60 years of age. Dosages of 50 mg to 75 mg daily are usually satisfactory as maintenance therapy for elderly patients who do not tolerate higher amounts.[8][9]

Available forms

  • Coated Tablets, 10 mg, 25 mg, 50 mg, and 75 mg
  • Injectable concentrate, 25 mg

Contraindications

Maprotiline may worsen psychotic conditions like schizophrenia and should be given with caution. The antipsychotic treatment should be continued. Patients with bipolar affective disorder should not receive antidepressants whilst in a manic phase, as antidepressants can worsen mania.

Absolute

  • Hypersensitivity to maprotiline or to other TCAs and TeCAs
  • Hypertrophy of the prostate gland with urine hesitancy
  • Closed angle glaucoma

Special caution needed

  • Concomitant treatment with a MAO-inhibitor
  • Serious impairment of liver and kidney function
  • Epilepsy and other conditions that lower the seizure threshold (active brain tumors, alcohol withdrawal, other medications)
  • Serious cardiovascular conditions (arrhythmias, heart insufficience, state after myocardial infarction etc.)
  • Treatment of patients under age 18[10]

Suicidal patients

Same as other antidepressants, maprotiline increased the risk compared to placebo of suicidal thinking and behavior (suicidality) in children, adolescents and young adults in short-term studies of major depressive disorder (MDD) and other psychiatric disorders. Anyone considering the use of maprotiline or any other antidepressant in a child, adolescent, or young adult must balance this risk with the clinical need. Short-term studies did not show an increase in the risk of suicidality with antidepressants compared to placebo in adults beyond age 24; there was a reduction in risk with antidepressants compared to placebo in adults aged 65 and older. Depression and certain other psychiatric disorders are themselves associated with increases in the risk of suicide. Patients of all ages who are started on antidepressant therapy should be monitored appropriately and observed closely for clinical worsening, suicidality, or unusual changes in behavior. Families and caregivers should be advised of the need for close observation and communication with the prescriber. Maprotiline is not approved for use in pediatric patients.[11]

Pregnancy and lactation

Reproduction studies have been performed in female laboratory rabbits, mice, and rats at doses up to 1.3, 7, and 9 times the maximum daily human dose respectively and have revealed no evidence of impaired fertility or harm to the fetus due to maprotiline. There are, however, no adequate and well controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.

Maprotiline is excreted in breast milk. At steady-state, the concentrations in milk correspond closely to the concentrations in whole blood. Caution should be exercised when maprotiline hydrochloride is administered to a nursing woman.

Side effects

The side-effect profile is comparable to other TCAs and TeCAS and many of the following are due to anticholinergic (which are less prominent than those of most TCAs) and antihistamine effects.[7] Most often seen are:

Maprotiline causes a strong initial sedation (first 2 to 3 weeks of therapy) and is therefore indicated to treat agitated patients or those with suicidal risks. It causes anticholinergic side effects (dry mouth, constipation, confusion, tachycardia) with a lower incidence than amitriptyline. Originally, the manufacturer claimed that maprotiline is better tolerated than other TCAs and TeCAs. However, seizures, leukopenia and skin reactions occur more often with maprotiline than with comparable drugs like amitriptyline.

Maprotiline has no known potential for abuse and psychological dependence.

Withdrawal

Withdrawal symptoms frequently seen when treatment with maprotiline is stopped abruptly (agitation, anxiety, insomnia, sometimes activation of mania or rebound depression) are not indicative of addiction and can be avoided by reducing the daily dose of maprotiline gradually by approximately 25% each week. If treatment has to be stopped at once due to medical reasons, the use of a benzodiazepine (e.g. lorazepam, clonazepam, or alprazolam) for a maximum of 4 weeks as needed will usually suppress withdrawal symptoms.

Interactions

Maprotiline has a wide range of possible interactions. Some are typical for TCAs and TeCAs, others are caused by specific metabolic effects (e.g. high plasma-protein-binding) of maprotiline:

  • Irreversible MAO-inhibitors: agitation, delirium, coma, hyperpyrexia (high fever), seizures and severe changes in blood pressure. Treatment-resistant and hospitalized patients may be treated concomitantly with an MAO-inhibitor, if they are closely monitored and if the initial dose of the MAO-Inhibitor is low.

Increased drug actions:

  • Other antidepressants, barbiturates, narcotics, sedating antihistamines, anticonvulsive drugs, alcohol - resulting in increased central depression
  • Anticholinergics (antiparkinsonian agents, TCAs and TeCAs) - resulting in increased anticholinergic action (dry mouth, constipation etc.)
  • Sympathomimetics (also those used in local anesthetics like noradrenaline) : sympathomimetic effects increased (increased blood pressure, pulse rate, paleness of skin etc.)
  • Nitrates and antihypertensives (e.g. beta-blockers) - increased antihypertensive action with pronounced fall in blood pressure

Decreased drug actions:

  • Guanethidine, Reserpine, Guanfacine : antihypertensive effects decreased
  • Clonidine : antihypertensive effects decreased and risk of (massive) rebound hypertension.

Other types of interaction:

  • Drugs, which induce certain enzymes in the liver, e.g. barbiturates, phenytoin, carbamazepine and oral anticonceptive drugs, enhance the elimination of maprotiline and decrease its antidepressant effects. Additionally the blood-concentrations of phenytoin or carbamazepine may be increased, leading to a higher incidents of side effects.
  • The concomitant use of maprotiline and neuroleptics can lead to increased maprotiline blood-levels and to seizures. Combining maprotiline and thioridazine could induce severe arrhythmias.
  • Additionally, increased blood-levels of Maprotiline are possible, if certain beta-blocking agents (e.g. Propranolol) are given concomitantly.
  • Maprotiline may amplify the actions of coumarin-type anticogulants (e.g. warfarin, phenprocoumon). The plasma-prothrombin-activity must be assessed closely in order to avoid overt bleedings.
  • Maprotiline can increase the actions of oral antidiabetic drugs (sulfonylureas) and Insulin. Diabetic patients should have regular assessments of their blood-glucose-levels.
  • The concomitant application with fluoxetine or fluvoxamine may lead to significantly increased plasma-levels of maprotiline with a high incidence of maprotiline side effects. Due to the long half-lives of fluoxetine and fluvoxamine this effect may persist.

Pharmacology

Pharmacodynamics

Maprotiline[12]
Site Ki (nM) Species Ref
SERT 5,800 Human [13]
NET 11–12 Human [13][14]
DAT 1,000 Human [13]
5-HT2A 51 Rat [15]
5-HT2C 122 Rat [15]
5-HT6 ND ND ND
5-HT7 50 Guinea pig [16]
α1 90 Human [17]
α2 9,400 Human [17]
D1 402 Human [18]
D2 350–665 Human [18][17]
D3 504 Human [18]
D4 ND ND ND
D5 429 Human [18]
H1 0.79–2.0 Human [19][18][20][17]
H2 776 Human [19]
H3 66,100 Human [18]
H4 85,100 Human [19][19]
mACh 570 Human [21][17]
Values are Ki (nM). The smaller the value, the more strongly the drug binds to the site.

Maprotiline exhibits strong effects as a norepinephrine reuptake inhibitor with only weak actions the reuptake of serotonin and dopamine.[22][7] It is also a strong antagonist of the H1 receptor, a moderate antagonist of the 5-HT2 and α1-adrenergic receptors, and a weak antagonist of the D2 and muscarinic acetylcholine receptors. Maprotiline has also more recently been identified as a potent antagonist of the 5-HT7 receptor, with this action potentially playing an important role in its antidepressant effectiveness.[23] The drug is a strong antihistamine, but unlike most TCAs, has minimal anticholinergic effects.[24]

The pharmacological profile of maprotiline explains its antidepressant, sedative, anxiolytic, and sympathomimetic activities. In accordance to the pharmacological characteristics it is used in the treatment of depression, such as depression associated with agitation or anxiety. Additionally, it shows strong antagonism against reserpine-induced effects in animal studies, as do the other 'classical' antidepressants. Although maprotiline behaves in most regards as a 'first-generation antidepressant' it is commonly referred to as 'second-generation antidepressant'.

The postulated mechanism of maprotiline is that it acts primarily by potentiation of central adrenergic synapses by blocking reuptake of norepinephrine at nerve endings. This pharmacological action is thought to be primarily responsible for the drug's antidepressant and anxiolytic effects. It is a strong norepinephrine reuptake inhibitor with only weak effects on serotonin and dopamine reuptake. At higher doses however, maprotiline increases serotonergic transmission and increases the level of serotonin available.[25]

Pharmacokinetics

After oral use absorption is good. It binds to plasma proteins 80–90%. Maximal plasma concentration is reached 6 hours after use. The mean time to peak is 12 hours. The terminal half-life of averages 51 hours.

Chemistry

An alternative structural representation of the central ring of maprotiline.
A 3D representation of the structure of maprotiline. Notice the bridge in the central ring.

Maprotiline is a tetracyclic compound and is grouped with the TeCAs.[5][4] Its chemical name is N-methyl-9,10-ethanoanthracen-9(10H)-propylamine.[26] The drug has a dibenzobicyclo[2.2.2]octadiene (9,10-dihydro-9,10-ethanoanthracene) ring system; that is, a tricyclic anthracene ring system with an ethylene bridge across the central ring.[5][4] This results in it having a unique three-dimensional central ring (a bicyclo[2.2.2]octane or 1,4-endoethylenecyclohexane ring) and being a tetracyclic rather than a tricyclic compound.[5] However, it could also or alternatively be considered to be a tricyclic and hence a TCA.[4] In addition to its heterocyclic ring system, maprotiline has an alkylamine side chain attached similarly to other TCAs (but notably unlike other TeCAs).[5][4] In terms of the side chain, it is a secondary amine,[4] and its chemical structure, aside from the ethylene link in the central ring, is similar to that of secondary amine TCAs like nortriptyline and protriptyline.[5][26] In accordance, the pharmacology of maprotiline is very similar to that of secondary amine TCAs.[5][4]

Maprotiline is very similar in structure to the anxiolytic, sedative, and muscle relaxant drug benzoctamine (Tacitin).[5][27] The only structural difference between the two compounds is in the length of their side chain.[5][27] However, this modification results in considerable differences in their pharmacological and therapeutic effects.[5][27]

History

Maprotiline was developed by Ciba (now operated by Novartis).[28] It was patented in 1966 and was first described in the literature in 1969.[28] The drug was introduced for medical use in 1974.[28][29] Generics are now widely available. It was introduced after most of the other TCAs but was the first TeCA to be developed and marketed, with the TeCAs mianserin and amoxapine following shortly thereafter and mirtazapine being introduced later on.[28][29]

Society and culture

Ludiomil (maprotiline) 25 mg tablets by Ciba-Geigy.

Generic names

Maprotiline is the English and French generic name of the drug and its INN, USAN, BAN, and DCF, while maprotiline hydrochloride is its USAN, USP, BANM and JAN.[1][2][30][3] Its generic name in Spanish and Italian and its DCIT are maprotilina, in German is maprotilin, and in Latin is maprotilinum.[2][3] The methanesulfonate (mesylate) salt is known unofficially as maprotiline methanesulfonate.[2][3]

Brand names

Maprotiline is marketed throughout the world mainly under the brand name Ludiomil.[2][3] It is also available under a variety of other brand names including Deprilept, Maprolu, and Psymion among others.[2][3]

References

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  11. ^ U.S. National Library of Medicine. Last Reviewed 1 Sept. 2010 Medline Plus entry for Maprotiline
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