Chemistry:Milnacipran

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Short description: Antidepressant
Milnacipran
Milnacipran structure.svg
Milnacipran3Dan.gif
Top: (1S,2R)-milnacipran (L-milnacipran)
Bottom: (1R,2S)-milnacipran (D-milnacipran)
Clinical data
Trade namesIxel, Joncia, Savella
AHFS/Drugs.comMonograph
MedlinePlusa609016
Pregnancy
category
  • AU: B3
  • US: C (Risk not ruled out)
Routes of
administration		By mouth (tablets), capsules)
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability85%
Protein binding13%
MetabolismHepatic
Elimination half-life8 hours
ExcretionRenal
Identifiers
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEMBL
Chemical and physical data
FormulaC15H22N2O
Molar mass246.354 g·mol−1
3D model (JSmol)
ChiralityRacemic mixture
  (verify)

Milnacipran (trade names Ixel, Savella, Dalcipran, Toledomin) is a serotonin–norepinephrine reuptake inhibitor (SNRI) used in the clinical treatment of fibromyalgia. It is not approved for the clinical treatment of major depressive disorder in the US, but it is in other countries.

Medical uses

Depression

In a pooled analysis of 7 comparative trials with imipramine,[1] milnacipran and imipramine were shown to have comparable efficacy while milnacipran was significantly better tolerated. A pooled analysis of studies comparing milnacipran and SSRIs[2] concluded a superior efficacy for milnacipran with similar tolerability for milnacipran and SSRIs. A more recent meta-analysis of 6 studies involving more than 1,000 patients showed no distinction between milnacipran and SSRIs in efficacy or discontinuation rates, including discontinuation for side effects or lack of efficacy.[3] A meta-analysis of a total of 16 randomized controlled trials with more than 2200 patients[4] concluded that there were no statistically significant differences in efficacy, acceptability and tolerability when comparing milnacipran with other antidepressant agents. However, compared with TCAs, significantly fewer patients taking milnacipran dropped out due to adverse events. As with other antidepressants, 1 to 3 weeks may elapse before significant antidepressant action becomes clinically evident.

Fibromyalgia

During its development for fibromyalgia, milnacipran was evaluated utilizing a composite responder approach. To be considered as a responder for the composite ‘treatment of fibromyalgia’ endpoint, each patient had to show concurrent and clinically meaningful improvements in pain, physical function, and global impression of disease status. A systematic review in 2015 showed moderate relief for a minority of people with fibromyalgia. Milnacipran was associated with increased adverse events when discontinuing use of the drug.[5]

Social anxiety

There is some evidence that milnacipran may be effective for social anxiety.[6]

Contraindications

Administration of milnacipran should be avoided in individuals with the following:

  • Known hypersensitivity to milnacipran (absolute contraindication)
  • Patients under 15 years of age (no sufficient clinical data)
  • Concomitant treatment with irreversible MAO inhibitors (e.g. tranylcypromine (Parnate), phenelzine (Nardil), >10 mg selegiline) or digitalis glycosides is an absolute contraindication.

Administration of milnacipran should be done with caution in individuals with the following:

  • Concomitant treatment with parenteral epinephrine, norepinephrine, with clonidine, reversible MAO-A Inhibitors (such as moclobemide, toloxatone) or 5-HT1D-agonists (e.g. triptan migraine drugs)
  • Advanced renal disease (decreased dosage required)
  • Hypertrophy of the prostate gland (possibly urination hesitancy induced), with hypertension and heart disease (tachycardia may be a problem) as well as with open angle glaucoma.

Milnacipran should not be used during pregnancy because it may cross the placenta barrier and no clinical data exists on harmful effects in humans and animal studies. Milnacipran is contraindicated during lactation because it is excreted in the milk, and it is not known if it is harmful to the newborn.

Side effects

The most frequently occurring adverse reactions (≥ 5% and greater than placebo) were nausea, headache, constipation, dizziness, insomnia, hot flush, hyperhydrosis, vomiting, palpitations, heart rate increase, dry mouth, and hypertension [FDA Savella prescribing information]. Milnacipran can have a significant impact on sexual functions, including both a decrease in sexual desire and ability[citation needed]. Milnacipran can cause pain of the testicles in men. The incidence of cardiovascular and anticholinergic side effects was significantly lower compared to TCAs as a controlled study with over 3,300 patients revealed. Elevation of liver enzymes without signs of symptomatic liver disease has been infrequent. Mood swing to mania has also been seen and dictates termination of treatment. In psychotic patients emergence of delirium has been noticed. Milnacipran has a low incidence of sedation but improves sleep (both duration and quality) in depressed patients. In agitated patients or those with suicidal thoughts additive sedative/anxiolytic treatment is usually indicated.[7]

Interactions

  • MAOIs — hyperserotonergia (serotonin syndrome), potentially lethal hypertensive crisis
  • 5-HT1 receptor agonists — coronary vasoconstriction with risk of angina pectoris and myocardial infarction
  • Epinephrine, norepinephrine (also in local anesthesia) — hypertensive crisis and/or possible cardiac arrhythmia
  • Clonidine — antihypertensive action of clonidine may be antagonized
  • Digitalis — hemodynamic actions increased
  • Triptans — there have been rare postmarketing reports of hyperserotonergia (serotonin syndrome). If concomitant treatment of milnacipran with a triptan is clinically warranted, careful observation of patient is advised when starting or increasing dosages.[8]
  • Alcohol — no interactions known; however, because milnacipran can cause mild elevation of liver enzymes, caution is recommended; the FDA advises against the concomitant use of alcohol and milnacipran

Pharmacology

Pharmacodynamics

Milnacipran inhibits the reuptake of serotonin and norepinephrine in an approximately 1:3 ratio, respectively. Milnacipran exerts no significant actions on H1, α1, D1, D2, and mACh receptors, nor on benzodiazepine and opioid binding sites.[9][10][11]

Recently, levomilnacipran, the levorotatory enantiomer of milnacipran, has been found to act as an inhibitor of beta-site amyloid precursor protein cleaving enzyme-1 (BACE-1), which is responsible for β-amyloid plaque formation, and hence may be a potentially useful drug in the treatment of Alzheimer's disease.[12] Other BACE-1 inhibitors, such as CTS-21166 (ASP1720), MK-8931, and AZD3293 were in clinical trials for the treatment of Alzheimer's disease,[13] but in both cases clinical trials were halted due to a lack of positive evidence of a favorable benefit to risk ratio and both were considered unlikely to return satisfactory results.

Pharmacokinetics

Milnacipran is well absorbed after oral dosing and has a bioavailability of 85%. Meals do not have an influence on the rapidity and extent of absorption. Peak plasma concentrations are reached 2 hours after oral dosing. The elimination half-life of 8 hours is not increased by liver impairment and old age, but by significant renal disease. Milnacipran is conjugated to the inactive glucuronide and excreted in the urine as unchanged drug and conjugate. Only traces of active metabolites are found.[11]

History

Milnacipran was first approved for the treatment of major depressive episodes in France in December 1996. It is currently marketed (as Ixel) for this indication in over 45 countries worldwide including several European countries such as Austria, Bulgaria, Finland , France , Portugal, and Russia . It is also available in Japan (as Toledomin) and Mexico (as Dalcipran). Cypress Bioscience bought the exclusive rights for approval and marketing of the drug for any purpose in the United States and Canada in 2003 from the manufacturer Laboratoires Pierre Fabre.

In January 2009 the U.S. Food and Drug Administration (FDA) approved milnacipran (under the brand name Savella) only for the treatment of fibromyalgia, making it the third medication approved for this purpose in the United States. In July and November 2009, the European Medicines Agency refused marketing authorization for a milnacipran product (under the brand name Impulsor) for the treatment of fibromyalgia.[14]

References

  1. ↑ "Comparative studies with milnacipran and tricyclic antidepressants in the treatment of patients with major depression: a summary of clinical trial results". International Clinical Psychopharmacology 11 (Suppl 4): 35–9. September 1996. doi:10.1097/00004850-199609004-00005. PMID 8923125. 
  2. ↑ "Milnacipran and selective serotonin reuptake inhibitors in major depression". International Clinical Psychopharmacology 11 (Suppl 4): 41–6. September 1996. doi:10.1097/00004850-199609004-00006. PMID 8923126. 
  3. ↑ "A meta-analysis of clinical trials comparing milnacipran, a serotonin--norepinephrine reuptake inhibitor, with a selective serotonin reuptake inhibitor for the treatment of major depressive disorder". European Neuropsychopharmacology 17 (1): 32–6. January 2007. doi:10.1016/j.euroneuro.2006.05.001. PMID 16762534. 
  4. ↑ Nakagawa, Atsuo, ed (July 2009). "Milnacipran versus other antidepressive agents for depression". The Cochrane Database of Systematic Reviews 8 (3): CD006529. doi:10.1002/14651858.CD006529.pub2. PMID 19588396. 
  5. ↑ "Milnacipran for pain in fibromyalgia in adults". The Cochrane Database of Systematic Reviews 2019 (10): CD008244. October 2015. doi:10.1002/14651858.CD008244.pub3. PMID 26482422. 
  6. ↑ "Japanese experience with milnacipran, the first serotonin and norepinephrine reuptake inhibitor in Japan". Neuropsychiatric Disease and Treatment 3 (1): 41–58. February 2007. doi:10.2147/nedt.2007.3.1.41. PMID 19300537. 
  7. ↑ "www.accessdata.fda.gov". http://www.accessdata.fda.gov/drugsatfda_docs/label/2013/022256s014s015lbl.pdf. 
  8. ↑ "SAVELLA - milnacipran hydrochloride tablet, film coated". DailyMed. National Institute of Health. http://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=08214b30-3dab-4621-a6c0-6bb68529dee3. 
  9. ↑ "Biochemical profile of midalcipran (F 2207), 1-phenyl-1-diethyl-aminocarbonyl-2-aminomethyl-cyclopropane (Z) hydrochloride, a potential fourth generation antidepressant drug". Neuropharmacology 24 (12): 1211–9. December 1985. doi:10.1016/0028-3908(85)90157-1. PMID 3005901. 
  10. ↑ "Preclinical pharmacology of milnacipran". International Clinical Psychopharmacology 11 (Suppl 4): 9–14. September 1996. doi:10.1097/00004850-199609004-00002. PMID 8923122. 
  11. ↑ 11.0 11.1 "Pharmacology and pharmacokinetics of milnacipran". International Clinical Psychopharmacology 17 (Suppl 1): S25-35. June 2002. doi:10.1097/00004850-200206001-00004. PMID 12369608. 
  12. ↑ "Fetzima (levomilnacipran), a drug for major depressive disorder as a dual inhibitor for human serotonin transporters and beta-site amyloid precursor protein cleaving enzyme-1". CNS & Neurological Disorders Drug Targets 13 (8): 1427–31. 2014. doi:10.2174/1871527313666141023145703. PMID 25345508. 
  13. ↑ "β-secretase inhibitor; a promising novel therapeutic drug in Alzheimer's disease". Frontiers in Aging Neuroscience 6: 165. 2014. doi:10.3389/fnagi.2014.00165. PMID 25100992. 
  14. ↑ European Medicines Agency. "Questions and answers on the recommendati on for the refusal of the marketing authorisation for Milnacipran Pierre Fabre Médicament/Impulsor". European Medicines Agency. http://www.ema.europa.eu/docs/en_GB/document_library/Summary_of_opinion_-_Initial_authorisation/human/001034/WC500089875.pdf. 

External links



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