Mequitazine

Last updated
Mequitazine
Mequitazine structure.svg
Clinical data
Trade names Primalan
AHFS/Drugs.com International Drug Names
ATC code
Legal status
Legal status
  • EU:Rx-only [1]
Identifiers
  • 10-(1-Azabicyclo[2.2.2]octan-3-ylmethyl)phenothiazine
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
CompTox Dashboard (EPA)
ECHA InfoCard 100.045.005 OOjs UI icon edit-ltr-progressive.svg
Chemical and physical data
Formula C20H22N2S
Molar mass 322.47 g·mol−1
3D model (JSmol)
  • c1ccc2c(c1)Sc1ccccc1N2CC1CN2CCC1CC2
  • InChI=1S/C20H22N2S/c1-3-7-19-17(5-1)22(18-6-2-4-8-20(18)23-19)14-16-13-21-11-9-15(16)10-12-21/h1-8,15-16H,9-14H2
  • Key:HOKDBMAJZXIPGC-UHFFFAOYSA-N
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Mequitazine (trade name Primalan) is an H1 antagonist and anticholinergic of the phenothiazine chemical class. It is used to treat allergies and rhinitis.

Contents

It was patented in 1969 and came into medical use in 1976. [2]

Contraindications

Severe liver disease; premature infants or full-term neonates.

Special precautions

Pregnancy, lactation; severe cardiovascular disorders; asthma; angle-closure glaucoma, urinary retention, prostatic hyperplasia, pyloroduodenal obstruction; renal and hepatic impairment; elderly, children; epilepsy. May impair ability to drive or operate machinery.

Adverse reactions

CNS depression including slight drowsiness to deep sleep, lassitude, dizziness, incoordination. Headache, psychomotor impairment and antimuscarinic effects. Rarely, rashes and hypersensitivity reactions, blood disorders, convulsions, sweating, myalgia, paraesthesias, extrapyramidal effects, tremor, confusion, sleep and GI disturbances, tinnitus, hypotension, hair loss. Photosensitivity, jaundice.

Drug interactions

Enhances effects of CNS depressants e.g. alcohol, barbiturates, hypnotics, opioid analgesics, anxiolytics and antipsychotics. Can mask signs of ototoxicity caused by aminoglycosides. QT prolongation (which can lead to torsades de pointes arrhythmia) reported with spiramycin.

Synthesis

Same precursor as for Quifenadine. Note that the synthesis has changed over the years from the original. One route seems to involve a Johnson–Corey–Chaykovsky reaction of the starting ketone, although another secondary route is also discussed.

Thieme Prec: Synthesis: Mequitazine synthesis.svg
Thieme Prec: Synthesis:

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References

  1. "Active substance: mequitazine" (PDF). List of nationally authorised medicinal products. Amsterdam: European Medicines Agency. 15 October 2020.
  2. Fischer J, Ganellin CR (2006). Analogue-based Drug Discovery. John Wiley & Sons. p. 548. ISBN   9783527607495.
  3. US 4546185,Bondiou JC, Hodac F, Legroux D,issued Pharmuka Laboratoires
  4. Gonnot V, Nicolas M, Mioskowski C, Baati R (November 2009). "Expedient synthesis of mequitazine an antihistaminic drug by palladium catalyzed allylic alkylation of sodium phenothiazinate". Chemical & Pharmaceutical Bulletin. 57 (11): 1300–2. doi: 10.1248/cpb.57.1300 . PMID   19881287.
  5. Guminski Y, Fabre V, Lesimple P, Imbert T (June 1999). "An efficient synthesis of mequitazine". Organic Preparations and Procedures International. 31 (3): 319–323. doi:10.1080/00304949909458326.
  6. Leroux S, Larquetoux L, Nicolas M, Doris E (July 2011). "Asymmetric synthesis of (+)-mequitazine from quinine". Organic Letters. 13 (13): 3549–51. doi:10.1021/ol2012567. PMID   21657243.

Further reading