Chemistry:Pizotifen

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Short description: Drug used to reduce frequency of headaches
Pizotifen
Pizotifen structure.svg
Clinical data
Trade namesSandomigran
AHFS/Drugs.comInternational Drug Names
Pregnancy
category
  • AU: B1
Routes of
administration		Oral
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability78%
Protein binding91%
MetabolismGlucuronidation (main route). N-glucuronide accounts for >50% of plasma and 60–70% of urinary excreted drug
Elimination half-life23 hours
Excretion18% feces, 55% urine (both as metabolites)
Identifiers
CAS Number
PubChem CID
IUPHAR/BPS
ChemSpider
UNII
KEGG
ChEMBL
Chemical and physical data
FormulaC19H21NS
Molar mass295.44 g·mol−1
3D model (JSmol)
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Pizotifen (INN) or pizotyline (USAN), trade name Sandomigran, is a benzocycloheptene-based drug used as a medicine, primarily as a preventive to reduce the frequency of recurrent migraine headaches.[1]

Uses

The main medical use for pizotifen is for the prevention of migraine and cluster headache. Pizotifen is one of a range of medications used for this purpose, other options include propranolol, topiramate, valproic acid, cyproheptadine and amitriptyline. While pizotifen is effective in adults,[2] evidence of efficacy in children is limited,[3] and its use is limited by side effects, principally drowsiness and weight gain, and it is usually not the first choice medicine for preventing migraines, instead being used as an alternative when other drugs have failed to be effective.[4] It is not effective in relieving migraine attacks once in progress. Pizotifen has also been reported as highly effective in a severe case of erythromelalgia, a rare neurovascular disease that is sometimes refractory to the other drugs named above.[5]

Other applications for which pizotifen may be used include as an antidepressant, or for the treatment of anxiety or social phobia.[6][7] Animal studies also suggest that pizotyline could be used in the treatment of serotonin syndrome or MDMA overdose[8] in a similar manner to the closely related antihistamine/antiserotonin medication cyproheptadine.

Adverse effects

Side effects include sedation, dry mouth, drowsiness, increased appetite and weight gain.[9] Occasionally it may cause nausea, headaches, or dizziness. In rare cases, anxiety, aggression and depression may also occur.

Contraindications

Caution is required in patients having closed angle glaucoma and in patients with a predisposition to urinary retention as the medication exhibits a relatively small anticholinergic effect. Dose adjustment is required in people who have chronic kidney disease. Liver injury has also been reported. Pizotifen treatment should be discontinued if there is any clinical evidence of liver dysfunction during treatment. Caution is advised in patients having a history of epilepsy. Withdrawal symptoms like depression, tremor, nausea, anxiety, malaise, dizziness, sleep disorder and weight decrease have been reported following abrupt cessation of pizotifen.[10] Pizotifen is contraindicated in patients who suffer from hypersensitivity to any of its components, also Pizotifen is contraindicated in gastric outlet obstruction, pregnancy, angle-closure glaucoma and difficulty urinating.[11]

Pharmacology

Pizotifen is a serotonin antagonist acting mainly at the 5-HT2A and 5HT2C receptors. It also has some activity as an antihistamine as well as some anticholinergic activity.[12]

See also

References

  1. ↑ "Management of migraine in Australian general practice". The Medical Journal of Australia 187 (3): 142–146. August 2007. doi:10.5694/j.1326-5377.2007.tb01170.x. PMID 17680738. 
  2. ↑ "A Comparative Effectiveness Meta-Analysis of Drugs for the Prophylaxis of Migraine Headache". PLOS ONE 10 (7): e0130733. 2015-07-14. doi:10.1371/journal.pone.0130733. PMID 26172390. Bibcode: 2015PLoSO..1030733J. 
  3. ↑ "Do pizotifen or propranolol reduce the frequency of migraine headache?". Archives of Disease in Childhood 89 (7): 684–685. July 2004. doi:10.1136/adc.2004.054668. PMID 15210509. 
  4. ↑ "Which therapy for which patient?". Neurological Sciences 27 (Suppl 2): S153–S158. May 2006. doi:10.1007/s10072-006-0592-0. PMID 16688621. 
  5. ↑ "Erythromelalgia: new theories and new therapies". Journal of the American Academy of Dermatology 43 (5 Pt 1): 841–847. November 2000. doi:10.1067/mjd.2000.109301. PMID 11050591. 
  6. ↑ "Pizotifen as an antidepressant". Acta Psychiatrica Scandinavica 56 (4): 276–279. October 1977. doi:10.1111/j.1600-0447.1977.tb00228.x. PMID 335788. 
  7. ↑ "Clinical observations with pizotifene (Sandomigran) in the treatment of nonmigrainous depressed women". Archiv für Psychiatrie und Nervenkrankheiten 225 (1): 67–72. March 1978. doi:10.1007/bf00367352. PMID 348154. 
  8. ↑ "Pizotyline effectively attenuates the stimulus effects of N-methyl-3,4-methylenedioxyamphetamine (MDMA)". Pharmacology, Biochemistry, and Behavior 82 (2): 404–410. October 2005. doi:10.1016/j.pbb.2005.09.010. PMID 16253319. 
  9. ↑ Crowder D, Maclay WP. Pizotifen once daily in the prophylaxis of migraine: results of a multi-centre general practice study. Current Medical Research and Opinion. 1984;9(4):280-5.
  10. ↑ "SANDOMIGRAN® pizotifen 500 micrograms coated tablets". AFT Pharmaceuticals Ltd. Medsafe: New Zealand Medicines and Medical Devices Safety. 21 June 2019. https://www.medsafe.govt.nz/profs/datasheet/s/Sandomigrantab.pdf. 
  11. ↑ "Pizotifen". Universal reference book of medicines. http://lekarstwo.ru/en/preparati/pizotifen.html. 
  12. ↑ "Pharmacological properties of 4(1-methyl-4-piperidylidine)-9,10-dihydro-4H-benzo-[4,5]cyclohepta[1,2]-thiophene hydrogen maleate (pizotifen)". Arzneimittel-Forschung 27 (10): 1968–1979. 1977. PMID 411500. 

External links



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