Pizotifen

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Pizotifen
Clinical data
Trade namesSandomigran, Mosegor, Litec, others
Other namesPizotyline; BC-105
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
  • 4-(1-methyl-4-piperidylidine)-9,10-dihydro -4H-benzo-[4,5]cyclohepta[1,2]-thiophene
JSmol)
SMILES
  • s1c3c(cc1)C(\c2c(cccc2)CC3)=C4/CCN(C)CC4
  • InChI=1S/C19H21NS/c1-20-11-8-15(9-12-20)19-16-5-3-2-4-14(16)6-7-18-17(19)10-13-21-18/h2-5,10,13H,6-9,11-12H2,1H3 checkY
  • Key:FIADGNVRKBPQEU-UHFFFAOYSA-N checkY
  (verify)

Pizotifen, also known as pizotyline and sold under the brand names Sandomigran and Mosegor among others, is an

preventative to reduce the frequency of recurrent migraine headaches.[1]

Medical uses

Migraine headaches

The main medical use for pizotifen is for the prevention of

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.

Other uses

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

overdose[8] in a similar manner to the closely related antihistamine/anti-serotonin medication cyproheptadine
.

Pizotifen might be useful as a

overdose.[10]

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.[11]

Pizotifen is contraindicated in patients who suffer from hypersensitivity to any of its components or have gastric outlet obstruction, angle-closure glaucoma, and difficulty urinating.[12] In addition, women who are pregnant should not take pizotifen.[12]

Adverse effects

dry mouth, drowsiness, increased appetite and weight gain.[13]
Occasionally it may cause nausea, headaches, or dizziness. In rare cases, anxiety, aggression and depression may also occur.

Pharmacology

Pharmacodynamics

Pizotifen activities
Target
Affinity
(Ki, nM)		 Species
5-HT1A 200–270 Human
5-HT1B 1415 Human
5-HT1D 770 Human
5-HT1E 820 Human
5-HT2A 2.0 Human
5-HT2B 2.0–2.3 Human
5-HT2C 8.4 Human
5-HT3 95 Human
5-HT4 ND Human
5-HT5A 110 Human
5-HT6 74 Human
5-HT7 17–25 Human
D1
 3.5 Human
D2
 2.4–87 Human
D3
 ND ND
D4
 64 Human
D5
 50 Human
α1A 65 Human
α1B >10000 Human
α2A 660 Human
α2B 225 Human
α2C 390 Human
β1 >10000 Human
β2 >10000 Human
H1
 1.9 Human
H2
 1.4 Human
M1
 67 Human
M2
 34 Human
M3
 29 Human
M4
 130 Human
M5
 6.8 Human
I1 receptor
 121 Human
σ1 receptor >10000 Guinea pig
σ2 receptor 6450 Rat
SERTTooltip Serotonin transporter >10000 Human
NETTooltip Norepinephrine transporter 710 Human
DATTooltip Dopamine transporter >10000 Human
Note: The smaller the value, the more avidly the compound binds to or activates the site. Refs: [14][15][16][10][17]

Pizotifen is a

serotonin, dopamine, adrenergic, histamine, and muscarinic acetylcholine receptors.[10]

Pizotifen is able to

DOM, in drug discrimination tests.[10]

The antimigraine activity of pizotifen might be specifically due to serotonin 5-HT2B receptor blockade.[19]

Chemistry

Pizotifen is a

tricyclic compound and is specifically a benzocycloheptene.[20][21]

Close analogues of pizotifen include ketotifen and cyproheptadine, among others.

History

Pizotifen was first described in the literature by 1964.[20]

Society and culture

Names

Pizotifen is the

INNTooltip International Nonproprietary Name and BANTooltip British Approved Name, while pizotyline is its USANTooltip United States Adopted Name.[20][21][22] Brand names of pizotifen include Sandomigran, Mosegor, and Litec, among others.[20][21][22][23]

Availability

Pizotifen is available widely throughout the world, including in Europe.[21][23]

References

  1. S2CID 10357983
    .
  2. PMID 26172390
    .
  3. PMID 15210509
    .
  4. S2CID 24217802
    .
  5. S2CID 40807034
    .
  6. S2CID 6445059
    .
  7. S2CID 13510725
    .
  8. S2CID 20885754
    .
  9. PMID 37982394
    .
  10. ^
    PMID 16253319
    .
  11. ^ "SANDOMIGRAN® pizotifen 500 micrograms coated tablets" (PDF). AFT Pharmaceuticals Ltd. Medsafe: New Zealand Medicines and Medical Devices Safety. 21 June 2019.
  12. ^ a b "Pizotifen". Universal Reference Book of Medicines – via Likarstwo.ru.
  13. ^ 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.
  14. ^ "PDSP Database". UNC (in Zulu). Retrieved 24 November 2024.
  15. ^ "PDSP Database". UNC (in Zulu). Retrieved 24 November 2024.
  16. ^ Liu T. "BindingDB BDBM82088 CAS_15574-96-6::NSC_27400::PIZOTIFEN". BindingDB. Retrieved 24 November 2024.
  17. PMID 24189186
    .
  18. PMID 411500
    .
  19. PMID 27127104
    .
  20. ^
    ISBN 978-1-4757-2085-3
    . Retrieved 24 November 2024.
  21. ^
    ISBN 978-3-88763-101-7
    . Retrieved 24 November 2024.
  22. ^
    ISBN 978-94-011-4439-1
    . Retrieved 24 November 2024.
  23. ^ a b "Pizotifen (International database)". Drugs.com. 3 November 2024. Retrieved 24 November 2024.