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Clinical data
Trade names Eadazine, Kelfizina, Kelfizine W, Longum
AHFS/ International Drug Names
Routes of
ATC code J01ED02 (WHO) QJ01EQ19 (WHO)
Pharmacokinetic data
Protein binding 60 to 80%[1]
Biological half-life 60 to 65 hours[1]
Excretion Urinary[1]
Synonyms Sulfametopyrazine
CAS Number 152-47-6 YesY
PubChem (CID) 9047
DrugBank DB00664 YesY
ChemSpider 8695 YesY
KEGG D01216 YesY
ECHA InfoCard 100.005.278
Chemical and physical data
Formula C11H12N4O3S
Molar mass 280.304 g/mol
3D model (Jmol) Interactive image

Sulfalene (INN, USAN) or sulfametopyrazine (BAN) is a long-acting sulfonamide antibacterial used for the treatment of chronic bronchitis, urinary tract infections and malaria.[2][3] As of 2014 there were only two countries in which it is currently still marketed: Thailand and Ireland.[3]

It was discovered by researchers at Farmitalia and first published in 1960 and was marketed as Kelfizina.[4][5]

See also[edit]


  1. ^ a b c d "Sulfalene". MIMS Drug Information System. Retrieved 26 August 2011. 
  2. ^ DrugBank DB00664
  3. ^ a b Brayfield, A, ed. (9 May 2013). "Sulfametopyrazine". Martindale: The Complete Drug Reference. Pharmaceutical Press. Retrieved 28 March 2014. 
  4. ^ Baruffa G. Clinical trials in Plasmodium falciparum malaria with a long-acting sulphonamide. Trans R Soc Trop Med Hyg. 1966;60(2):222-4. PMID 5332105
  5. ^ Per prior citation, the first publication: Camerino B, Palamidessi G (1960) Derivati della parazina II. Sulfonamdopir (in Italian). Gazz Chim Ital 90:1802–1815