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] This systemic antibiotic-related article is a stub.

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