A bacteriostatic agent against tubercle bacilli, used as a second-line agent; potassium, sodium, and calcium salts have the same use.
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p-ami·no·sal·i·cyl·ic ac·id (PAS) (PASA) (ə-me″no-sal-ĭ-silґik) an analogue of p-aminobenzoic acid (PABA) that inhibits folic acid synthesis in Mycobacterium tuberculosis and is bacteriostatic, inhibiting growth and multiplication of the tubercle bacillus; available as aminosalicylic acid [USP].Medical dictionary. 2011.