Chemical Component Summary

Identifiers4-amino-2-hydroxy-benzoic acid
FormulaC7 H7 N O3
Molecular Weight153.13
Isomeric SMILESNc1ccc(C(O)=O)c(O)c1

Chemical Details

Formal Charge0
Atom Count18
Chiral Atom Count0
Chiral Atomsn/a
Bond Count18
Aromatic Bond Count6
Leaving Atomsn/a

Drug Info: DrugBank

DrugBank IDDB00233 Different stereochemistry
NameAminosalicylic Acid
DescriptionAn antitubercular agent often administered in association with isoniazid. The sodium salt of the drug is better tolerated than the free acid. [PubChem]
  • 4-amino-2-hydroxybenzoic acid
  • 4-aminosalicylate
  • 4-aminosalicylic acid
  • p-aminosalicylic acid
  • para-amino salicylic acid
  • Aminosalicylate calcium
  • Aminosalicylate sodium
  • Calcium aminosalicylate trihydrate
  • Sodium aminosalicylate dihydrate
Brand Names
  • Nemasol Sodium Tab 500mg
  • Paser
  • Pamisyl
  • Rexipas
  • Rezipas
Affected OrganismMycobacteria
IndicationFor the treatment of tuberculosis
PharmacologyAminosalicylic acid is an anti-mycobacterial agent used with other anti-tuberculosis drugs (most often isoniazid) for the treatment of all forms of active tuberculosis due to susceptible strains of tubercle bacilli. The two major considerations in the clinical pharmacology of aminosalicylic acid are the prompt production of a toxic inactive metabolite under acid conditions and the short serum half life of one hour for the free drug. Aminosalicylic acid is bacteriostatic against <i>Mycobacterium tuberculosis</i> (prevents the multiplying of bacteria without destroying them). It also inhibits the onset of bacterial resistance to streptomycin and isoniazid.
Mechanism of actionThere are two mechanisms responsible for aminosalicylic acid's bacteriostatic action against <i>Mycobacterium tuberculosis</i>. Firstly, aminosalicylic acid inhibits folic acid synthesis (without potentiation with antifolic compounds). The binding of para-aminobenzoic acid to pteridine synthetase acts as the first step in folic acid synthesis. Aminosalicylic acid binds pteridine synthetase with greater affinity than para-aminobenzoic acid, effectively inhibiting the synthesis of folic acid. As bacteria are unable to use external sources of folic acid, cell growth and multiplication slows. Secondly, aminosalicylic acid may inhibit the synthesis of the cell wall component, mycobactin, thus reducing iron uptake by <i>M. tuberculosis</i>.
Route of administrationOral
  • Acids, Carbocyclic
  • Aminobenzoates
  • Aminosalicylic Acid and Derivatives
  • Aminosalicylic Acids
  • Anti-Bacterial Agents
  • J04AA02
  • J04AA01
  • J04AA03
CAS number65-49-6
Drug Info/Drug Targets: DrugBank 3.0: a comprehensive resource for 'omics' research on drugs. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS. Nucleic Acids Res. 2011 Jan; 39 (Database issue):D1035-41. | PMID:21059682