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NCI Drug Dictionary

  

isoniazid 
A synthetic derivative of nicotinic acid with anti-mycobacterial properties. Although its mechanism of action is still unclear, isoniazid appears to block the synthesis of mycolic acids, major components of the mycobacterial cell wall. This agent is only active against actively growing mycobacteria because, as a pro-drug, it requires activation in susceptible mycobacterial species. Isoniazid also interferes with mycobacterial metabolism of vitamin B6. Resistance occurs due to decreased bacterial wall penetration. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)
Abbreviation:INH
Chemical structures:isonicotinic acid hydrazide
isonicotinyl hydrazine