About tinidazolenitroimidazole antibiotic, antibacterial, antiprotozoal.mechanism of action of tinidazoletinidazole is nitro imidazole which has broad spectrum cidal activity against protozoa and some anaerobic bacteria. its selective toxicity to anaerobic microbes involves 1. drug enters the cell by diffusion, 2. nitro group of drug is reduced by redox proteins present only in anaerobic organisms to reactive nitro radical which excerts cytotoxic action by damaging dna and other critical biomolecules. 3. .dna helix destabilization &strand breakage has been observed.indications for tinidazole1.amoebiasis 2.giardiasis 3.trichomonas vaginitis 4.anaerobic bacterial infections 5.prophylactic agent after colorectal surgery 6.h. pylori infections interactions for tinidazolealcohol: disulfiram like reaction. ampicillin, doxycycline and cotrimoxaole: synergism with these agents.