31/05/2025
A MONTH COURSE OF ANTI TUBERCULOSIS DRUGS, SENSITIVITY & RESISTANCE
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Mycobacterium tuberculosis is an aerobic, + ve rod shaped, non motille, non capsulated 2 × 0 2 un have nucleus, cytoplasm envelope cell membrane, cell wall composed of peptidoglycans, arabinoglactan MYCOLIC ACID lipids ,and micosides , acid fast bacillus once stained with hot carbolic fuchsin resist to decolourise by dilute mineral acid or alcohol due presence of mycolic acid lipids
SENSITIVITIES of M .TB to ATT
1 Inhibit cell wall synthesis - vancomycin, cycloserin
2 Inhibit protein synthesis- linezolid
3 Disrupt m RNA codes & affect permeability- strptomycin ,kananycin
4 Inhibit DNA gyrase - Fluoroquinolons
5 Interfere with DNA & RNA functions- Rifampicin ,Rifabutin
6 Interfere with DNA synthesis - Idoxuridine
7 Intertere with intermediary metabolism- para amino salycylic acid ,Ethambutol
8 Inhibit the synthesis of mycolic acid - Isoniazid , Pyrazinamide ,Ethambutol
9 Tuberculocidal and pe*****te tubercular cavities - streptomycin
10 Tuberculostatic - Thiocetazone
11 Most potent drugs - Bedaquilin , Linezolid
Anti TB drugs can be divided into
1 1st line - HRZES - Isoniazid, Rifampicin ,Pyrazinamide, Ethambutol, streptomycin
2 2nd line - cycloserine, kanamycin ,Amikacin , capreomycin ,Fluroquinolones, Delamanid ,Azithro ,clarithro, pa, tan, Etm
Thus suggestive synergistic wise use of ATT may kills Mycobacterium within a month for cat 1 ie.Att 2nd line for 14 days followed by 1st line for 14 days ( complete successful 1 months treatment ) when approved by WHO ie. Killing of M . Tuberculosis's DNA ,PROTEINS ,RNA ,METABOLISM, CELL WALL above described
RESISTANCE ---
Unwise use of ATT soon develop resistance by 1 Mutational changes M Bacterial genome 2 Transmission of resistance steaints 3 with Inadequate treatment ,4 Non compliance 4 poor quality drugs 5 poor