Farmakologik xususiyatlari
Levofloksatsin – florokinolon, keng spektrli bakteritsid vosita. Ta'sir mexanizmi bakterial topoizomeraza IV va DNK-giraza (topoizomeraza II) - bakterial DNK replikatsiyasi, transkriptsiyasi, tiklanishi va rekombinatsiyasi uchun zarur bo'lgan fermentlarni inhibe qilishda yotadi. Antimikrob faoliyati In vitro levofloksatsin gram ijobiy va gram salbiy mikroorganizmlarga nisbatan keng antimikrob faoliyatini namoyish etadi. Levofloksatsin va boshqa florokinolonlar o'rtasida kesishgan qarshilik kuzatiladi, lekin boshqa florokinolonlarga qarshi chidamli bo'lgan ba'zi mikroorganizmlar levofloksatsinga sezgir. Levofloksatsin ko'p mikroorganizmlar shtammlariga nisbatan faol, in vivo va in vitro sharoitlarda. In vitro Sezgir mikroorganizmlar (MPC <2 mg/l, inhibisiya zonasi >17 mm) - Aerob gram ijobiy mikroorganizmlar Corynebacterium diphtheriae, Corynebacterium striatum, Enterococcus faecalis, Enterococcus spp, Listeria monocytogenes, Staphylococcus koagulyaza-salbiy methi-S(I) [metitsillino-sezgir/-o'rtacha sezgir], Staphylococcus aureus methi-S, Staphylococcus epidermidis methi-S Staphylococcus spp, Streptokoklar C va G guruhlari, Streptococcus agalactiae, Streptococcus pneumonia peni I/S/R (penitsillino-sezgir/-o'rtacha sezgir/-qarshilik ko'rsatuvchi), Streptococcus pyogenes, Viridans streptokoklari peni-S/R. - Aerob gram salbiy mikroorganizmlar Acinetobacter baumannii, Acinetobacter spp, Acinetobacillus actinomycetemcomitans, Citrobacter freundii, Eikenella corrodens, Enterobacter aerogenes, Enterobacter agglomerans, Enterobacter cloacae, Enterobacter spp, Escherichia coli, Gardnerella vaginalis, Haemophilus ducreyi, Haemophilus influеnzае ampi-S/R (ampitsillino-sezgir/-qarshilik ko'rsatuvchi), Haemophilus parainfluenzae, Helicobacter pylori, Klebsiella oxytoca, Klebsiella pneumoniae, Klebsiella spp, Moraxella catarrhalis β+/-β-, Morganella morganii, Neisseria gonorrhoeae, Neisseria meningitidis, Pasteurella canis, Pasteurella dagmatis, Pasteurella multocida, Pasteurella spp, Proteus mirabilis, Proteus vulgaris, Providencia rettgeri, Providencia stuartii, Providencia spp, Pseudomonas aeruginosa (Pseudomonas aeruginosa sabab bo'lgan shifoxona infeksiyalari kombinatsiyalangan davolashni talab qilishi mumkin), Pseudomonas spp, Salmonella spp, Serratia marcescens, Serratia spp. - Anaerob mikroorganizmlar Bacteroides fragilis, Bifidibacterium spp, Clostridium perfringens, Fusobacterium spp, Peptostreptococcus, Propionibacterium spp, Veilonella spp. - Boshqa mikroorganizmlar Bartonella spp, Chlamydia pneumoniae, Chlamydia psittaci, Chlamydia trachomatis, Legionella pneumophila, Legionella spp, Mycobacterium spp., Mycobacterium leprae, Mycobacterium tuberculosis, Mycoplasma hominis, Mycoplasma pneumoniae, Ricketsia spp, Ureaplasma urealyticum. O'rtacha sezgir mikroorganizmlar (MPC =4 mg/l, inhibisiya zonasi 16-14 mm) - Aerob gram ijobiy mikroorganizmlar Corynebacterium urealyticum, Corynebacterium xerosis, Enterococcus faecium, Staphylococcus epidermidis methi-R (metitsillino-qarshilik ko'rsatuvchi), Staphylococcus haemolyticus methi-R. - Aerob gram salbiy mikroorganizmlar Burkholderia cepacia, Campylobacter jejuni/coli. - Anaerob mikroorganizmlar Bacteroides thetaiotaomicron, Bacteroides vulgatus, Bacteroides ovatus, Prevotella spp, Porphyromonas spp. Levofloksatsinga chidamli mikroorganizmlar (MPC >8 mg/l, inhibisiya zonasi <13 mm) - Aerob gram ijobiy mikroorganizmlar Corynebacterium jeikeium, Staphylococcus aureus methi-R, Staphylococcus koagulyaza-salbiy methi-R. - Aerob gram salbiy mikroorganizmlar Alcaligenes xylosoxidans. - Anaerob mikroorganizmlar Bacteroides thetaiotaomicron. - Boshqa mikroorganizmlar Mycobacterium avium. Klinik samaradorlik (quyida keltirilgan mikroorganizmlar sabab bo'lgan infeksiyalarni davolashda klinik tadqiqotlarda samaradorlik) - Aerob gram ijobiy mikroorganizmlar Enterococcus faecalis, Staphylococcus aureus, Streptococcus pneumoniae, Streptococcus pyogenes. - Aerob gram salbiy mikroorganizmlar Citrobacter freundii, Enterobacter cloacae, Escherichia coli, Haemophilus influеnzае, Haemophilus parainfluenzae, Klebsiella pneumoniae, Moraxella (Branhamella) catarrhalis, Morganella morganii, Proteus mirabilis, Serratia marcescens. - Boshqa mikroorganizmlar Chlamydia pneumoniae, Legionella pneumophila, Mycoplasma pneumoniae. Levofloksatsin ta'sir mexanizmining xususiyatlari tufayli odatda levofloksatsin va boshqa antimikrob vositalar o'rtasida kesishgan qarshilik kuzatilmaydi. Farmakokinetika Levofloksatsin ichga qabul qilinganda tez va deyarli to'liq so'riladi. Plazmadagi maksimal konsentratsiya ichga qabul qilinganidan 1-2 soat o'tgach erishiladi va 5,2±1,2 mcg/ml ni tashkil etadi. Levofloksatsinning biofaolligi - taxminan 99%. Preparat ovqat iste'mol qilishdan qat'i nazar qo'llanilishi mumkin. Tana to'qimalariga va suyuqliklariga yaxshi kiradi. Levofloksatsinning o'pkadagi to'qimalardagi konsentratsiyasi (maksimal konsentratsiya taxminan 11,3 mcg/ml va 4-5 soatdan keyin erishiladi) qon plazmasidagi konsentratsiyadan 2-5 baravar yuqoridir. 24-38% preparat plazma oqsillari bilan bog'lanadi. Tana ichida preparat qisman metabolizatsiyaga uchraydi. Asosan o'zgarmagan holda buyraklar orqali chiqariladi (taxminan 87%) va 5% - 48 soat ichida nofaol metabolitlar shaklida. 72 soat ichida ichak orqali 4% dan kam chiqariladi. Yarim chiqarilish davri 6 dan 8 soatgacha o'zgaradi.