Farmakologik xususiyatlari
Levofloksatsin sintetik antibakterial preparat keng spektrli ta'sirga ega florokinolonlar guruhidan bo'lib, faol modda sifatida levofloksatsin - ofloksatsin izomeri mavjud.
Levofloksatsin DNK-girazani (topoizomeraza II) va topoizomeraza IV ni bloklaydi, superspiralizatsiyani va DNK uzilishlarini tiklashni buzadi, DNK sintezini inhibe qiladi, sitoplazmada, hujayra devorida va membranalarda chuqur morfologik o'zgarishlarni keltirib chiqaradi.
Levofloksatsin quyidagi mikroorganizmlarga nisbatan faol:
Aerob gram ijobiy mikroorganizmlar: Corynebacterium diphtheriae, Enterococcus faecalis, Enterococcus spp, Listeria monocytogenes, Staphylococcus koagulaza-negativ methi-S(1) penitsillinga sezgir (metirillino- o'rtacha sezgir) Staphylococcus aureus methi-S, Staphylococcus epidermidis methi-S. Staphylococcus spp (CNS), Streptococci guruh C va G, Streptococcus agalactiae, Streptococcus pneumoniae pen I/S/R (penitsillinga sezgir/-o'rtacha sezgir qarshilik ko'rsatadigan), Streptococcus pyogenes, Viridans streptococci pen-S/R.
Aerob gram manfiy mikroorganizmlar: Acinetobacter baumannii, Acinetobacter spp, Actinobacillus actinomycetemcomitans, Citrobacter freundii, Eikenella corrodens, Enterobacter aerogenes, Enterobacter agglomerans, Enterobacter cloacae, Enterobacter spp, Escherichia coli, Gardnerella vaginalis, Haemophilus ducreyi, Haemophilus influenzae ampi-S/R (amitsillinga sezgir/-qarshilik ko'rsatadigan), Haemophilus parainfluenzae, Helicobacter pylori, Klebsiella oxytoca, Klebsiella pneumoniae, Klebsiella spp. Moraxella catarrhalis B+B, Morganella morganii, Neisseria gonorrhoeae non PPNG/PPNG, Neisseria meningitidis, Pasteurella conis, Pasteurella dagmcilis, Pasteurella multocida, Pasteurella spp, Proteus mirabilis, Proteus vulgaris, Providencia rettgeri, Providencia stuartii, Providencia spp, Pseudomonas aeruginosa, Pseudomonas spp, Salmonella spp, Serratia marcescens, Serratia spp. Anaerob mikroorganizmlar: Bacteroides fragilis, Bifidobacterium spp, Clostridium perfringens, Fusobacterium spp, Peptostreptococcus, Propionibacterium spp, Veillonella 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, Rickettsia spp. Ureaplasma urealylicum.
O'rtacha faol
Anaerob gram ijobiy mikroorganizmlar: Corynebacterium urealiticum, Corynebacterium xerosis, Enterococcus faecium, Staphylococcus epidermidis methi-R (metitsillinga qarshilik ko'rsatadigan), Staphylococcus haemolyticus methi-R.
Anaerob gram manfiy mikroorganizmlar: Burkholderia cepacia, Campylobacter jejuni/coli
Anaerob mikroorganizmlar: Bacteroides thetaiotaomicron, Bacteroides vulgatus, Bacteroides ovatus, Prevotella spp, Porphyromonas spp,
Preparatga chidamli
Aerob gram ijobiy mikroorganizmlar: Corynebacterium jeikeium, Staphylococcus aureus methi-R, Staphylococcus koagulaza-negativ methi-R.
Anaerob gram manfiy mikroorganizmlar: Alcaligenes xylosoxidans
Boshqa mikroorganizmlar: Mycobacterium avium.
Farmakokinetika
500 mg levofloksatsinning 60 daqiqalik venaga (v/v) infuziyasidan so'ng sog'lom ko'ngilli shaxslarda plasmaning o'rtacha gipsoz konsentratsiyasi 6,2 mkg/ml ni tashkil etdi. Levofloksatsinning farmakokinetikasi chiziqli xarakterga ega va preparatni bir martalik va ko'p martalik kiritishda bashorat qilinadi. Levofloksatsinning plasma konsentratsiyalari v/v kiritilgandan keyin tabletkalar qabul qilinganida shunga o'xshashdir. Shuning uchun, og'zaki va v/v kiritish yo'llari o'zaro almashtirilishi mumkin.
500 mg levofloksatsin v/v bir martalik qabul qilinganidan keyin farmakokinetik xususiyatlar mos ravishda quyidagilarni tashkil etadi: maksimal konsentratsiya (Cmax) 6,2±1,0 mkg/ml, maksimal konsentratsiyaga erishish vaqti (Tmax) 1,0±0,1 soat, yarim chiqarilish davri (t1/2) 6,4±0,7 soat.
Levofloksatsin asosan o'zgarmagan holda siydik bilan chiqariladi. Levofloksatsinning o'rtacha oxirgi T1/2 bir martalik va ko'p martalik kiritishdan keyin 6 dan 8 soatgacha davom etadi. Buyrak yetishmovchiligi holatida preparatning klirensining kamayishi
va uning buyraklar orqali chiqarilishi kreatinin klirensining pasayish darajasiga bog'liq.