Download - Aminoglycoside Antibiotics Prof. R. K. Dixit Pharmacology and Therapeutics K. G. M. U. Lucknow
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Aminoglycoside Aminoglycoside AntibioticsAntibioticsProf. R. K. Dixit
Pharmacology and Therapeutics
K. G. M. U. Lucknow
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First member Streptomycin discovered by Waksman in 1944
Natural and semi-synthetic antibiotics
Produced from ActinomycetesThose obtained from Streptomyces – Have suffix mycinmycin (eg. Streptomycin)
Those obtained from Micromonospora – Have suffix
micinmicin (eg. Gentamicin,)
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Structure characterized by Two aminosugars joined to One aminocyclitol moiety by Glycosidic (-O-) bond
In most of members aminoacyclitol moiety is 2-Deoxystreptamine .
In streptomycin the aminocyclitol is Streptidine.
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General character of General character of Aminoglycosides groupAminoglycosides groupFormulations are Sulfate or
hydrochloric saltsFormulations are water soluble and
stableHighly polar basic drugs. Ionize during dissolutionDistribution inside the cells is minimalPenetration through BBB is minimalLeast metabolized by hepatic enzymesExcretion is mainly renal (unchanged form,
through glomerular filtration)
(Not absorbed from GIT)(Not absorbed from GIT)
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Bactericidal in natureMore active in alkaline pHMOA is by interfering with protein
synthesisAttach with 30S ribosomal subunit (ATT) Concentration dependent (PAE)Mainly gram negative (plus tuberculosis by
streptomycin, Kanamycin, Amikacin)Cross resistance is partialTherapeutic index is narrow
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Have NONE side effects NephrotoxicOtotoxicNeuromuscular blockage
Etc.(Teratogenicity)
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NephrotoxicityNephrotoxicityStreptomycin is least nephrotoxic.Larger the number of NH2 more nephrotoxicity.Nephrotoxicity is caused by
Inhibition of an intracellular lysosomal phospholipase-A2 in renal brush border.
Leading to lysosomal distension, Rupture and Release of acid hydrolases Release of Free Aminoglycosides into cytosol. This free drug binds to other cellular organelles (eg. In
mitochondria it displaces Ca++ leading to mitochondrial degeneration and necrosis.)
Nephrotoxicity is reversibleVerapamil and Ca++ can
Reduce nephrotoxic potential ButAlso reduce antibacterial effect
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KAN (Kanamycin, Amikacin, Neomycin) mainly damage cochlea rest vestibular damage
All are teratogenic
Neomycin and Framycetin have extreme systemic toxicity ( only topically used)
Amikacin has widest spectrum
Avoid concurrent use of other Ototoxic drugs ( Frusemide, Ethacrinic acid, Minocycline)
Neomycin used orally for Hepatic Encephalopathy)Hepatic Encephalopathy)
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Avoid concurrent use of other nephrotoxic drugs (Amphotericin B, Vancomycin, Cephalothin, Cephradrine, Cyclosporin, Cisplatin)
Be overcautious while using in extremes of age and renal compromised
Be overcautious while using in operated patients (Received Curare)
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Don’t mix with any other drug (Pharmaceutical Drug Interaction)
Partially removed by peritoneal and haemodialysis
The excretion is proportional to creatinine clearance.
Half life increases in renal insufficiency.Dose adjustment is needed in renal insufficiencyMost precise method for calculating dose is using
creatinine clearanceBut in Practice most often used formula to
calculate dose is
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MembersMembersAmikacinStreptomycinSisomicinSpectinomycinKanamycinIspepamycinNetilmicinGentamicinTobramycin
ASKING Truth IS Great TASK
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MOAMOABactericidal (Gram Negative, No action on
Anaerobes)Initial entry of Aminoglycosides through
bacterial cell wall to periplasmic space Through porin channels by passive diffusion (1)
Later on further Entry across cytoplasmic membrane is carrier mediated (linked to (linked to electron transport chain, energy and oxygen electron transport chain, energy and oxygen dependent)dependent)Active transport (2)Active transport (2)
Advantage of adding Beta lactamsBeta Lactam antibiotics weaken the bacterial cell
wall Facilitate passive diffusion of Aminoglycoside.
(Synergism)
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Penetration is dependent onMaintenance of polarized membraneOxygen dependent active process
Not active in absence of oxygenNot effective against anaerobesNot effective in presence of big abscess
pH alteration. Alkalization favors penetration into cell
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Prevent polysome formation (accumulation of nonfunctional monosomes)
Inside the bacterial cell Aminoglycoside
bind with 30S ribosome subunit ( or at the interface of 30S and 50S)
Inhibit formation of initiation complexInhibit protein synthesisMisreading of mRNA CodonEntry of wrong amino acid in the chainFormation of wrong peptide chain
(Check the growth of bacteria, Bacteriostatic)
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How Cidal action is achievedAns- Defective proteins incorporated in cell
membrane.Due to secondary changes in the integrity
of bacterial cell membrane. (Increase permeability for ions, amino acids, proteins- Leading to leaking of these out side)
Bonus of incorporation of defective protein in cell membrane
More entry of antibiotic occurs in to the cell. Further increasing affectivityDeath Of
Bacteria
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Resistance developmentResistance development (Conjugation and transfer of plasmid) (Conjugation and transfer of plasmid)
Development and synthesis of plasmid mediated bacterial transferase enzyme (Acetyltransferase, Phosphotransferase, Adenylyltransferase), which inactivates Aminoglycosides.
Impermeability of porins, Impaired active transport
Inactivating enzymes in the cell membrane – Phosphorylate / Adenylate / Acetylate and inactivate Aminoglycosides
Phosphorylated / Adenylated / Acetylated conjugates of Aminoglycoside can not bind at target ribosomal subunit and site.
Decreased affinity of ribosomal proteins for binding with Aminoglycosides
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Side effects and ToxicitySide effects and ToxicityOtotoxic- Ototoxic-
◦ Concentrated in labyrinthine fluid◦ Released from there when plasma concentration decreases.
Less seen in routine dose. (High dose, long time high chance) Damage of sensory and hair cells Vestibular-
◦ Presents with Vertigo, Ataxia, Nystagmus◦ (Headache, Nausea, Vomiting, Dizziness) ◦ Recover slowly ( Least recovery in elderly)
Cochlear- ◦ Starts from base spreads to apex. ◦ High frequency affected first ◦ Recovery is very poor. ◦ Deafness may be permanent, more in elderly◦ Presents with tinnitus (reversible) followed by hearing loss
(irreversible)
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Nephrotoxicity- More damage of cortical nephronsRelated to total exposureMore in ElderlyMore in pre-existing renal diseaseReversibleTubular damage (Loss of concentrating
mechanism)Reduction in GFR (Interference with the
prostaglandin production in kidney)Urine contains albumin and castsNitrogen retention in body
Nephrotoxicity- Reduced clearance of Aminoglycosides – High blood levels of Aminoglycosides – High chances of Ototoxicity
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Neuromuscular BlockadeMore with Neomycin and Streptomycin
Reduce Acetylcholine release from Motor Endings Interfere with mobilization of synaptic vesicles By antagonizing calciumDecreased sensitivity of the muscle end plates to Ach.
Non significant in otherwise normal cases in routine
Dangerous in Myasthenia gravis Direct administration of Aminoglycosides into pleural and
peritoneal cavities If patient received curare like muscle relaxant during
surgical procedure
Partially antagonized by IV calciumPartially antagonized by IV calcium
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StreptomycinStreptomycinNarrow spectrum (Gram negative + M. tuberculosis)Uses
Tuberculosis (First drug to show antitubercular activity)
(PESRI-25,20,15,10,5 mg/kg)Acts against extracellular bacilli (due to poor penetration in the
cell)
Also active against Atypical Mycobacterium (M. kansasii and M. avium intracellulare.)
Resistance develops fast (Never use streptomycin alone as antitubercular)
SABEPlague – (Streptomycin {Tetracycline}Tularemia- (DOC {Tetracyclines alternate}Brucellosis
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Tularemia (rabbit fever, deer fly fever, and Ohara's fever)is caused by the bacterium Francisella tularensis a gram-negative, nonmotile coccobacillus.
Depending on the site of infection, tularemia has six characteristic clinical symptoms: ulceroglandular , glandular, oropharyngeal, pneumonic, oculoglandular, and typhoidal.
Brucellosis, also called Bang's disease, Crimean fever, Gibraltar fever, Malta fever, Mediterranean fever, rock fever, or undulant fever is a highly contagious zoonosis caused by ingestion of unsterilized milk or meat . Transmission from human to human, through sexual contact or from mother to child, is rare but possible.
Brucella are small, gram-negative, non-motile, non-spore-forming, rod shaped (coccobacilli) bacteria. They function as facultative intracellular parasites .
Plague is a deadly infectious disease that is caused by the enterobacteria Yersinia pestis. The symptoms of plague depend on the concentrated areas of infection in each person: such asbubonic plague in lymph nodes, septicemic plague in blood vessels, pneumonic plague in lungs, and so on. It is treatable if detected early.
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Pyrazinamide (25)– Cidal, Intra, Inhibition of Mycolic Acid, Hyperuricemia, Hepatotoxicity
Ethambutol (20)– Static, Inhibits arabinosyl transferase and inhibit Mycolic acid incorporation, Hyperuricemia, Optic Neuritis
Streptomycin (15)- NONE
Rifampicin (10)- Red discoloration, Cidal, Both Extra and Intra, Inhibition of DNA dependent RNA polymerase, Inducer, Hepatitis
Isoniazid (5)- Peripheral neuropathy , Pyridoxine, Inhibition of Mycolic Acid of cell wall, Cidal to multiplying, Both Extra and Intra
ATTATT
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Gentamicin (Gentamicin)Gentamicin (Gentamicin)Most commonly used Aminoglycosides (Jantamycin)
Obtained from Micromonospora purpureaBroader spectrum ( But not effective in T.B)Synergism with Beta lactamsActivity decreases in presence of pusUses -Usually in combination with Penicillin,
Cephalosporin or Fluoroquinolones, (BA, CA, FA with or without M)
SABEUsually
in peritoneal dialysate in topical creams for dressing and eye preparationscombined with Ticarcillin for Pseudomonas
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Gentamicin-PMMA (Polymethyl methacrylate) A new drug delivery system for Osteomyelitis. Small acrylic beads impregnated with gentamicin. Threaded over surgical wire and implanted in bone cavity Left for 10days. Then removed along with wire.
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AmikacinAmikacinSemisynthetic derivative of
KanamycinNext to gentamicin regarding useResistant is lessWidest spectrum ( Second line
ATT)Reserve drug as alternate to
GentamicinMore hearing loss
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KanamycinKanamycinHighly OtotoxicHighly Nephrotoxic)Narrow spectrumRarely used now ( Second line anti-( Second line anti-
tubercular drug)tubercular drug)
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TobramycinTobramycinMore active against
Pseudomonas and ProteusReserve alternative of
Gentamicin
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Sisomicin (Not Sisomycin)Sisomicin (Not Sisomycin)Obtained from Micromonospora
Same as gentamicinGreater efficacy against Pseudomonas
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Netilmicin (Not Netilmicin (Not Netilmycin)Netilmycin)
Semisynthetic derivative of Sisomicin
Similar to Gentamicin but wider spectrum
Effective in Gentamicin resistant cases of Proteus, Pseudomonas, Klebsiella, E.coli
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ParomomycinParomomycinTo treat intestinal amoebiasisCryptosporidiosis in
immunocompromised (AIDS patients)
SpectinomycinSpectinomycinChlamydial treatment along with
Doxycycline
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Framycetin (Soframycin)Framycetin (Soframycin)Too toxic for systemic use Topically as ointment, cream, eye
drops, etc.
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NeomycinNeomycinWide spectrumHighly Cochlear Toxic, and Nephrotoxic
Most common use is topical, ointment, eye and ear drops ◦( in combination with Polymyxin, Bacitracin as Nebasulf, Polybiotic cream, etc)
Neomycin with Polymyxin-B solution is used as an irrigant in urinary bladder to prevent bacteriuria associated with use of indwelling catheter.
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Oral neomycin has damaging effect on intestinal villi- Malabsorption syndrome. Damages colonic flora- deficiency of vit. KSuperinfection
Not used systemically ( Except for preparation of
bowel for surgery and in Hepatic Coma or Hepatic Coma or Hepatic EncephalopathyHepatic Encephalopathy)
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Hepatic coma (Hepatic Hepatic coma (Hepatic Encephalopathy)Encephalopathy)Colonic bacteria produce NH3.NH3 can cross BBBNH3 is toxic to nervous systemNH3 is converted to Urea by Liver (Urea does not cross
BBB) In hepatic failure conversion of NH3 to Urea does not occur Increased level of NH3 produces encephalopathy.Neomycin suppresses colonic floraNH3 production in colon is reducedNH3 level in blood is reduced
Other drug used for this purpose is LactuloseLactulose
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