A liposome inhalation suspension is also available and approved to treat Mycobacterium avium complex (MAC) in the United States,[20][5] and in the European Union.[6]
The safety and efficacy of amikacin liposome inhalation suspension, an inhaled treatment taken through a nebulizer, was demonstrated in a randomized, controlled clinical trial where patients were assigned to one of two treatment groups.[20] One group of patients received amikacin liposome inhalation suspension plus a background multi-drug antibacterial regimen, while the other treatment group received a background multi-drug antibacterial regimen alone.[20] By the sixth month of treatment, 29 percent of patients treated with amikacin liposome inhalation suspension had no growth of mycobacteria in their sputum cultures for three consecutive months compared to 9 percent of patients who were not treated with amikacin liposome inhalation suspension.[20]
Special populations
Amikacin should be used in smaller doses in the elderly, who often have age-related decreases in kidney function, and children, whose kidneys are not fully developed yet. It is considered pregnancy category D in both the United States and Australia, meaning they have a probability of harming the fetus.[9] Around 16% of amikacin crosses the placenta; while the half-life of amikacin in the mother is 2 hours, it is 3.7 hours in the fetus.[14] A pregnant woman taking amikacin with another aminoglycoside has a possibility of causing congenital deafness in her child. While it is known to cross the placenta, amikacin is only partially secreted in breast milk.[9]
In general, amikacin should be avoided in infants.[21] Infants also tend to have a larger volume of distribution due to their higher concentration of extracellular fluid, where aminoglycosides reside.[8]
The elderly tend to have amikacin stay longer in their system; while the average clearance of amikacin in a 20-year-old is 6 L/hr, it is 3 L/hr in an 80-year-old.[22]
Clearance is even higher in people with cystic fibrosis.[23]
In people with muscular disorders such as myasthenia gravis or Parkinson's disease, amikacin's paralytic effect on neuromuscular junctions can worsen muscle weakness.[9]
Adverse effects
Side-effects of amikacin are similar to those of other aminoglycosides. Kidney damage and ototoxicity (which can lead to hearing loss) are the most important effects, occurring in 1–10% of users.[17] The nephro- and ototoxicity are thought to be due to aminoglycosides' tendency to accumulate in the kidneys and inner ear.[8]
Amikacin can cause neurotoxicity if used at a higher dose or for longer than recommended. The resulting effects of neurotoxicity include vertigo, numbness, tingling of the skin (paresthesia), muscle twitching, and seizures.[9] Its toxic effect on the 8th cranial nerve causes ototoxicity, resulting in loss of balance and, more commonly, hearing loss.[8] Damage to the cochlea, caused by the forced apoptosis of the hair cells, leads to the loss of high-frequency hearing and happens before any clinical hearing loss can be detected.[14][24] Damage to the ear vestibules, most likely by creating excessive oxidative free radicals. It does so in a time-dependent rather than dose-dependent manner, meaning that risk can be minimized by reducing the duration of use.[25]
The amikacin liposome inhalation suspension prescribing information includes a boxed warning regarding the increased risk of respiratory conditions including hypersensitivity pneumonitis (inflamed lungs), bronchospasm (tightening of the airway), exacerbation of underlying lung disease and hemoptysis (spitting up blood) that have led to hospitalizations in some cases.[20][5] Other common side effects in patients taking amikacin liposome inhalation suspension are dysphonia (difficulty speaking), cough, ototoxicity (damaged hearing), upper airway irritation, musculoskeletal pain, fatigue, diarrhea and nausea.[20][5]
Contraindications
Amikacin should be avoided in those who are sensitive to any aminoglycoside, as they are cross-allergenic (that is, an allergy to one aminoglycoside also confers hypersensitivity to other aminoglycosides). It should also be avoided in those sensitive to sulfite (seen more among people with asthma),[14] since most amikacin usually comes with sodium metabisulfite, which can cause an allergic reaction.[9]
In general, amikacin should not be used with or just before/after another drug that can cause neurotoxicity, ototoxicity, or nephrotoxicity. Such drugs include other aminoglycosides; the antiviral acyclovir; the antifungal amphotericin B; the antibiotics bacitracin, capreomycin, colistin, polymyxin B, and vancomycin; and cisplatin, which is used in chemotherapy.[9]
Amikacin can be inactivated by other beta-lactams, though not to the extent as other aminoglycosides, and is still often used with penicillins (a type of beta-lactam) to create an additive effect against certain bacteria, and carbapenems, which can have a synergistic effect against some Gram-positive bacteria. Another group of beta-lactams, the cephalosporins, can increase the nephrotoxicity of aminoglycoside as well as randomly elevating creatinine levels. The antibiotics chloramphenicol, clindamycin, and tetracycline have been known to inactivate aminoglycosides in general by pharmacological antagonism.[9]
Potent diuretics not only cause ototoxicity themselves, but they can also increase the concentration of amikacin in the serum and tissue, making the ototoxicity even more likely.[9]Quinidine also increases levels of amikacin in the body.[17] The NSAIDindomethacin can increase serum aminoglycoside levels in premature infants.[9] Contrast mediums such as ioversol increases the nephrotoxicity and otoxicity caused by amikacin.[17]
Amikacin can decrease the effect certain vaccines, such as the live BCG vaccine (used for tuberculosis), the cholera vaccine, and the live typhoid vaccine by acting as a pharmacological antagonist.[17]
Pharmacology
Mechanism of action
Amikacin irreversibly binds to 16S rRNA and the RNA-binding S12 protein of the 30S subunit of prokaryotic ribosome and inhibits protein synthesis by changing the ribosome's shape so that it cannot read the mRNAcodons correctly.[14][26] It also interferes with the region that interacts with the wobble base of the tRNA anticodon.[27] It works in a concentration-dependent manner, and has better action in an alkaline environment.[8]
At normal doses, amikacin-sensitive bacteria respond within 24–48 hours.[14]
Resistance
Amikacin evades attacks by all antibiotic-inactivating enzymes that are responsible for antibiotic resistance in bacteria, except for aminoacetyltransferase and nucleotidyltransferase.[28] This is accomplished by the L-hydroxyaminobuteroyl amide (L-HABA) moiety attached to N-1 (compare to kanamycin, which simply has a hydrogen), which blocks the access and decreases the affinity of aminoglycoside-inactivating enzymes.[28][29][30] Amikacin ends up with only one site where these enzymes can attack, while gentamicin and tobramycin have six.[16]
Bacteria that are resistant to streptomycin and capreomycin are still susceptible to amikacin; bacteria that are resistant to kanamycin have varying susceptibility to amikacin. Resistance to amikacin also confers resistance to kanamycin and capreomycin.[31]
Resistance to amikacin and kanamycin in Mycobacterium, the causative agent of tuberculosis, is due to a mutation in the rrs gene, which codes for the 16S rRNA. Mutations such as these reduce the binding affinity of amikacin to the bacteria's ribosome.[32] Variations of aminoglycoside acetyltransferase (AAC) and aminoglycoside adenylyltransferase (AAD) also confer resistance: resistance in Pseudomonas aeruginosa is caused by AAC(6')-IV, which also confers resistance to kanamycin, gentamicin, and tobramycin, and resistance in Staphylococcus aureus and S. epidermidis is caused by AAD(4',4), which also confers resistance to kanamycin, tobramycin, and apramycin.[29] Some strains of S. aureus can also inactivate amikacin by phosphorylating it.[18]
Pharmacokinetics
Amikacin is not absorbed orally and thus must be administered parenterally. It reaches peak serum concentrations in 0.5–2 hours when administered intramuscularly. Less than 11% of the amikacin actually binds to plasma proteins. It is distributed into the heart, gallbladder, lungs, and bones, as well as in bile, sputum, interstitial fluid, pleural fluid, and synovial fluids. It is usually found at low concentrations in the cerebrospinal fluid, except when administered intraventricularly.[9] In infants, amikacin is normally found at 10–20% of plasma levels in the spinal fluid, but the amount reaches 50% in cases of meningitis.[14] It does not easily cross the blood–brain barrier or enter ocular tissue.[8]
While the half-life of amikacin is normally two hours, it is 50 hours in those with end-stage renal disease.[16]
The majority (95%) of amikacin from an intramuscular or intravenous dose is secreted unchanged via glomerular filtration and into the urine within 24 hours.[9][16] Factors that cause amikacin to be excreted via urine include its relatively low molecular weight, high water solubility, and unmetabolized state.[21]
In dogs and cats, amikacin is commonly used as a topical antibiotic for ear infections and for corneal ulcers, especially those that are caused by Pseudomonas aeruginosa. The ears are often cleaned before administering the medication, since pus and cellular debris lessen the activity of amikacin.[35] Amikacin is administered to the eye when prepared as an ophthalmic ointment or solution, or when injected subconjunctivally.[38] Amikacin in the eye can be accompanied by cephazolin. Despite its use there amikacin (and all aminoglycosides) are toxic to intraocular structures.[39]
In horses, amikacin is FDA-approved for uterine infections (such as endometriosis and pyometra) when caused by susceptible bacteria.[40] It is also used in topical medication for the eyes and arthroscopic lavage; when combined with a cephalosporin, is used to treat subcutaneous infections that are caused by Staphylococcus. For infections in the limbs or joints, it is often administered with a cephalosporin via limb perfusion directly into the limb or injected into the joint.[35][41] Amikacin is also injected into the joints with the anti-arthritic medication Adequan in order to prevent infection.[42]
Side effects in animals include nephrotoxicity, ototoxicity, and allergic reactions at IM injection sites. Cats tend to be more sensitive to the vestibular damage caused by ototoxicity. Less frequent side effects include neuromuscular blockade, facial edema, and peripheral neuropathy.[8][35]
The half-life in most animals is one to two hours.[43]
Treating overdoses of amikacin requires kidney dialysis or peritoneal dialysis, which reduce serum concentrations of amikacin, and/or penicillins, some of which can form complexes with amikacin that deactivate it.[8]
^ abcdefghijklmnPlumb DC (2011). "Amikacin Sulfate". Plumb's Veterinary Drug Handbook (7th ed.). Stockholm, Wisconsin; Ames, Iowa: Wiley. pp. 39–43. ISBN978-0-470-95964-0.
^World Health Organization (2023). The selection and use of essential medicines 2023: web annex A: World Health Organization model list of essential medicines: 23rd list (2023). Geneva: World Health Organization. hdl:10665/371090. WHO/MHP/HPS/EML/2023.02.
^ abcdCunha BA (November 2006). "New uses for older antibiotics: nitrofurantoin, amikacin, colistin, polymyxin B, doxycycline, and minocycline revisited". The Medical Clinics of North America. Antimicrobial Therapy. 90 (6): 1089–1107. doi:10.1016/j.mcna.2006.07.006. PMID17116438. S2CID30373734.
^Maire P, Bourguignon L, Goutelle S, Ducher M, Jelliffe R (2017). "Chapter 20 – Individualizing Drug Therapy in the Elderly". In Jelliffe RW, Neely M (eds.). Individualized Drug Therapy for Patients. Boston: Academic Press. pp. 373–382. ISBN978-0-12-803348-7.
^Bauman RW (2015). Microbiology: with diseases by body system (4th ed.). Boston: Pearson. ISBN978-0-321-91855-0.
^"Amikacin". DrugBank. 2 August 2017. Archived from the original on 16 August 2017. Retrieved 10 August 2017.
^ abMudd E (7 August 2017). "O Aminoglycosides". Pharmacological Sciences. Archived from the original on 16 August 2017. Retrieved 14 August 2017.
^ abKondo S, Hotta K (March 1999). "Semisynthetic aminoglycoside antibiotics: Development and enzymatic modifications". Journal of Infection and Chemotherapy. 5 (1): 1–9. doi:10.1007/s101560050001. PMID11810483. S2CID38981498.
^Park JW, Ban YH, Nam SJ, Cha SS, Yoon YJ (December 2017). "Biosynthetic pathways of aminoglycosides and their engineering". Current Opinion in Biotechnology. Chemical biotechnology: Pharmaceutical biotechnology. 48: 33–41. doi:10.1016/j.copbio.2017.03.019. PMID28365471.
^Caminero JA, Sotgiu G, Zumla A, Migliori GB (September 2010). "Best drug treatment for multidrug-resistant and extensively drug-resistant tuberculosis". The Lancet. Infectious Diseases. 10 (9): 621–629. doi:10.1016/S1473-3099(10)70139-0. PMID20797644.
^Ahmad S, Mokaddas E (1 March 2014). "Current status and future trends in the diagnosis and treatment of drug-susceptible and multidrug-resistant tuberculosis". Journal of Infection and Public Health. 7 (2): 75–91. doi:10.1016/j.jiph.2013.09.001. PMID24216518.
^Orsini JA (1 August 2017). "Update on Managing Serious Wound Infections in Horses: Wounds Involving Joints and Other Synovial Structures". Journal of Equine Veterinary Science. 55: 115–122. doi:10.1016/j.jevs.2017.01.016. ISSN0737-0806.
^Wanamaker BP, Massey K (25 March 2014). Applied Pharmacology for Veterinary Technicians – E-Book. Elsevier Health Sciences. p. 392. ISBN978-0-323-29170-5.
^Papich MG (October 2015). "Amikacin". Saunders Handbook of Veterinary Drugs: Small and Large Animal (4th ed.). Elsevier Health Sciences. pp. 25–27. ISBN978-0-323-24485-5. Archived from the original on 10 September 2017.
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