Xyloaid
Xyloaid Uses, Dosage, Side Effects, Food Interaction and all others data.
Bacitracin is a combination of at least 9 bacitracins. 60-80% of commercially prepared bacitracin is bacitracin A. The bacillus that produces bacitracin was first isolated from a knee scrape in 1945 from the knee wound of a child named Margaret Tracy.
Bacitracin was granted FDA approval on 29 July 1948.
Bacitracin is a mixture of polypeptides that prevent the formation of the bacterial cell wall and oxidatively cleave DNA. It has a short duration of action as it must be given every 3 to 4 hours topically. Bacitracin is nephrotoxic when given intramuscularly and may lead to renal failure.
Neomycin is a broad-spectrum aminoglycoside antibiotic drug that is derived from the metabolic products of Streptomyces fradiae. Neomycin is a complex comprised of three components, neomycin A, B, and C. Neomycin B, also known as framycetin, is the most active component of the complex and neomycin C is the isomer of neomycin B, making these two stereoisomers the active components of neomycin. Neomycin A, or neamine, is a moiety that conjoins two molecules of neomycin B and C together. Neomycin is active against both gram-positive and gram-negative organisms and mediates its pharmacological action by binding to bacterial ribosomes and inhibiting protein synthesis, which is crucial for the survival of bacteria.
Neomycin sulfate is the most common form for pharmaceutical preparations; because the compound is a complex, the amount of neomycin in products is measured in units. Neomycin sulfate as monotherapy is available in an oral solution for adjunct use in the treatment of hepatic coma. It is also used in combination with polymyxin B sulfates and hydrocortisone in otic suspensions for use in the treatment of bacterial infections in the external auditory canal, including infections caused by medical procedures in the ear. Neomycin is also used in combination with polymyxin B sulfates and dexamethasone in ophthalmic preparations for use in the treatment of inflammatory conditions and infections in the eye. Neomycin is also available in over-the-counter topical products to prevent minor skin infections.
Neomycin mediates its bactericidal action by inhibiting bacterial protein synthesis, thereby suppressing the growth and survival of susceptible bacteria. Following oral administration, the duration of bactericidal activity of neomycin ranged from 48 to 72 hours. By decreasing colonic bacteria that produce ammonia, neomycin was shown to be effective as an adjunctive therapy in hepatic coma to improve neurologic symptoms.
| Trade Name | Xyloaid |
| Generic | Bacitracin + Lignocaine + Neomycin + Polymyxin B (Sulphate) |
| Weight | 500iu/g, 4%w/w, 3.5mg/g, 5000iu/g |
| Type | Ointment |
| Therapeutic Class | |
| Manufacturer | Barrett Hodgson Pakistan (pvt) Ltd, |
| Available Country | Pakistan |
| Last Updated: | September 19, 2023 at 7:00 am |
Uses
Bacitracin is a cyclic polypeptide antibiotic used to prevent wound infections, treat pneumonia and empyema in infants, and to treat skin and eye infections.
Bacitracin is indicated in topical formulations for acute and chronic localized skin infections. Occasionally, it is also used intramuscularly for infantile streptococcal pneumonia and empyema. Bacitracin is also formulated as an ointment with neomycin and polymyxin B for over the counter use. A bacitracin ointment formulated with neomycin and polymyxin B along with hydrocortisone is indicated for the treatment of corticosteroid responsive dermatoses with secondary infection.
Neomycin is an aminoglycoside antibiotic agent used orally and topically to treat a wide variety of infections in the body.
Oral neomycin sulfate is indicated as an adjunctive therapy in hepatic coma (portal-system encephalopathy) by reducing ammonia-forming bacteria in the intestinal tract. It is strongly recommended that oral neomycin is only used in infections that are proven or strongly suspected to be caused by susceptible bacteria to reduce the risk of the development of drug-resistant bacteria.
Neomycin, in combination with polymyxin B sulfates and hydrocortisone in otic suspensions, is used in the treatment of superficial bacterial infections of the external auditory canal caused by organisms susceptible to the antibiotics. This otic formulation is also used in the treatment of infections of mastoidectomy and fenestration cavities caused by organisms susceptible to the antibiotics.
The ophthalmic solution containing neomycin in combination with polymyxin B sulfates and dexamethasone is used to treat steroid-responsive inflammatory ocular conditions for which a corticosteroid is indicated and where bacterial infection or a risk of bacterial infection exists.
Xyloaid is also used to associated treatment for these conditions: Acne, Bacterial Infections of the Intestine, Empyema, Eye Infections, Infected Wound, Infection, Inflammatory Reaction caused by Acne, Ocular Inflammatory Disease, Pneumonia, Skin Ulcer, Corticosteroid-responsive dermatoses, Infection in minor cuts, scrapes, or burns, Wound siteAcne pustular, Allergic Contact Dermatitis, Allergy Skin, Atopic Dermatitis (AD), Atopic Dermatitis (AD) of the external ear canal, Bacterial diarrhoea, Burns, Carbuncle, Cradle Cap, Dermatitis, Dermatitis, Contact, Dermatitis, Eczematous, Diarrhoea, Discoid Lupus Erythematosus (DLE), Ear infection bacterial, Ear infection bacterial caused by susceptible bacteria, Gastrointestinal Infections, Hepatic coma, Hidradenitis Suppurativa (HS), Hot Water Burns (Scalds), Impetigo, Impetigo contagious, Infantile Eczema, Infected Wounds, Infected skin ulcer, Infection of the outer ear caused by susceptible bacteria, Infectious diarrhea, Inflammatory Reaction caused by Acne, Intertrigo, Itching caused by Infection, Lichen Planus (LP), Localized Infection caused by susceptible bacteria, Nail infection, Neurodermatitis, Otitis Externa, Postoperative Wound Infection, Psoriasis Vulgaris (Plaque Psoriasis), Pustular Dermatosis, Radiodermatitis, Secondarily Infected Eczema, Secondary Bacterial Infection, Skin Burns, Skin Infections, Skin Infections, Bacterial, Skin Irritation, Skin Ulcer, Solar erythema, Abrasions, Blistering caused by Staphylococcus, Erythematous eruptions, Intertriginous erythema of the anogenital, Ocular bacterial infections caused by susceptible bacteria, Resistant to other corticosteroids Dermatosis, Susceptible Bacterial Infections
How Xyloaid works
Bacitracin binds to a divalent metal ion such as Mn(II), Co(II), Ni(II), Cu(II), or Zn(II). These complexes bind C55-isoprenyl pyrophosphate, preventing the hydrolysis of a lipid dolichol pyrophosphate, which finally inhibits cell wall synthesis. Bacitracin metal complexes also bind and oxidatively cleave DNA.
Like other aminoglycoside antibiotic drugs, neomycin inhibits bacterial ribosomes by binding to the 30S ribosomal subunit of susceptible bacteria and disrupting the translational machinery of bacterial protein synthesis. Bacterial translation is normally initiated by the mRNA binding to the 30S ribosomal subunit and subsequent binding with 50S subunit for elongation.
Toxicity
The oral LD50 of bacitracin in rats is >2000mg/kg.
Specific data regarding bacitracin overdoses is not readily available. An overdose of bacitracin may lead to nephrotoxicity and patients should be treated with supportive measures.
The oral LD50 of neomycin sulfate in mouse is > 8 g/kg. The subcutaneous LD50 is 200 mg/kg in rat and 190 mg/kg in mouse. The intraperitoneal LD50 in mouse is 305 mg/kg. The oral Lowest published toxic dose (TDLo) in woman is 12600 mg/kg/7D.
Because of low absorption, acute overdosage from oral neomycin is not likely to occur. However, prolonged administration of neomycin should be avoided because of the possibility of some systemic absorption and the risk of neurotoxicity, ototoxicity, and/or nephrotoxicity. Hemodialysis will remove neomycin from the blood. While nephrotoxicity and ototoxicity have been reported in otherwise patients without compromised renal function, the risk for developing these toxicities is increased in patients with renal impairment. Like other aminoglycosides, neomycin may cause fetal harm and total irreversible bilateral congenital deafness when administered in pregnant women.
Volume of Distribution
Data regarding the volume of distribution of bacitracin in humans is not readily available.
The small fraction of absorbed neomycin is rapidly distributed in the tissues. The amount of systemically absorbed neomycin is reported to increase cumulatively with each repeated dose administered until a steady state is reached.
Elimination Route
Topical, ophthalmic, and oral formulations of bacitracin are poorly absorbed systemically. Intramuscular bacitracin is readily and completely absorbed.
Neomycin is poorly absorbed from the gastrointestinal tract. Gastrointestinal absorption of the drug may be increased if inflammatory or ulcerative gastrointestinal disease is present.
Half Life
Data regarding the half life of bacitracin in humans is not readily available.
There is limited information on the half-life of neomycin.
Clearance
Data regarding the clearance of bacitracin in humans has not been well studied. A study of 9 subjects in 1947 shows a renal clearance of 105-283mL/min with an average renal clearance of 159mL/min.
There is limited information on the clearance rate of neomycin.
Elimination Route
Bacitracin is mainly excreted renally with 87% of and intramuscular dose being recovered in the urine after 6 hours.
The small absorbed fraction of neomycin is excreted by the kidney. The unabsorbed portion of the drug is excreted unchanged in the feces.
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