Polymyxin B Sulfate is used for treating infections caused by susceptible organisms, including meningitis.
- IV (Intravenous): Dilute 500,000 units in 300–500 mL of Dextrose 5% (D5W). Infuse over 60–90 minutes.
- IM (Intramuscular): Reconstitute the vial with 2 mL of sterile water for injection (SWI), normal saline (NS), or 1% procaine hydrochloride. Inject deeply into the upper outer quadrant of the gluteal muscle.
- IT (Intrathecal): Reconstitute with 10 mL of NS. Do not use procaine HCl for intrathecal administration.
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Polymyxin B targets the phospholipids in the bacterial membrane of gram-negative organisms, compromising membrane integrity and causing intracellular contents to leak, ultimately killing the bacteria.
Toxicity due to Lipoxin B overdose has been reported and can result in neuromuscular blockade, leading to serious complications such as:
It can also lead to kidney failure, marked by low urine output and elevated blood urea nitrogen (BUN) and creatinine levels.
There is no specific antidote for an overdose. In such cases:
Adults
IV for infections: 15,000–25,000 units/kg/day via continuous infusion or 12-hourly intermittent infusions over 60–120 minutes. Max dose: 2,000,000 units/day.
IM for infections: 25,000–30,000 units/kg/day divided every 4–6 hours. Max: 2,000,000 units/day.
IT for meningitis: 50,000 units once daily for 3–4 days, then every other day for at least 2 weeks after CSF cultures are sterile and glucose levels normalize. Max: 2,000,000 units/day.
Children
IV for infections:
<2 years: 40,000 units/kg/day, given every 12 hours.
≥2 years: Same as adult dosage.
IM for infections:
<2 years: 40,000 units/kg/day divided every 6 hours. (Use is discouraged due to injection site pain.)
≥2 years: Same as adult dose, but also not routinely advised.
IT for meningitis:
<2 years: 20,000 units once daily for 3–4 days or 25,000 units every other day, then continued treatment based on clinical response.
CrCl >20 mL/min: 75–100% of the standard daily dose, divided every 12 hours.
CrCl 5–20 mL/min: Use 50% of the usual daily dose, divided every 12 hours.
CrCl <5 mL/min: Administer 15% of the standard daily dose every 12 hours.
Serious Interactions:
Risk of neurotoxicity or kidney damage increases when used with other similar agents such as:
bacitracin, aminoglycosides (e.g., gentamicin, amikacin), colistin, and others.
Combining with neuromuscular blocking agents (like anesthetics or muscle relaxants) may lead to respiratory paralysis.
Known allergy to polymyxins.
Avoid combining with nephrotoxic or neurotoxic agents and neuromuscular blockers.
There is no adequate data from controlled studies on the use of Lipoxin B in pregnant women. Its safety during pregnancy has not been confirmed.
Regarding breastfeeding, no specific guidance is available. It is also unknown whether the drug passes into human breast milk.
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