Polymyxin B

DOSAGE AND ADMINISTRATION PARENTERAL Intravenous Dissolve 500,000 polymyxin B units in 300 to 500 mL solutions for parenteral 5% Dextrose Injection for continuous drip. Adults and children 15,000 to 25,000 units/kg body weight/day in individuals with normal kidney function. This amount should be reduced from 15,000 units/kg downward for individuals with kidney impairment.

Infusions may be given every 12 hours; however, the total daily dose must not exceed 25,000 units/kg/day. Infants Infants with normal kidney function may receive up to 40,000 units/kg/day without adverse effects. Intramuscular Not recommended routinely because of severe pain at injection sites, particularly in infants and children.

Dissolve 500,000 Polymyxin B units in 2 mL Sterile Water for Injection or 0.9 % Sodium Chloride Injection or Procaine Hydrochloride Injection 1%. Adults and children 25,000 to 30,000 units/kg/day. This should be reduced in the presence of renal impairment. The dosage may be divided and given at either 4 or 6 hour intervals.

Infants Infants with normal kidney function may receive up to 40,000 units/kg/day without adverse effects. Note : Doses as high as 45,000 units/kg/day have been used in limited clinical studies in treating prematures and newborn infants for sepsis caused by Ps aeruginosa. Intrathecal A treatment of choice for Ps aeruginosa meningitis .

Children under 2 years of age 20,000 units once daily, intrathecally for 3 to 4 days or 25,000 units once every other day. Continue with a dose of 25,000 units once every other day for at least 2 weeks after cultures of the cerebrospinal fluid are negative and sugar content has returned to normal. IN THE INTEREST OF SAFETY, SOLUTIONS OF PARENTERAL USE SHOULD BE STORED UNDER REFRIGERATION, AND ANY UNUSED PORTIONS SHOULD BE DISCARDED AFTER 72 HOURS.