Kolistimetatnatrium Noridem (Colistimethate Sodium)

Colistimethate Sodium is employed to combat severe Gram‑negative bacterial infections that involve the central nervous system. It is administered directly into the cerebrospinal fluid to achieve therapeutic concentrations.

• Gram‑negative meningitis: provides bactericidal activity to eradicate the pathogen in the CSF.
• Brain abscess due to Gram‑negative bacteria: facilitates bacterial clearance and reduces lesion size.
• Post‑neurosurgical infection: helps control resistant Gram‑negative pathogens after surgical procedures.

• Colistimethate Sodium is a prodrug that is converted to colistin, which binds to lipopolysaccharide and phospholipid components of the outer membrane of Gram‑negative bacteria. This interaction disrupts membrane integrity, increases permeability, and leads to leakage of intracellular contents, resulting in rapid bacterial cell death.

Colistimethate Sodium may cause a range of adverse reactions, varying from mild to severe. Monitoring for side effects is essential during therapy.

Common Side Effects

• Headache: mild to moderate intensity.
• Nausea: occasional, may resolve with supportive care.
• Fever: transient elevation of body temperature.
• Local irritation at injection site: redness or discomfort.

Serious or Rare Side Effects

• Neurotoxicity: seizures, encephalopathy, or peripheral neuropathy.
• Renal toxicity: acute kidney injury or elevated serum creatinine.
• Allergic anaphylaxis: rapid onset of urticaria, bronchospasm, or hypotension.
• Seizure activity: may occur independently of prior neurological status.

Prior to initiating therapy with Colistimethate Sodium, several safety considerations should be addressed.

• Renal function: monitor serum creatinine and urine output regularly.
• Neurological status: observe for signs of neurotoxicity such as confusion or seizures.
• Electrolytes: check serum magnesium and calcium levels frequently.
• Concomitant nephrotoxic drugs: avoid or adjust dosage when possible.
• Pregnancy: use only if potential benefits justify potential risks to the fetus.
• Store at ambient temperature: keep in original container, protect from light and moisture.

Colistimethate Sodium can interact with other medications, influencing safety and efficacy.

Major Interactions (Avoid)

• Aminoglycosides: additive nephrotoxicity.
• Loop diuretics: increased risk of renal impairment.
• Neuromuscular blocking agents: enhanced neurotoxicity.

Moderate Interactions (Monitor Closely)

• Vancomycin: potential additive renal toxicity.
• Non‑steroidal anti‑inflammatory drugs: monitor renal function.
• Contrast media: assess kidney function before use.