Linezolid Krka (Linezolid)

Linezolid is an oxazolidinone antibiotic indicated for infections caused by susceptible Gram‑positive bacteria.

• Skin and soft tissue infections: effective against methicillin‑resistant Staphylococcus aureus and other resistant strains.
• Community‑acquired and nosocomial pneumonia: used when first‑line agents are unsuitable or resistance is present.
• Complicated Gram‑positive infections: includes bacteremia, endocarditis and osteomyelitis caused by susceptible organisms.

• Linezolid inhibits bacterial protein synthesis by binding to the 50S ribosomal subunit, preventing formation of the initiation complex. This action blocks the translation process, halting bacterial growth and leading to a bacteriostatic effect against susceptible Gram‑positive organisms.

Adverse reactions may occur with linezolid therapy and are categorized by frequency.

Common Side Effects

• Nausea: mild to moderate gastrointestinal upset.
• Diarrhea: loose stools occurring during treatment.
• Headache: transient cranial discomfort.
• Vomiting: occasional emesis.
• Metallic taste: altered taste perception.
• Rash: mild skin erythema.

Serious or Rare Side Effects

• Thrombocytopenia: significant drop in platelet count requiring monitoring.
• Peripheral neuropathy: nerve damage presenting as tingling or numbness.
• Serotonin syndrome: risk when combined with serotonergic agents.
• Lactic acidosis: rare metabolic disturbance.
• Optic neuropathy: vision changes that may be irreversible.
• Severe hypersensitivity: anaphylactic reactions requiring immediate care.

Before initiating linezolid, clinicians should consider several safety measures.

• Monitor blood counts: perform regular CBC to detect thrombocytopenia.
• Assess renal function: adjust therapy if renal impairment is present.
• Evaluate serotonergic medication use: avoid concomitant SSRIs, SNRIs, or MAO inhibitors.
• Use caution in hepatic impairment: liver dysfunction may affect drug clearance.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Linezolid may interact with other medicines, requiring attention to the level of risk.

Major Interactions (Avoid)

• Serotonergic agents: SSRIs, SNRIs, MAO inhibitors can precipitate serotonin syndrome.
• Rifampin: strong enzyme inducer that reduces linezolid plasma concentrations.
• MAO inhibitors: increase risk of hypertensive crisis.

Moderate Interactions (Monitor Closely)

• NSAIDs: may increase bleeding tendency when combined with linezolid.
• Warfarin: potential alteration of INR values.
• Antacids containing magnesium or aluminum: may affect absorption if given simultaneously.