Linezolid

What is Linezolid?

Linezolid is an antibiotic that belongs to a class of medications called oxazolidinones. It is used to treat serious bacterial infections caused by gram-positive bacteria, particularly those that are resistant to other antibiotics. Linezolid is typically reserved for infections that cannot be effectively treated with other, more commonly used antibiotics.

Uses

Linezolid is approved for treating several serious bacterial infections:

• Pneumonia: Including hospital-acquired pneumonia and community-acquired pneumonia caused by susceptible bacteria
• Skin and soft tissue infections: Complicated infections including diabetic foot infections and cellulitis
• Vancomycin-resistant enterococcal infections: Including bloodstream infections and urinary tract infections
• Methicillin-resistant Staphylococcus aureus (MRSA) infections: Various types of MRSA infections throughout the body
• Bacteremia: Blood infections caused by susceptible gram-positive bacteria

How it works

Linezolid works by inhibiting bacterial protein synthesis, which is essential for bacterial growth and reproduction. It binds to a specific part of the bacterial ribosome called the 23S portion of the 50S subunit, preventing the formation of functional proteins. This unique mechanism of action makes it effective against bacteria that have developed resistance to other antibiotics.

Side effects

Common side effects include:

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• Diarrhea
• Nausea and vomiting
• Headache
• Metallic taste in mouth
• Dizziness
• Constipation
• Insomnia
• Rash

Serious side effects to watch for:

• Bone marrow suppression (decreased blood cell counts)
• Peripheral neuropathy (nerve damage in hands and feet)
• Optic neuropathy (vision problems)
• Serotonin syndrome (when combined with certain medications)
• Clostridioides difficile-associated diarrhea

Warnings and precautions

• Blood monitoring required: Regular blood tests are necessary to monitor for bone marrow suppression, especially with prolonged use beyond 10-14 days
• Pregnancy considerations: Should only be used during pregnancy if potential benefits justify potential risks to the fetus
• Vision monitoring: Patients should be monitored for visual changes, especially during extended treatment courses
• Kidney function: Dose adjustments may be needed in patients with severe kidney disease, particularly those on dialysis
• Tyramine restriction: Patients should avoid foods high in tyramine (aged cheeses, cured meats, fermented foods) due to risk of hypertensive crisis

Interactions

Linezolid has several important drug interactions:

• Serotonergic medications: SSRIs, SNRIs, tricyclic antidepressants can increase risk of serotonin syndrome
• MAO inhibitors: Can cause dangerous increases in blood pressure and serotonin syndrome
• Sympathomimetic agents: Pseudoephedrine, phenylephrine may cause elevated blood pressure
• Dopaminergic agents: May enhance hypertensive effects
• Buspirone: Increased risk of serotonin syndrome
• Meperidine: Can cause serotonin syndrome and should be avoided
• Tramadol: Increases risk of seizures and serotonin syndrome
• Rifampin: May decrease linezolid effectiveness by increasing its clearance

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Dosage

Typical adult dosages for linezolid are:

• Oral tablets or suspension: 600 mg every 12 hours
• Intravenous infusion: 600 mg every 12 hours, administered over 30-120 minutes
• Treatment duration: Usually 10-14 days, but may extend to 28 days depending on infection type and response

Dosage adjustments may be necessary for patients with severe kidney disease or those receiving dialysis. The exact dosage and duration should always be determined by a healthcare provider based on the specific infection being treated, patient factors, and clinical response.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

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