Please check your internet connection and try again.
# Mycoplasma (Pathogen, Not a Drug)
## Overview
*Mycoplasma* refers to a genus of bacteria that lack a cell wall. Certain species, such as *Mycoplasma pneumoniae*, are significant human pathogens.
## Primary Indications
*Mycoplasma* species are pathogens, not drugs. Treatment is indicated for infections caused by pathogenic *Mycoplasma* species. *Mycoplasma pneumoniae* commonly causes respiratory tract infections, including pneumonia (often referred to as "walking pneumonia").
## Adult Dosing
Treatment depends on the specific *Mycoplasma* species and severity of infection. Common choices include macrolides, tetracyclines, or fluoroquinolones. Specific dosing varies and depends on local antimicrobial resistance patterns and clinical guidelines.
* **Macrolides:** Azithromycin 500 mg once on day 1, then 250 mg once daily for 4 more days. Alternatively, clarithromycin or erythromycin may be used.
* **Tetracyclines:** Doxycycline 100 mg twice daily for 7-14 days.
* **Fluoroquinolones:** Levofloxacin or moxifloxacin may be used, particularly in severe cases or when macrolides/tetracyclines are contraindicated.
## Pediatric Dosing
Dosing for *Mycoplasma* infections in children varies by age, weight, and the chosen antibiotic.
* **Azithromycin:**
* Children < 6 months: Safety and efficacy not established.
* Children ≥ 6 months: 10 mg/kg (up to 500 mg) on day 1, followed by 5 mg/kg (up to 250 mg) on days 2-5.
* **Tetracyclines:** Generally avoided in children < 8 years due to potential tooth discoloration, with some exceptions for specific indications and short durations under close supervision.
* **Fluoroquinolones:** Use is generally reserved for situations where other agents cannot be used due to potential risk of arthropathy.
## Dose Adjustments
Dose adjustments for renal or hepatic impairment are typically based on the specific antibiotic prescribed, not the *Mycoplasma* infection itself. Consult drug-specific information.
## Contraindications
Contraindications are specific to the antibiotic chosen for treatment. For example, macrolides are contraindicated in patients with a known hypersensitivity. Tetracyclines are generally contraindicated in pregnant women and children under 8 years old.
## Adverse Effects
Adverse effects are specific to the antibiotic and the patient's reaction. Common adverse effects of macrolides include gastrointestinal upset. Tetracyclines can cause photosensitivity and gastrointestinal upset. Fluoroquinolones carry risks of tendon rupture, CNS effects, and QT interval prolongation.
## Key Drug Interactions
Drug interactions are dependent on the chosen antimicrobial agent. For example, macrolides can inhibit CYP3A4, affecting the metabolism of numerous drugs. Tetracyclines can chelate with divalent and trivalent cations (e.g., calcium, iron, magnesium, zinc), reducing absorption. Fluoroquinolones can interact with antacids, sucralfate, and dairy products.
## Monitoring
Monitoring should focus on the patient's clinical response to treatment and any adverse effects from the prescribed antibiotic. For specific antibiotics, routine laboratory monitoring may be indicated (e.g., LFTs, renal function).
## Clinical Pearls
* *Mycoplasma pneumoniae* infections often present with a more gradual onset compared to bacterial pneumonias.
* Diagnosis can be challenging and may require specific serological tests or PCR.
* Antibiotic choice should consider local resistance patterns and patient factors.
* Treatment duration is typically 7-14 days but can vary.
***
*This information is intended for healthcare professionals. Always refer to the most current prescribing information and consult with a specialist when making clinical decisions. Local guidelines and formulary may influence drug selection and dosing.*
