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# Mycoplasma (Pathogen, not a drug)
## Overview
*Mycoplasma* is a genus of bacteria that lacks a cell wall and is a common cause of various infections, particularly respiratory and urogenital tract infections. It is an opportunistic pathogen and can cause atypical pneumonia.
## Primary Indications
*Mycoplasma* infections are treated with antibiotics. The choice of antibiotic depends on the specific *Mycoplasma* species, the site of infection, patient factors (age, allergies, comorbidities), and local resistance patterns.
## Adult Dosing
Commonly used antibiotics for *Mycoplasma pneumoniae* infections include:
* **Azithromycin:** 500 mg orally on day 1, then 250 mg orally once daily for 4 days. Alternatively, 500 mg orally once daily for 3 days.
* **Clarithromycin:** 500 mg orally twice daily for 7-14 days.
* **Doxycycline:** 100 mg orally twice daily for 7-14 days.
## Pediatric Dosing
Dosing for children depends on the specific antibiotic and the child's weight. Consult current pediatric dosing guidelines.
* **Azithromycin:**
* Atypical pneumonia: 10 mg/kg orally on day 1 (maximum 500 mg), then 5 mg/kg orally once daily for 4 days (maximum 250 mg once daily).
* **Clarithromycin:** (Under recommendation for certain severe infections if alternatives are unsuitable, consult guidelines)
* **Doxycycline:** (Generally reserved for children >8 years unless benefits outweigh risks, consult guidelines)
## Dose Adjustments
* **Renal Impairment:** Generally, dose adjustments are not required for most antibiotics used for *Mycoplasma* infections, unless severe renal impairment is present. Consult specific drug information and patient's renal function.
* **Hepatic Impairment:** Caution and potential dose adjustment may be needed for macrolides (azithromycin, clarithromycin) in severe hepatic impairment.
## Contraindications
Contraindications are specific to the chosen antibiotic. For example:
* Macrolides are contraindicated in patients with a known hypersensitivity to the drug or other macrolides.
* Tetracyclines (like doxycycline) are contraindicated in children younger than 8 years for long-term use due to potential tooth discoloration, but may be used for specific short-term indications if benefits outweigh risks.
## Adverse Effects
Adverse effects are specific to the antibiotic prescribed. Common side effects with macrolides include gastrointestinal upset (nausea, vomiting, diarrhea, abdominal pain). Doxycycline can cause photosensitivity and gastrointestinal upset.
## Key Drug Interactions
Drug interactions are specific to the antibiotic. For example, macrolides can interact with CYP3A4 substrates, potentially increasing their serum concentrations. Doxycycline can chelate with divalent and trivalent cations, reducing absorption.
## Monitoring
* **Clinical Response:** Monitor for improvement in signs and symptoms of infection (fever, cough, etc.).
* **Adverse Effects:** Monitor for potential side effects of the prescribed antibiotic.
* **Culture and Susceptibility:** If possible, obtain respiratory or other relevant specimens for culture and susceptibility testing to confirm *Mycoplasma* and guide antibiotic choice, especially in cases of treatment failure or severe illness.
## Clinical Pearls
* *Mycoplasma pneumoniae* is a common cause of community-acquired pneumonia, often presenting as "walking pneumonia."
* Antibiotics that target cell wall synthesis (e.g., beta-lactams) are not effective against *Mycoplasma* due to its lack of a cell wall.
* Atypical pneumonia agents like macrolides, tetracyclines, and fluoroquinolones are preferred.
* Treatment duration may vary based on clinical response and severity of infection, often ranging from 7 to 14 days.
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**Educational Disclaimer:** This information is intended for healthcare professionals. It is essential to consult the most current prescribing information, local guidelines, and patient-specific factors before administering any medication.
