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## Mycoplasma hominis (Pathogen, not a Drug)
### Overview
*Mycoplasma hominis* is a bacterium that can cause genitourinary tract infections in women, particularly bacterial vaginosis, and postpartum fever. It is a common cause of non-gonococcal urethritis and pelvic inflammatory disease in men and women.
### Primary Indications
* Treatment of infections caused by *Mycoplasma hominis*, often as part of a polymicrobial infection.
### Adult Dosing
Dosing depends on the specific infection and antibiotic used. Common antibiotics for *Mycoplasma hominis* include:
* **Doxycycline:** 100 mg orally every 12 hours for 7-14 days.
* **Clindamycin:** 450 mg orally every 6-8 hours for 7-14 days, or 900 mg IV every 8 hours for severe infections.
* **Levofloxacin:** 500 mg orally or IV once daily for 7-14 days.
* **Azithromycin:** 500 mg orally on day 1, then 250 mg orally once daily for 4 days (or a single 1g dose for uncomplicated urogenital infections).
### Pediatric Dosing
There is limited established pediatric dosing for *Mycoplasma hominis* infections. Treatment decisions should be guided by the specific antibiotic chosen and the patient's weight, age, and clinical condition. Consult infectious disease specialists for pediatric management.
### Dose Adjustments
* **Renal Impairment:** Doxycycline and levofloxacin may require dose adjustment in severe renal impairment. Clindamycin and azithromycin generally do not require dose adjustment for renal impairment.
* **Hepatic Impairment:** Use with caution. Dose adjustments may be necessary for azithromycin and clindamycin in severe hepatic impairment.
### Contraindications
Contraindications are specific to the antibiotic agent used for treatment, not *Mycoplasma hominis* itself. For example, tetracyclines (like doxycycline) are contraindicated in children younger than 8 years of age due to potential tooth discoloration. Hypersensitivity to the chosen antibiotic is a contraindication.
### Adverse Effects
Adverse effects are dependent on the antibiotic used. Common side effects include:
* **Doxycycline:** Gastrointestinal upset, photosensitivity, yeast infections.
* **Clindamycin:** Diarrhea (including *Clostridioides difficile*-associated diarrhea), nausea, rash.
* **Levofloxacin:** Gastrointestinal upset, headache, dizziness, tendon rupture (black box warning).
* **Azithromycin:** Gastrointestinal upset, QT interval prolongation.
### Key Drug Interactions
Drug interactions are specific to the antibiotic chosen for treatment. For example:
* **Doxycycline:** Can decrease the efficacy of oral contraceptives. Antacids, iron supplements, and dairy products can decrease absorption.
* **Clindamycin:** Neuromuscular blocking agents (may potentiate).
* **Levofloxacin:** Antacids containing aluminum or magnesium, iron, zinc, sucralfate, and divalent/trivalent cations can significantly decrease absorption.
### Monitoring
* Monitor for signs and symptoms of infection resolution.
* Monitor for adverse effects of the chosen antibiotic.
* For fluoroquinolones (levofloxacin), monitor for signs of tendon inflammation or rupture.
* For clindamycin, monitor for diarrhea and signs of *C. difficile* infection.
### Clinical Pearls
* *Mycoplasma hominis* is often part of a mixed infection, so broader spectrum coverage may be initially considered.
* Antibiotic resistance can occur, so susceptibility testing is recommended when available, especially for recurrent or treatment-failure cases.
* Treatment duration varies based on the site and severity of infection.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant guidelines before making any clinical decisions. Dosing and recommendations may vary based on local protocols and individual patient factors.
