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# Miconazole Vaginal Pessary
## Overview
Miconazole is a synthetic imidazole antifungal agent. It disrupts fungal cell membrane integrity by inhibiting the synthesis of ergosterol.
## Primary Indications
Treatment of vulvovaginal candidiasis (yeast infection).
## Adult Dosing
* **100 mg pessary:** Insert one pessary vaginally at bedtime for 7 consecutive nights.
* **200 mg pessary:** Insert one pessary vaginally at bedtime for 3 consecutive nights.
* **100 mg/5 g vaginal cream:** Apply one applicatorful (approximately 5 g) vaginally at bedtime for 7 consecutive nights.
* **Higher strength creams (e.g., 2%):** May be used for shorter durations (e.g., 1 applicatorful for 3-7 nights), follow specific product labeling.
## Pediatric Dosing
Safety and efficacy in pediatric patients are not well established for vaginal formulations. Consultation with a pediatrician is recommended.
## Dose Adjustments
No specific dose adjustments are necessary for hepatic or renal impairment, as systemic absorption is minimal.
## Contraindications
* Hypersensitivity to miconazole or any component of the formulation.
* Use with CYP3A4 inhibitors (e.g., certain HIV protease inhibitors, macrolide antibiotics) due to potential for increased systemic miconazole levels and associated toxicity (e.g., QT prolongation, arrhythmias). This is particularly relevant if significant systemic absorption occurs, which is unlikely with vaginal administration but a theoretical concern.
## Adverse Effects
Common side effects include vaginal burning, itching, irritation, and lower abdominal cramping. Allergic reactions are rare.
## Key Drug Interactions
* **CYP3A4 inhibitors:** Concurrent use with oral miconazole is contraindicated. While systemic absorption of vaginal miconazole is low, caution is advised with other potent CYP3A4 inhibitors.
* **Warfarin:** Miconazole may increase the anticoagulant effect of warfarin. Monitor INR closely if used concurrently, especially with oral miconazole. Vaginal miconazole's interaction potential is less pronounced but not absent.
## Monitoring
* Monitor for signs and symptoms of infection resolution.
* Assess for any adverse effects or signs of local irritation.
## Clinical Pearls
* Complete the full course of treatment, even if symptoms improve earlier.
* Avoid sexual intercourse during treatment.
* Some formulations may weaken latex condoms and diaphragms; consider alternative barrier methods during treatment and for at least 72 hours after completion.
* If symptoms do not improve after the full course of treatment, or if symptoms worsen, re-evaluate diagnosis and consider alternative therapy.
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*This information is intended for healthcare professionals. It is essential to consult the most current prescribing information and relevant clinical guidelines for definitive patient care decisions.*
