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# Miconazole Vaginal Pessary
## Overview
Miconazole is a synthetic imidazole antifungal agent. It works by inhibiting the synthesis of ergosterol, a vital component of fungal cell membranes, leading to increased cell membrane permeability and cell death.
## Primary Indications
Treatment of vulvovaginal candidiasis (yeast infections).
## Adult Dosing
* **100 mg vaginal pessary:** Insert one pessary vaginally at bedtime for 7 days.
* **200 mg vaginal pessary:** Insert one pessary vaginally at bedtime for 3 days.
* **Single dose 1200 mg vaginal suppository:** Not commonly available as a standard pessary, but if used, insert one suppository vaginally at bedtime.
## Pediatric Dosing
Safety and efficacy in pediatric patients have not been established. Use with caution and at the discretion of the prescriber.
## Dose Adjustments
No specific dose adjustments are generally required for renal or hepatic impairment.
## Contraindications
* Hypersensitivity to miconazole or any component of the formulation.
* Use with oral or systemic ketoconazole due to potential for increased plasma concentrations and risk of QT prolongation.
## Adverse Effects
* **Common:** Vulvar/vaginal irritation, burning, itching.
* **Less Common:** Pelvic cramps, lower abdominal pain, vaginal discharge.
## Key Drug Interactions
* **CYP3A4 Inhibitors/Substrates:** Miconazole is a moderate inhibitor of CYP3A4. Concomitant use with CYP3A4 substrates (e.g., certain statins, calcium channel blockers, benzodiazepines, anticoagulants like warfarin) may increase plasma concentrations of these drugs, potentially leading to toxicity. Dose adjustments or close monitoring of the co-administered drug may be necessary.
* **QT Prolonging Agents:** Use with other drugs known to prolong the QT interval should be avoided due to potential additive effects.
## Monitoring
* Monitor for signs and symptoms of vulvovaginal candidiasis.
* Monitor for adverse
