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# Miconazole vaginal pessary
## Overview
Miconazole is an imidazole antifungal agent that inhibits the synthesis of ergosterol, a vital component of fungal cell membranes. It is available as a vaginal suppository (pessary) for the local treatment of vulvovaginal candidiasis.
## Primary Indications
* Vulvovaginal candidiasis (yeast infection).
## Adult Dosing
* **100 mg suppository:** Insert one pessary intravaginally daily at bedtime for 7 consecutive days.
* **200 mg suppository:** Insert one pessary intravaginally daily at bedtime for 3 consecutive days.
* **1200 mg (single dose) suppository:** Insert one pessary intravaginally at bedtime as a one-time dose.
* **Maximum:** Do not exceed the prescribed course of therapy; persistent symptoms require medical evaluation to rule out other causes (e.g., bacterial vaginosis or trichomoniasis).
## Pediatric Dosing
* **Adolescents (≥12 years):** Same as adult dosing.
* **Children (<12 years):** Safety and efficacy have not been established. Use is generally not recommended without pediatric specialist consultation.
## Dose Adjustments
* **Renal/Hepatic Impairment:** No systemic dose adjustment required due to minimal systemic absorption; however, caution is advised in patients with compromised skin/mucosa integrity.
## Contraindications
* Hypersensitivity to miconazole or any component of the formulation.
## Adverse Effects
* **Local:** Vulvovaginal burning, itching, irritation, or soreness post-insertion.
* **Systemic:** Rarely, pelvic cramps, headache, or skin rash.
## Key Drug Interactions
* **Warfarin:** Topical miconazole can cause a significant increase in the International Normalized Ratio (INR) due to systemic absorption and inhibition of hepatic CYP2C9. Monitor INR closely if concomitant use is necessary.
* **Latex/Diaphragms:** Miconazole may damage latex or polyurethane-based barrier contraceptives (condoms, diaphragms). Avoid these products during treatment and for at least 72 hours after therapy.
## Monitoring
* Monitor for resolution of symptoms. If symptoms persist beyond the treatment course or recur within 2 months, evaluate for underlying conditions (e.g., diabetes, immune deficiency) or resistant fungal species.
## Clinical Pearls
* **Administration:** Pessaries are designed for nighttime use while lying down to minimize leakage.
* **Hygiene:** Complete the full course of treatment even if symptoms resolve during menstruation. Patients should avoid tampon use while using vaginal antifungal products.
* **Sexual Activity:** Avoid sexual intercourse during treatment to prevent irritation or potential barrier contraceptive failure.
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**Disclaimer:** This information is for educational purposes and reflects common clinical practice. Always verify current prescribing information, institutional protocols, and patient-specific contraindications via formal drug databases (e.g., Lexicomp, Micromedex) before prescribing or administering medication.
