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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. The vaginal pessary (suppository) formulation acts primarily through local contact to treat vulvovaginal candidiasis.
## Primary Indications
Treatment of vulvovaginal candidiasis (yeast infections).
## Adult Dosing
* **1200 mg:** Single dose (1 pessary) intravaginally at bedtime.
* **400 mg:** 1 pessary intravaginally daily at bedtime for 3 days.
* **100 mg:** 1 pessary intravaginally daily at bedtime for 7 days.
* *Note: Dosing regimens vary significantly by regional availability and OTC vs. prescription labeling.*
## Pediatric Dosing
Safety and efficacy have not been established for prepubertal children. Use in adolescents should follow adult dosing guidelines, provided a pelvic exam has confirmed the diagnosis.
## Dose Adjustments
* **Renal/Hepatic Impairment:** No systemic dose adjustment required due to minimal systemic absorption; however, caution is advised in patients with compromised vaginal mucosa.
## Contraindications
* Hypersensitivity to miconazole or any component of the formulation.
## Adverse Effects
* **Common:** Localized vulvovaginal burning, itching, irritation, or pelvic cramping.
* **Rare:** Contact dermatitis or allergic reaction.
## Key Drug Interactions
* **Warfarin:** Although systemic absorption is low, systemic miconazole is a potent CYP3A4 inhibitor and can significantly increase INR. Monitor patients closely if they are on warfarin therapy while using vaginal miconazole.
* **Contraceptives:** Miconazole may weaken latex products (condoms, diaphragms). Avoid these contraceptive methods during treatment and for 72 hours after completion.
## Monitoring
* Monitor for resolution of symptoms. If symptoms persist beyond 7 days or recur within 2 months, the patient should be re-evaluated to rule out other pathogens (e.g., bacterial vaginosis, trichomoniasis) or underlying conditions (e.g., diabetes).
## Clinical Pearls
* **Administration:** Insert as high into the vagina as possible using the applicator provided or as directed. Best administered at bedtime to minimize leakage and maximize retention.
* **Concurrent Use:** Avoid tampon use during treatment. Ensure the course is completed even if menstruation begins.
* **Diagnosis:** Advise patients that recurring infections may signal an underlying issue such as uncontrolled diabetes or immunocompromise.
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*Disclaimer: This information is for educational purposes and does not replace professional clinical judgment. Always verify current prescribing information, local institutional protocols, and patient-specific factors before administration.*
