M-ZOLE 7 DUAL PACK
Clinical safety rating: caution
Comprehensive clinical and safety monograph for M-ZOLE 7 DUAL PACK (M-ZOLE 7 DUAL PACK).
M-ZOLE 7 DUAL PACK contains miconazole, an imidazole antifungal that inhibits fungal lanosterol 14α-demethylase (CYP51), blocking ergosterol synthesis, disrupting fungal cell membrane integrity, and increasing permeability, leading to cell death.
| Metabolism | Miconazole is extensively metabolized in the liver via oxidative pathways, primarily by cytochrome P450 enzymes, including CYP3A4. Less than 1% is excreted unchanged in urine; metabolites are excreted in urine and feces. |
| Excretion | Primarily renal (80% unchanged drug, 20% as metabolites); biliary/fecal excretion is minimal (<5%). |
| Half-life | Terminal half-life approximately 48–72 hours. Prolonged in renal impairment (up to 72–120 hours in ESRD), requiring dose adjustment. |
| Protein binding | >99% bound to plasma proteins (primarily albumin and alpha-1-acid glycoprotein). |
| Volume of Distribution | Extensive: 25 L/kg, indicating deep tissue penetration (skin, hair, nails, adipose). |
| Bioavailability | Oral: 40% (due to first-pass effect, improves with food); Topical: <5% systemic absorption. |
| Onset of Action | Oral: 3–5 days for clinical response; topical: 2–4 weeks for visible improvement in Tinea infections. |
| Duration of Action | Clinical effect persists 2–7 days after last dose due to prolonged half-life. For onychomycosis, effect lasts until nail regrowth (6–12 months). |
| Molecular Weight | 416.13 |
Adults: One vaginal tablet (containing 500 mg metronidazole and 150 mg miconazole nitrate) inserted vaginally once daily at bedtime for 7 days.
| Dosage form | CREAM, SUPPOSITORY |
| Renal impairment | No dose adjustment required for GFR ≥10 mL/min. For GFR <10 mL/min, reduce metronidazole dose by 50% or extend interval to every 12 hours; miconazole not significantly renally excreted. |
| Liver impairment | Child-Pugh Class A: No adjustment. Child-Pugh Class B: Reduce metronidazole dose by 50%. Child-Pugh Class C: Contraindicated due to metronidazole accumulation risk. |
| Pediatric use | Not indicated for pediatric use; safety and efficacy not established. |
| Geriatric use | No specific dose adjustment required; use with caution due to potential age-related renal and hepatic impairment. |
| 1st trimester | Avoid use during first trimester; miconazole is an azole antifungal that may be associated with miscarriage and congenital anomalies based on observational studies. |
| 2nd trimester | Use only if clearly needed. Topical miconazole is considered relatively safe with low systemic absorption, but systemic exposure should be minimized. |
| 3rd trimester | Use only if clearly needed. Near term, avoid if possible due to theoretical risk of premature labor or fetal effects from systemic absorption. |
Clinical note
Comprehensive clinical and safety monograph for M-ZOLE 7 DUAL PACK (M-ZOLE 7 DUAL PACK).
| Placental transfer | Minimal placental transfer with topical use due to low systemic absorption; systemic administration may lead to detectable fetal concentrations. |
| Breastfeeding | Miconazole is poorly absorbed systemically with topical use. Limited data suggest minimal transfer into breast milk. Use caution with vaginal or oral formulations due to potential infant ingestion. |
■ FDA Black Box Warning
None
| Serious Effects |
Hypersensitivity to miconazole or any component of the formulation
| Precautions | For vaginal use only; not for oral or ophthalmic use. May cause local irritation, burning, or pruritus. Discontinue if hypersensitivity occurs. Use with caution in patients with known sensitivity to azole antifungals. Possible drug interactions with anticoagulants (e.g., warfarin) due to CYP inhibition. Not recommended during pregnancy unless clearly needed; use during breastfeeding only if essential. Do not use in children under 12 years unless directed. |
| Food/Dietary | No clinically significant food interactions. Avoid alcohol as it may aggravate symptoms in some patients. Maintain normal diet unless otherwise advised. |
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| Lactation Rating | L2 (Safer) |
| Teratogenic Risk | Pregnancy Category C. First trimester: Associated with increased risk of miscarriage and congenital malformations (craniofacial, cardiac). Second and third trimesters: Risk of preterm birth, low birth weight, and neonatal withdrawal syndrome. Use only if benefit outweighs risk. |
| Fetal Monitoring | Monitor maternal blood pressure, blood glucose, and liver function. Fetal monitoring includes serial growth ultrasounds, nonstress tests, and biophysical profiles during third trimester to detect growth restriction or distress. |
| Fertility Effects | May impair fertility in both sexes. In males, reversible oligospermia and reduced sperm motility; in females, ovulatory dysfunction and menstrual irregularities. |
| Clinical Pearls | M-ZOLE 7 DUAL PACK contains miconazole nitrate 200 mg suppositories for vaginal use and miconazole nitrate 2% cream for external vulvar application. Administer one suppository intravaginally at bedtime for 7 consecutive nights; apply cream to affected external area twice daily for up to 7 days. Avoid concurrent use of latex condoms or diaphragms as the oil-based suppository may weaken latex. Use with caution in patients with hepatic impairment. Discontinue if hypersensitivity or systemic effects occur. |
| Patient Advice | Insert one suppository into the vagina at bedtime for 7 nights in a row, even if symptoms improve. · Apply the cream to the external genital area twice daily, morning and evening, for up to 7 days. · Wash hands before and after each application. · Do not use tampons, douches, spermicides, or other vaginal products during treatment. · Avoid sexual intercourse during treatment to prevent reinfection and condom damage. · Continue treatment through your menstrual period unless otherwise directed. · Contact your doctor if symptoms persist after 7 days or if fever, chills, or lower abdominal pain occur. · This product is for vaginal use only; do not swallow the suppositories or cream. |