Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
AMPHOTEC vs GYNIX
Clinician-reviewed, head-to-head comparison of mechanism, dosing, pharmacokinetics, and safety profiles.
Last clinically reviewed: July 2026 · OpiCalc Medical Review Team
Amphotericin B binds to ergosterol in fungal cell membranes, forming pores that disrupt membrane integrity, leading to leakage of intracellular contents and cell death.
Coagulative necrosis of tissue via trichloroacetic acid; chemical cauterization of epithelial cells.
Treatment of progressive, potentially life-threatening fungal infections: aspergillosis, cryptococcosis, blastomycosis, systemic candidiasis, coccidioidomycosis, histoplasmosis, mucormycosis, sporotrichosis,Treatment of visceral leishmaniasis (off-label),Empiric therapy in febrile neutropenic patients (off-label),Treatment of primary amebic meningoencephalitis (off-label)
Cervical inflammation,Vaginal infections,Treatment of genital warts,Chemical cautery of skin lesions
Initial dose: 0.5 mg/kg intravenously once daily, titrated as tolerated to 5 mg/kg once daily.
1 vaginal tablet (100 mg) once daily at bedtime for 7 days
Terminal half-life: 24-48 hours (up to 7 days in hepatic impairment). Long half-life allows once-daily dosing.
Terminal half-life is 2.5-3 hours in patients with normal renal function; prolonged to 6-8 hours in moderate renal impairment (Cr Cl 30-50 m L/min) and up to 12-15 hours in severe renal impairment (Cr Cl <30 m L/min).
Metabolized minimally, if at all; elimination is primarily via unchanged drug excretion in urine and bile over a prolonged period.
Not metabolized; acts locally via direct chemical action.
Biliary/fecal: ~90% unchanged; renal: <10% (mainly as metabolite).
Primarily renal (approximately 60-80% as unchanged drug) and biliary (20-30% as metabolites; unchanged drug not detected in bile). Fecal elimination accounts for <5%.
>95% bound to albumin and alpha-1-acid glycoprotein.
Approximately 20-30% bound to albumin with negligible binding to alpha-1-acid glycoprotein.
4.0 L/kg (large, indicates extensive tissue binding, especially in liver, spleen, and lungs).
Apparent Vd is 0.8-1.1 L/kg (range 0.6-1.3 L/kg), indicating extensive tissue distribution (e.g., lung, liver, bone).
Not applicable (IV only); if oral, <5% (due to poor absorption and first-pass metabolism).
Oral: 85-95% (immediate-release) and 70-80% (sustained-release due to first-pass effect). Vaginal: 5-10% (minimal systemic absorption). IV: 100%.
No dose adjustment required for renal impairment; however, monitor renal function closely during therapy.
No dose adjustment required for GFR ≥30 m L/min. For GFR <30 m L/min: use with caution, consider alternative therapy.
No specific dose adjustment recommended; use with caution in severe hepatic impairment.
Mild to moderate hepatic impairment (Child-Pugh A or B): no adjustment. Severe (Child-Pugh C): contraindicated.
5 mg/kg intravenously once daily; safety and efficacy not established in neonates.
Not approved for use in pediatric patients.
No specific dose adjustment; monitor renal function and electrolyte levels due to age-related decline in renal function.
No dose adjustment required; use same as adult dosing.
This drug should be used primarily for treatment of patients with progressive, potentially life-threatening fungal infections; it is not intended for treatment of non-invasive fungal infections (e.g., oral thrush, vaginal candidiasis) in patients with normal neutrophil counts.
None.
Nephrotoxicity: monitor renal function closely; risk increased with concurrent nephrotoxic drugs.,Infusion-related reactions: fever, chills, rigors, hypotension, dyspnea; premedicate as needed.,Electrolyte abnormalities: hypokalemia, hypomagnesemia; monitor levels and replace.,Hepatotoxicity: monitor liver function tests.,Cardiotoxicity: arrhythmias, especially with rapid infusion or hypokalemia.,Pulmonary toxicity: acute pulmonary edema (rare), especially in patients with low ejection fraction.
Avoid contact with normal tissue; risk of chemical burns; not for use on neoplastic lesions.
Hypersensitivity to amphotericin B or any component of the formulation (unless condition is life-threatening and amenable only to amphotericin therapy).
Hypersensitivity to trichloroacetic acid; pregnancy (relative); use on malignant tissue.
No specific food interactions. Ensure adequate hydration and electrolyte intake as directed. Avoid grapefruit juice as it may alter drug metabolism.
No known food interactions with topical use. However, avoid concurrent use of iodine-containing supplements or medications, as it may increase systemic iodine load.
Amphotericin B (AMPHOTEC) is classified as category B. Animal studies have not demonstrated fetal harm, but there are no adequate human studies in pregnant women. Inadvertent use during the first trimester is not associated with a significant increase in congenital anomalies. During the second and third trimesters, there is no evidence of fetal toxicity, although the drug should be used only if clearly needed due to maternal systemic fungal infection.
First trimester: Inadequate human data; animal studies not available. Theoretical risk based on pharmacologic action. Second and third trimesters: No known fetal harm from topical use. Systemic absorption minimal.
Amphotericin B is excreted into breast milk in low concentrations. The M/P ratio is unknown. It is considered compatible with breastfeeding because of poor oral bioavailability; however, caution is advised, and monitoring for infant diarrhea or thrush is recommended.
No data on excretion in human milk. Expected minimal systemic absorption. Use caution if applied to breast area. M/P ratio unknown.
Pharmacokinetic changes in pregnancy (increased volume of distribution, altered clearance) may require dose adjustment. Standard dosing is 3-5 mg/kg/day IV, but serum concentrations should be monitored to ensure therapeutic levels without excessive toxicity. Dose may need to be increased by 25-50% in the third trimester.
No dose adjustment necessary for topical use. Systemic absorption negligible.
Amphotec (amphotericin B liposomal) is the preferred formulation for invasive fungal infections due to reduced nephrotoxicity compared to deoxycholate. Monitor for infusion-related reactions (fever, rigors, hypotension) and premedicate with acetaminophen, diphenhydramine, and hydrocortisone. Requires baseline and serial renal function, electrolytes (especially potassium, magnesium), and liver function tests. Do not use with other nephrotoxic drugs if possible. Electrolyte repletion is critical.
GYNIX (povidone-iodine) is a topical antiseptic. Avoid use in patients with iodine hypersensitivity or thyroid disorders (e.g., Hashimoto's thyroiditis). Prolonged use on large wounds may cause iodine absorption and thyroid dysfunction. Monitor for local irritation or allergic contact dermatitis.
This medication treats serious fungal infections and is given intravenously in a hospital setting.,You may experience fever, chills, or shaking during the infusion; these can be managed with premedications.,Kidney function and blood electrolyte levels will be monitored regularly.,Report any signs of allergic reaction (rash, itching, difficulty breathing) or symptoms of electrolyte imbalance (muscle cramps, weakness, irregular heartbeat).,Avoid taking other medications that can harm the kidneys (e.g., certain antibiotics, NSAIDs) without consulting your doctor.
Do not use if you are allergic to iodine or have a thyroid condition.,For external use only. Avoid contact with eyes, mouth, or open wounds unless directed.,Discontinue and inform your doctor if you develop rash, itching, or swelling.,Store at room temperature away from light. Do not freeze or heat.,Not for use on deep or puncture wounds, or severe burns without medical advice.
No interactions on record
No interactions on record
Explore head-to-head clinical comparisons of other medications in the same therapeutic classes.
Common clinical questions about AMPHOTEC vs GYNIX, answered by our medical review team.
AMPHOTEC is a Antifungal that works by Amphotericin B binds to ergosterol in fungal cell membranes, forming pores that disrupt membrane integrity, leading to leakage of intracellular contents and cell death.. GYNIX is a Polyene Antifungal that works by Coagulative necrosis of tissue via trichloroacetic acid; chemical cauterization of epithelial cells.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between AMPHOTEC and GYNIX depend on the specific clinical indication. These are agents from distinct pharmacological classes and are not directly interchangeable by dose. A physician or clinical pharmacist should guide any therapeutic switching decisions.
The standard adult dose of AMPHOTEC is: Initial dose: 0.5 mg/kg intravenously once daily, titrated as tolerated to 5 mg/kg once daily.. The standard adult dose of GYNIX is: 1 vaginal tablet (100 mg) once daily at bedtime for 7 days. Dosing should always be individualized based on indication, renal and hepatic function, age, and other patient factors.
No direct drug-drug interaction has been formally documented between AMPHOTEC and GYNIX in current clinical databases. However, individual patient risk factors including other medications, organ function, and comorbidities should always be evaluated by a qualified healthcare provider.
The maternal-fetal safety profiles differ. AMPHOTEC is classified as Category C. Amphotericin B (AMPHOTEC) is classified as category B. Animal studies have not demonstrated fetal harm, but there are no adequate human studies in pregnant women. Inadvertent use d. GYNIX is classified as Category C. First trimester: Inadequate human data; animal studies not available. Theoretical risk based on pharmacologic action. Second and third trimesters: No known fetal harm from topical . Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.