AMMONIUM LACTATE
Clinical safety rating: caution
Comprehensive clinical and safety monograph for AMMONIUM LACTATE (AMMONIUM LACTATE).
Ammonium lactate provides emollient and humectant effects, reducing epidermal hyperkeratinization and increasing stratum corneum hydration via lactic acid's keratolytic action.
| Metabolism | Topical ammonium lactate undergoes minimal systemic absorption; any absorbed lactic acid is metabolized via lactate dehydrogenase to pyruvate, entering the citric acid cycle. |
| Excretion | Ammonium lactate is a topical agent; systemic absorption is minimal. Following application, lactic acid is rapidly metabolized to carbon dioxide and water, or converted to glucose in the liver. Ammonium is metabolized to urea in the liver. Any absorbed lactate and ammonium are primarily eliminated via the kidneys; less than 5% of a topically applied dose is excreted unchanged in urine. |
| Half-life | Not applicable systemically; due to negligible systemic absorption (percutaneous absorption <5%), no terminal elimination half-life is defined. The metabolic turnover of lactate and ammonium follows endogenous kinetics. |
| Protein binding | Negligible; lactate and ammonium are endogenous substances with minimal protein binding (<5%). Lactic acid does not exhibit significant binding to plasma proteins. |
| Volume of Distribution | Not applicable; due to minimal systemic absorption, Vd is not clinically relevant. For absorbed fraction, lactate distributes to total body water (approximately 0.5 L/kg), and ammonium distributes similarly. |
| Bioavailability | Topical: Systemic bioavailability is less than 5% based on percutaneous absorption studies. Oral: Not formulated; if ingested, bioavailability would be high due to immediate absorption, but this route is not indicated. |
| Onset of Action | Topical: Clinical improvement in xerosis and ichthyosis vulgaris is typically observed within 1–2 weeks of twice-daily application. Moisturizing effect may begin within hours of application. |
| Duration of Action | Duration of moisturizing effect is approximately 24 hours with once-daily use, but optimal efficacy for desquamation requires consistent application for several weeks. Effects on skin barrier function persist only with continued use; after discontinuation, xerosis recurs within days to weeks. |
Topical application to affected areas twice daily.
| Dosage form | CREAM |
| Renal impairment | No dosage adjustment required for topical use; minimal systemic absorption. |
| Liver impairment | No dosage adjustment required for topical use; minimal systemic absorption. |
| Pediatric use | Apply topically to affected areas twice daily; safety and efficacy in children <2 years not established. |
| Geriatric use | Same as adult dosing; no specific adjustments needed for topical use. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
Comprehensive clinical and safety monograph for AMMONIUM LACTATE (AMMONIUM LACTATE).
| Breastfeeding | Systemic absorption of topical ammonium lactate is minimal. It is not known whether the drug is excreted in human milk. Due to the low likelihood of significant milk levels, the American Academy of Pediatrics considers it compatible with breastfeeding. M/P ratio is not established because systemic levels are negligible. |
| Teratogenic Risk | Ammonium lactate is a topical agent with negligible systemic absorption. Animal studies have not shown teratogenicity. In pregnant women, no well-controlled studies exist; however, due to minimal systemic exposure, the risk of fetal harm is considered low across all trimesters. The FDA has not assigned a pregnancy category; clinical guidance typically permits use if clearly needed. |
■ FDA Black Box Warning
None.
| Serious Effects |
["Hypersensitivity to any component of the formulation."]
| Precautions | ["Avoid contact with eyes, lips, and mucous membranes.","Use with caution in patients with impaired renal function (risk of lactic acidosis with extensive application).","Not for use on open wounds or broken skin."] |
| Food/Dietary | No known food interactions. |
| Clinical Pearls | Ammonium lactate is a combination of lactic acid and ammonium hydroxide, functioning as an emollient and keratolytic. It is primarily used for xerosis (dry skin) and ichthyosis vulgaris. Avoid contact with eyes and mucous membranes. Can cause transient stinging, especially on cracked or fissured skin. Not recommended for use on open wounds or infected skin. |
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| Fetal Monitoring | No specific monitoring is required beyond routine prenatal care. Because systemic absorption is minimal with topical application, no fetal or maternal monitoring specific to ammonium lactate is necessary. |
| Fertility Effects | No known effects on fertility in animal studies or human data. Systemic exposure from topical application is negligible, making effects on reproductive function unlikely. |
| Patient Advice | Apply to affected areas twice daily or as directed. · Avoid contact with eyes, mouth, and mucous membranes. · May cause mild stinging or burning, especially on broken skin; this usually subsides. · Do not use on open wounds or infected skin unless directed by a doctor. · Use sunscreen if exposed to sunlight, as this product may increase photosensitivity. · If irritation persists or worsens, discontinue use and consult a healthcare provider. |