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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Lactic Acid, Salicylic Acid
Brand Name
Cornex
Generic Name
Lactic Acid, Salicylic Acid
Active Ingredient
Lactic AcidCategory
Non-Standardized Plant Allergenic Extract [EPC]
Variants
1
Different strengths and dosage forms
| Strength | Form | Route | NDC |
|---|---|---|---|
| 2505 mg/15g | GEL | TOPICAL | 82160-238 |
Detailed information about Cornex
This page is for informational purposes only and does not replace medical advice. Before using any prescription or over-the-counter medication for Cornex, you must consult a qualified healthcare professional.
Lactic acid is a multifaceted compound used as an alpha-hydroxy acid (AHA) for skin conditions, a vaginal acidifier for pH balance, and an intravenous electrolyte component. It belongs to several classes including nitrogen-binding agents and calculi dissolution agents.
The dosage of lactic acid varies significantly based on the condition being treated and the specific product used.
Lactic acid is generally considered safe for pediatric use when applied topically, but caution is required.
For topical use, no specific dosage adjustments are typically required. However, for systemic (IV) administration of lactate-containing solutions, extreme caution is necessary. Patients with severe renal impairment may not be able to clear the metabolic byproducts of lactate, potentially worsening metabolic imbalances. Monitoring of serum electrolytes and acid-base status is mandatory.
Since the liver is the primary site for lactate metabolism, patients with hepatic failure or cirrhosis are at a high risk for developing lactic acidosis if given systemic lactate. Topical use is generally safe, but systemic administration should be avoided or used with extreme caution under close medical supervision.
Elderly patients often have thinner skin and may be more prone to irritation from topical lactic acid. It is often recommended to start with a lower frequency of application (e.g., once daily) to assess tolerance. For systemic use, age-related declines in renal and hepatic function must be considered when calculating infusion rates.
If you miss a dose of topical or vaginal lactic acid, apply it as soon as you remember. If it is almost time for your next scheduled dose, skip the missed dose and return to your regular routine. Do not apply double the amount to make up for a missed application. Consistency is key to achieving the best results, especially for chronic skin conditions.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose or stop treatment without medical guidance, as this may lead to a recurrence of symptoms.
When using topical lactic acid, the most frequently reported side effects are localized to the site of application. These include:
Some patients may experience more pronounced reactions, including:
Rarely, more significant adverse events may occur:
While lactic acid is generally safe, certain reactions require urgent medical evaluation.
> Warning: Stop taking Lactic Acid and call your doctor immediately if you experience any of these.
Prolonged use of lactic acid, especially at higher concentrations, can lead to:
No FDA black box warnings currently exist for Lactic Acid. It is considered a low-risk medication when used as directed for its approved indications. However, this does not mean the drug is without risk; patients must adhere strictly to the prescribed concentration and application frequency to avoid severe chemical irritation.
Report any unusual symptoms or persistent irritation to your healthcare provider. Monitoring the skin's response during the first two weeks of treatment is particularly important for identifying sensitivity early.
Lactic acid is a potent chemical exfoliant and acidifier. It must be used with caution to avoid chemical burns or systemic imbalances. Patients should be aware that lactic acid is for external or specialized internal use only and should never be used in a manner not prescribed by a physician. It is vital to keep all lactic acid products out of the reach of children, as accidental ingestion can be toxic.
No FDA black box warnings for Lactic Acid. Unlike some more potent systemic medications, lactic acid has a long history of safe use, provided it is applied topically or administered intravenously under strict clinical protocols.
Topical or vaginal lactic acid does not typically affect the ability to drive or operate machinery. However, if systemic administration causes dizziness or confusion (due to pH changes), these activities should be avoided until the patient is stable.
There are no direct interactions between topical lactic acid and alcohol. However, for patients receiving systemic lactate, alcohol should be avoided as it can interfere with hepatic lactate metabolism and increase the risk of lactic acidosis.
There is no withdrawal syndrome associated with stopping lactic acid. However, for chronic conditions like ichthyosis, stopping treatment will likely result in a return of symptoms within a few days or weeks. If you experience severe irritation, you should stop use immediately and consult your doctor.
> Important: Discuss all your medical conditions, including any history of skin cancer or sensitive skin, with your healthcare provider before starting Lactic Acid.
While topical lactic acid has few systemic contraindications, it should never be used simultaneously with other highly caustic or abrasive treatments on the same skin area.
For topical use, there are no known food interactions. For systemic administration, high-carbohydrate meals can theoretically increase endogenous lactate production, but this is rarely clinically significant compared to the therapeutic dose being administered.
For each major interaction, the primary management strategy is to separate the application times or reduce the frequency of use. If severe irritation occurs, the healthcare provider may recommend a lower concentration of lactic acid.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, including over-the-counter skincare products, to ensure safe and effective treatment.
Lactic acid must NEVER be used in the following circumstances:
Conditions requiring careful risk-benefit analysis include:
Patients who are sensitive to other alpha-hydroxy acids (like glycolic or malic acid) are more likely to react to lactic acid. Additionally, because some lactic acid is derived from dairy fermentation, individuals with extreme dairy allergies should consult their doctor, although the purified acid typically does not contain milk proteins.
> Important: Your healthcare provider will evaluate your complete medical history, including any history of skin sensitivity or metabolic disorders, before prescribing Lactic Acid.
Lactic acid is classified as FDA Pregnancy Category C (under the old system). This means that animal reproduction studies have not been conducted, and there are no adequate and well-controlled studies in humans. However, topical lactic acid is generally considered safe during pregnancy because systemic absorption is negligible. It is often used to treat "mask of pregnancy" (melasma). Nevertheless, it should only be used if clearly needed and after discussion with an obstetrician. High-strength professional peels should be avoided during the third trimester.
It is not known whether topical lactic acid is excreted in human milk. However, due to the low systemic absorption, it is considered unlikely to pose a risk to the nursing infant. Mothers should avoid applying lactic acid creams directly to the breast or nipple area to prevent the infant from accidentally ingesting the medication or getting it in their eyes.
Lactic acid is approved for use in children (typically aged 2 and older) for conditions like ichthyosis. Pediatric skin is thinner and more absorbent than adult skin, so the risk of irritation is higher. Healthcare providers usually recommend starting with a lower concentration or once-daily application. It is not recommended for use in neonates or infants under 2 years old unless specifically directed by a specialist.
Clinical studies have not identified significant differences in response between elderly and younger patients. However, elderly patients are more likely to have dry, fragile skin and may be taking multiple other medications (polypharmacy). There is an increased risk of skin tearing if the acid causes excessive dryness. For systemic use, the risk of fluid overload or electrolyte imbalance is higher in the elderly due to age-related declines in heart and kidney function.
For topical use, renal impairment does not change the dosing. For systemic (IV) administration, the kidneys play a role in excreting a small portion of lactate and are vital for maintaining the acid-base balance that lactate therapy aims to correct. Patients with a GFR (Glomerular Filtration Rate) below 30 mL/min must be monitored extremely closely for signs of metabolic disturbance.
In patients with significant hepatic impairment (Child-Pugh Class B or C), the metabolism of lactate into bicarbonate is impaired. This can lead to the accumulation of lactate in the blood, potentially causing lactic acidosis—the very condition systemic lactate is sometimes used to treat. Therefore, systemic lactic acid/lactate is generally contraindicated or used only in life-saving situations in these patients.
> Important: Special populations require individualized medical assessment to ensure the benefits of Lactic Acid therapy outweigh the potential risks.
Lactic acid's pharmacology is multi-dimensional. Topically, it acts as a keratolytic by diminishing the cohesion between cells in the stratum corneum. It functions as a chelating agent that removes calcium from the cell adhesion structures (desmosomes), which triggers desquamation. In the vaginal vault, it acts as a pH-buffering agent, providing the hydrogen ions necessary to maintain an acidic environment that is hostile to anaerobic bacteria. Systemically, sodium lactate is a bicarbonate precursor; the oxidative metabolism of lactate in the liver consumes a hydrogen ion and produces bicarbonate, thereby increasing the blood's buffering capacity.
| Parameter | Value |
|---|---|
| Bioavailability | <5% (Topical); 100% (IV) |
| Protein Binding | Negligible |
| Half-life | 15–30 minutes (Systemic) |
| Tmax | 1–2 hours (Topical absorption, if any) |
| Metabolism | Hepatic (LDH enzyme) |
| Excretion | Renal (<5% as unchanged acid) |
Lactic acid belongs to the Alpha-Hydroxy Acid (AHA) therapeutic class. In the context of the provided EPCs, it is also categorized as a Nitrogen Binding Agent and Calculi Dissolution Agent, reflecting its chemical ability to interact with various ions and metabolic waste products in specialized clinical settings.
Common questions about Cornex
Lactic acid is primarily used to treat dry, scaly skin conditions such as ichthyosis and xerosis by acting as a powerful exfoliant and moisturizer. It is also frequently used in vaginal gels to restore healthy pH levels and treat bacterial vaginosis. In a hospital setting, it may be administered intravenously as sodium lactate to treat metabolic acidosis or as part of fluid resuscitation. Additionally, it is a common ingredient in professional-grade chemical peels to improve skin texture and reduce signs of aging. Your doctor will choose the specific form and strength based on whether you are treating a skin issue, a vaginal imbalance, or a systemic condition.
The most common side effects are localized to the area where the medication is applied and include stinging, burning, and redness. These sensations are usually mild and tend to decrease as your skin or vaginal tissues become accustomed to the treatment. Some patients also notice peeling or flaking of the skin, which is often a sign that the medication is working to remove dead skin cells. If these symptoms become severe, cause intense pain, or lead to blistering, you should stop using the product and contact your healthcare provider. Always perform a patch test if you have sensitive skin to ensure you can tolerate the concentration.
For topical or vaginal use of lactic acid, there is no known interaction with alcohol, and moderate consumption is generally considered safe. However, if you are receiving systemic lactic acid or sodium lactate in a hospital setting, alcohol should be strictly avoided. Alcohol can interfere with the liver's ability to metabolize lactate, which could lead to a dangerous buildup of acid in the blood known as lactic acidosis. Furthermore, alcohol can dehydrate the skin, potentially worsening the dryness that topical lactic acid is intended to treat. Always consult your doctor about alcohol use if you have underlying liver or kidney issues.
Topical lactic acid is generally considered safe for use during pregnancy because very little of the medication is absorbed into the bloodstream. Many dermatologists recommend it as a safe alternative to other skin treatments like retinoids for managing pregnancy-related skin changes. However, high-concentration professional chemical peels should be avoided unless deemed absolutely necessary by a doctor. There is limited data on the use of vaginal lactic acid gels during pregnancy, so you should consult your obstetrician before starting treatment. As with any medication during pregnancy, the benefits must be weighed against any potential risks to the developing fetus.
The time it takes to see results depends on the condition being treated. For simple dry skin, you may feel an improvement in skin softness within just a few days. For more chronic conditions like ichthyosis or keratosis pilaris, it typically takes 2 to 4 weeks of twice-daily application to see a significant reduction in scaling and bumps. Vaginal gels usually provide symptomatic relief from odor and irritation within 48 to 72 hours, though the full course of treatment must be completed. If you do not see any improvement after a month of consistent use, you should consult your healthcare provider to re-evaluate your treatment plan.
Yes, you can stop using topical or vaginal lactic acid suddenly without experiencing withdrawal symptoms. However, because lactic acid is often used to manage chronic skin conditions, stopping treatment will likely cause your symptoms to return. For example, the dryness and scaling of ichthyosis will usually reappear within a week of discontinuing the cream. If you are stopping because of skin irritation, your skin should begin to heal within a few days. If you were prescribed lactic acid for a specific infection like bacterial vaginosis, stopping early may lead to a relapse of the infection.
If you miss a dose of topical or vaginal lactic acid, apply it as soon as you remember. If it is nearly time for your next scheduled dose, skip the missed dose and continue with your regular schedule. Do not apply extra medication to make up for the missed dose, as this can increase the risk of skin irritation or chemical burns. For vaginal gels, missing a dose can delay the healing process, so try to stay as consistent as possible. If you miss several doses in a row, consult your doctor for advice on whether you need to restart the treatment course.
There is no evidence to suggest that lactic acid, whether used topically, vaginally, or intravenously, causes weight gain. It is not a hormonal medication and does not affect the body's metabolic rate or appetite in a way that would lead to fat accumulation. If you notice unusual swelling or rapid weight gain while receiving intravenous lactate, it may be a sign of fluid retention or an electrolyte imbalance, which should be reported to your medical team immediately. For the vast majority of patients using it for skin or vaginal health, weight changes are not a concern associated with this medication.
Lactic acid can interact with other topical medications, particularly other acids (like salicylic acid) or retinoids (like tretinoin). Using these together can cause severe skin irritation and should only be done under the guidance of a dermatologist. There are fewer concerns with systemic medications when using lactic acid topically, but you should always inform your doctor of all drugs you are taking. For intravenous use, lactic acid has several significant interactions with drugs that affect blood pH or electrolyte levels. Always provide a full list of your medications, including supplements, to your healthcare provider before starting any form of lactic acid.
Yes, lactic acid is widely available as a generic medication in various forms, including 12% lotions and creams. Generic versions are typically much more affordable than brand-name products like Lac-Hydrin and are required by the FDA to have the same active ingredient, strength, and efficacy. Many over-the-counter moisturizers also contain lower concentrations of lactic acid (usually 5% or less). For vaginal use and intravenous administration, generic options are also the standard in many clinical settings. Check with your pharmacist to see if a generic version is available for the specific formulation your doctor has prescribed.
Other drugs with the same active ingredient (Lactic Acid)