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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Allantoin, Menthol
Brand Name
Terrasil Itch, Rash And Pain Relief
Generic Name
Allantoin, Menthol
Active Ingredient
AllantoinCategory
Standardized Chemical Allergen [EPC]
Variants
1
Different strengths and dosage forms
| Strength | Form | Route | NDC |
|---|---|---|---|
| .5 g/100g | OINTMENT | TOPICAL | 24909-159 |
Detailed information about Terrasil Itch, Rash And Pain Relief
This page is for informational purposes only and does not replace medical advice. Before using any prescription or over-the-counter medication for Terrasil Itch, Rash And Pain Relief, you must consult a qualified healthcare professional.
Allantoin is a potent keratolytic and skin-protectant agent used to treat skin irritation, promote wound healing, and serve as a standardized chemical allergen in diagnostic testing.
For the majority of FDA-approved indications involving skin protection and keratolysis, the standard adult dosage for Allantoin involves applying the product to the affected area as needed.
Allantoin is generally considered safe for pediatric use, particularly in the treatment of diaper dermatitis and minor skin abrasions.
Since topical Allantoin has minimal systemic absorption, dosage adjustments are generally not required for patients with renal impairment. However, if used on large areas of broken skin in patients with end-stage renal disease (ESRD), caution is advised due to the theoretical risk of nitrogenous compound accumulation.
No dosage adjustments are necessary for patients with liver disease, as Allantoin does not rely on hepatic metabolism for its primary clearance or therapeutic effect.
Elderly patients often have thinner, more fragile skin (atrophic skin). While no specific dose reduction is required, healthcare providers may recommend less frequent application or the use of more emollient-rich (ointment-based) formulations to prevent further mechanical irritation during application.
Allantoin is intended for external use only. Proper administration is key to maximizing its keratolytic and protective benefits:
If you miss a dose of Allantoin, apply it as soon as you remember. If it is almost time for your next application, skip the missed dose and resume your regular schedule. Do not apply double amounts to "catch up," as this may increase the risk of localized skin irritation.
Systemic overdose of topical Allantoin is extremely rare. However, ingestion of Allantoin-containing products can lead to gastrointestinal distress.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose or frequency of use without medical guidance, especially when treating chronic conditions like psoriasis or deep wounds.
Allantoin is widely recognized for its low toxicity and high tolerability. However, even "hypoallergenic" substances can cause reactions in sensitive individuals. Common side effects, particularly when used in high concentrations or in combination with other actives (like salicylic acid or urea), include:
Some patients may experience more pronounced reactions, often related to the inactive ingredients (preservatives or fragrances) in the Allantoin formulation:
Rarely, Allantoin can cause more significant dermatological issues:
While Allantoin itself is non-toxic, severe allergic reactions (anaphylaxis) can occur, particularly if the patient has a known sensitivity to the Standardized Chemical Allergen [EPC] profile of the drug.
> Warning: Stop taking Allantoin and call your doctor immediately if you experience any of these:
Prolonged use of Allantoin is generally considered safe and is often encouraged for chronic conditions like scar management. However, long-term use on very thin skin (such as the face or genitals) should be monitored by a healthcare provider to ensure the skin barrier remains healthy. There is no evidence that Allantoin causes skin thinning (atrophy) like topical corticosteroids; in fact, it is often used to help repair the skin barrier.
There are currently no FDA black box warnings for Allantoin. It is considered one of the safest dermatological ingredients available. However, patients should always check the labeling of combination products, as other ingredients (such as certain preservatives or high-strength acids) may carry their own specific warnings.
Report any unusual symptoms or worsening of your skin condition to your healthcare provider. If a rash develops and persists for more than 72 hours, discontinue use and seek medical advice.
Allantoin is for external use only. It must never be ingested, injected, or applied to the mucous membranes (such as inside the mouth or nose) unless specifically formulated for that purpose. Patients must be cautious to avoid contact with the eyes; if contact occurs, rinse thoroughly with cool water for several minutes.
No FDA black box warnings for Allantoin. Its safety profile is well-established for topical application in both OTC and prescription contexts.
Because Allantoin is used as a Standardized Chemical Allergen [EPC], it is known that a small subset of the population is sensitized to it. Patients with a history of multiple chemical sensitivities or "reactive skin" should perform a patch test on a small area of healthy skin (such as the inner forearm) for 24 to 48 hours before applying it to larger areas or broken skin.
According to FDA guidelines for skin protectants, Allantoin should not be used on:
Using Allantoin on these types of injuries without medical supervision can trap bacteria inside the wound or interfere with necessary surgical debridement.
Allantoin does not have primary antibacterial or antifungal properties. If the skin area being treated shows signs of infection (pus, foul odor, spreading warmth, or fever), Allantoin should not be used as a standalone treatment. A healthcare provider must prescribe an appropriate anti-infective agent.
For standard topical use, no routine laboratory monitoring (such as blood counts or liver function tests) is required. However, clinicians treating chronic conditions like psoriasis or extensive scarring should monitor:
Topical Allantoin does not cause sedation, dizziness, or visual impairment. It has no known effect on the ability to drive or operate heavy machinery.
There are no known direct interactions between topical Allantoin and alcohol consumption. However, alcohol can dehydrate the skin and exacerbate inflammatory skin conditions, potentially counteracting the hydrating benefits of Allantoin.
There is no "withdrawal syndrome" associated with Allantoin. You may stop using it at any time. However, for conditions like chronic dry skin or scar management, premature discontinuation may result in the return of symptoms or a slowing of the healing process. No tapering is required.
> Important: Discuss all your medical conditions, including any history of eczema or sensitive skin, with your healthcare provider before starting Allantoin.
There are no documented absolute contraindications for combining topical Allantoin with other medications. However, it should not be applied simultaneously with other topical products on the exact same area of skin unless directed by a doctor, as this can interfere with the absorption of both agents.
While often used together in clinical practice, Allantoin increases the permeability of the stratum corneum. This may lead to increased absorption of topical steroids (such as clobetasol or hydrocortisone), potentially increasing the risk of systemic steroid side effects like adrenal suppression. Healthcare providers should monitor for signs of skin thinning or systemic absorption when these are used in combination over large surface areas.
Allantoin is often used to soothe the irritation caused by retinoids. However, its keratolytic action may theoretically compound the exfoliation caused by retinoids. If excessive redness or peeling occurs, the frequency of one or both agents should be reduced.
Many OTC products combine Allantoin with other keratolytics. While effective for thick, scaly skin, the combination increases the risk of localized irritation and "over-exfoliation" of the skin barrier. Patients should be advised to monitor for increased sensitivity to sun and wind.
There are no known food interactions for topical Allantoin. Unlike certain systemic medications, Allantoin absorption is not affected by the consumption of grapefruit, dairy, or high-fat meals.
Patients using Allantoin-containing products should be cautious about using oral comfrey supplements or large amounts of comfrey tea. Comfrey contains pyrrolizidine alkaloids, which are hepatotoxic (toxic to the liver). While the Allantoin in the plant is safe, the alkaloids are not. Using topical Allantoin alongside oral comfrey may complicate the clinical picture if hepatic issues arise.
Allantoin is a nitrogenous compound. In rare cases where significant systemic absorption occurs (e.g., treatment of massive burns), it may theoretically interfere with Uric Acid Assays or BUN (Blood Urea Nitrogen) tests, leading to slightly elevated readings. However, this is not clinically significant for the vast majority of patients.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, including those applied to the skin.
Allantoin should NEVER be used in the following circumstances:
Conditions requiring careful risk-benefit analysis by a healthcare provider:
There is limited evidence of cross-sensitivity between Allantoin and other diureides. However, patients who are sensitive to Urea or Uric Acid derivatives should exercise caution. Additionally, because Allantoin is often derived from or associated with the Comfrey plant, patients with known botanical allergies to the Boraginaceae family should be monitored closely.
> Important: Your healthcare provider will evaluate your complete medical history, including any history of skin cancer or chronic infections, before prescribing or recommending Allantoin.
Allantoin is classified as Pregnancy Category C (or equivalent under newer labeling systems). There are no adequate and well-controlled studies of topical Allantoin in pregnant women. However, because systemic absorption is negligible when applied to intact skin, it is generally considered low-risk.
It is not known whether topical Allantoin is excreted in human milk. However, due to its low systemic bioavailability, it is unlikely to affect the nursing infant.
Allantoin is widely used and FDA-approved for pediatric patients, particularly for diaper rash and minor skin protection.
Clinical studies have not identified significant differences in responses between the elderly and younger patients.
No specific dosage adjustments are provided in the manufacturer's labeling. However, in patients with severe renal failure, avoid applying Allantoin to large areas of denuded skin where systemic absorption could theoretically contribute to the nitrogenous load the kidneys must process.
No adjustments are necessary. Allantoin's clearance is not dependent on hepatic function, making it safe for patients with cirrhosis or other liver diseases.
> Important: Special populations require individualized medical assessment. Always inform your doctor if you are pregnant, planning to become pregnant, or breastfeeding before starting new treatments.
Allantoin exerts its primary therapeutic effects through several pathways:
| Parameter | Value |
|---|---|
| Bioavailability | <5% (on intact skin) |
| Protein Binding | Negligible |
| Half-life | 1.5 - 2.5 hours (systemic) |
| Tmax | 1 - 2 hours (if absorbed) |
| Metabolism | Minimal (Not CYP dependent) |
| Excretion | Renal (>90% if systemic) |
Allantoin belongs to the therapeutic class of Dermatological Skin Protectants. Within the EPC framework, it is categorized as a Standardized Chemical Allergen, Nitrogen Binding Agent, and Adenosine Receptor Agonist. It is often grouped with other keratolytics like urea and salicylic acid, though it is significantly less irritating.
Common questions about Terrasil Itch, Rash And Pain Relief
Allantoin is primarily used as a skin protectant and keratolytic agent to treat various dermatological conditions. It is FDA-approved for the temporary relief of minor skin irritations, such as chafing, windburn, and minor cuts or scrapes. Additionally, it is a key ingredient in many scar-reduction gels because it promotes cell proliferation and healthy tissue regrowth. In clinical settings, it is also used as a standardized chemical allergen to help diagnose contact sensitivities through patch testing. Healthcare providers may also recommend it for chronic dry skin conditions like psoriasis or ichthyosis to help soften and remove scales.
The most common side effects of Allantoin are mild and localized to the site of application. These include a temporary stinging or burning sensation, slight redness, and a feeling of skin tightness. Most of these symptoms are transient and disappear shortly after the product is absorbed. Because Allantoin is known for its soothing properties, it is often added to other medications specifically to reduce their side effects. However, if you notice persistent itching or a worsening rash, you should discontinue use and consult a doctor. Serious allergic reactions are extremely rare but require immediate medical attention.
There are no known direct interactions between topical Allantoin and alcohol consumption. Because Allantoin is applied to the skin and very little enters the bloodstream, alcohol does not interfere with how the medication works. However, it is important to note that heavy alcohol consumption can dehydrate the skin and worsen inflammatory conditions like eczema or psoriasis. If you are using Allantoin to treat these conditions, limiting alcohol may help improve your overall skin health. Always follow the general health advice provided by your healthcare provider regarding alcohol and your specific medical condition.
Allantoin is generally considered safe for use during pregnancy, especially when applied to small areas of intact skin. It is classified as Pregnancy Category C, meaning while there are no exhaustive human trials, the lack of systemic absorption makes it a low-risk option. Most obstetricians allow the use of Allantoin-containing lotions for stretch marks or dry skin. However, it is always best to consult your healthcare provider before starting any new medication while pregnant. Avoid applying it to large areas of broken skin to ensure that systemic exposure remains as low as possible.
The time it takes for Allantoin to work depends on the condition being treated. For simple skin protection against windburn or chafing, the effects are almost immediate upon application. For more complex issues like wound healing or scar reduction, it may take 3 to 4 weeks of consistent use to see a visible difference in skin texture. Keratolytic effects, such as the softening of dry scales in psoriasis, usually become apparent within the first week. If your condition does not improve after 7 days of use, or if it worsens, you should contact your healthcare provider for a re-evaluation.
Yes, you can stop using Allantoin suddenly without any risk of withdrawal symptoms or physical dependence. It is not a systemic medication like a steroid or an antidepressant that requires a tapering period. However, if you are using Allantoin to manage a chronic condition like severely dry skin or a healing scar, stopping treatment abruptly may cause your symptoms to return. To maintain the benefits, it is often recommended to continue application until the skin has fully healed or as directed by your dermatologist. Talk to your doctor if you are unsure about the best time to discontinue treatment.
If you miss a dose of Allantoin, simply apply it as soon as you remember. If it is nearly time for your next scheduled application, skip the missed dose and continue with your regular routine. There is no need to apply extra cream or ointment to make up for a missed dose, as this will not speed up the healing process and may cause unnecessary irritation. Consistency is more important than the exact timing of each application for long-term skin health. Setting a reminder on your phone can help you maintain a regular schedule for chronic skin care.
No, Allantoin does not cause weight gain. It is a topical agent with negligible systemic absorption, meaning it does not enter the bloodstream in amounts large enough to affect your metabolism, appetite, or fat storage. Unlike systemic corticosteroids or certain hormonal medications, Allantoin has no known impact on body weight. If you experience unexpected weight gain while using Allantoin, it is likely due to another factor, such as a different medication or an underlying medical condition. You should discuss any significant weight changes with your healthcare provider.
Allantoin can generally be used alongside other medications, but some caution is needed with other topical treatments. Because Allantoin softens the skin, it can increase the absorption of other topical drugs, such as steroids or retinoids. This can be beneficial, but it may also increase the risk of side effects from those other drugs. It is best to wait at least 30 minutes between applying different topical products to ensure each is absorbed properly. Always provide your doctor with a full list of all medications you are using, including over-the-counter creams and herbal supplements.
Allantoin is widely available as a generic ingredient and is found in hundreds of different over-the-counter and prescription products. It is rarely sold as a standalone "Allantoin" brand but is instead the active ingredient in many skin protectants, scar gels, and diaper rash ointments. Generic versions are just as effective as brand-name products, provided they contain the same concentration of the active ingredient. You can check the 'Drug Facts' label on the packaging to confirm the amount of Allantoin present. Using generic formulations is often a cost-effective way to manage chronic skin conditions.
Other drugs with the same active ingredient (Allantoin)