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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Other
Methylene Bis-benzotriazolyl Tetramethylbutylphenol is a broad-spectrum, hybrid UV filter used in advanced sunscreen formulations to provide high-level protection against both UVA and UVB radiation through absorption, scattering, and reflection.
Name
Methylene Bis-benzotriazolyl Tetramethylbutylphenol
Raw Name
METHYLENE BIS-BENZOTRIAZOLYL TETRAMETHYLBUTYLPHENOL
Category
Other
Drug Count
4
Variant Count
4
Last Verified
February 17, 2026
About Methylene Bis-benzotriazolyl Tetramethylbutylphenol
Methylene Bis-benzotriazolyl Tetramethylbutylphenol is a broad-spectrum, hybrid UV filter used in advanced sunscreen formulations to provide high-level protection against both UVA and UVB radiation through absorption, scattering, and reflection.
Detailed information about Methylene Bis-benzotriazolyl Tetramethylbutylphenol
References used for this content
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Methylene Bis-benzotriazolyl Tetramethylbutylphenol.
Methylene Bis-benzotriazolyl Tetramethylbutylphenol (commonly known by its trade name Tinosorb M or the INCI name Bisoctrizole) is a high-performance, broad-spectrum ultraviolet (UV) filter. It belongs to a unique class of 'hybrid' sunscreen agents, meaning it combines the characteristics of both organic (chemical) and inorganic (physical) filters. While most UV filters are either soluble organic molecules that absorb radiation or insoluble mineral particles (like zinc oxide) that reflect it, Methylene Bis-benzotriazolyl Tetramethylbutylphenol is an organic molecule that is processed into microfine, insoluble particles. This allows it to work through a triple mechanism: absorbing UV rays, scattering them, and reflecting them away from the skin surface.
In the context of pharmacological classification, it is categorized as a topical photoprotective agent. Unlike older UV filters that may target only a narrow band of radiation, this ingredient offers protection across the entire UV spectrum, including UVB (290–320 nm), UVA II (320–340 nm), and UVA I (340–400 nm). Its development represented a significant leap in dermatological science, addressing the need for photostable UVA protection, which is critical for preventing photoaging (premature skin aging caused by light) and long-term DNA damage that can lead to skin malignancies (cancers).
Regarding its regulatory and FDA approval history, the status of Methylene Bis-benzotriazolyl Tetramethylbutylphenol varies by region. It has been approved and widely used in the European Union (EU) since the late 1990s and is listed in Annex VI of the EU Cosmetics Regulation. It is also approved in Australia, Canada, and much of Asia. In the United States, it is currently categorized as a 'Time and Extent Application' (TEA) ingredient under the FDA’s Sunscreen Innovation Act. While it is found in many global formulations, its formal inclusion in the final OTC Sunscreen Monograph in the U.S. has been part of an ongoing review process where the FDA has requested additional long-term safety data common for all newer UV filters.
The mechanism of action for Methylene Bis-benzotriazolyl Tetramethylbutylphenol is what differentiates it from traditional sunscreens. At the molecular level, it contains benzotriazole groups that are highly efficient at capturing the energy from UV photons. When UV radiation hits the molecule, the electrons within the benzotriazole structure are promoted to a higher energy state (excited state). As these electrons return to their ground state, they release the energy as harmless heat, a process known as internal conversion. This prevents the radiation from penetrating the deeper layers of the epidermis and dermis where it could otherwise cause oxidative stress and cellular damage.
Because the ingredient is formulated as a microfine organic dispersion (particulate form), it also functions as a physical barrier. The particles are typically smaller than 200 nanometers, which is large enough to scatter and reflect light—similar to how titanium dioxide works—but small enough to remain transparent on the skin, avoiding the 'white cast' often associated with traditional mineral sunscreens. This triple-action profile (absorption, scattering, and reflection) makes it one of the most efficient UV filters available today. Furthermore, it is highly photostable, meaning it does not break down or lose its effectiveness when exposed to sunlight, a common flaw in older chemical filters like avobenzone.
Methylene Bis-benzotriazolyl Tetramethylbutylphenol is primarily indicated for the prevention of UV-induced skin damage. Its specific uses include:
This ingredient is never used alone but is incorporated as an active component in various topical vehicles:
> Important: Only your healthcare provider can determine if Methylene Bis-benzotriazolyl Tetramethylbutylphenol is right for your specific condition.
For Methylene Bis-benzotriazolyl Tetramethylbutylphenol-containing products, the 'dosage' is defined by the amount of topical application required to achieve the labeled Sun Protection Factor (SPF) and UVA protection. According to international dermatological standards (such as those from the American Academy of Dermatology and the European Academy of Dermatology and Venereology), the standard application rate is 2 milligrams per square centimeter (2 mg/cm²) of skin.
Because Methylene Bis-benzotriazolyl Tetramethylbutylphenol is not systemically absorbed and does not require renal clearance, no dosage adjustments are necessary for patients with chronic kidney disease or those on dialysis. The topical nature of the product ensures that it does not place a metabolic burden on the kidneys.
Similarly, since the ingredient does not undergo hepatic metabolism or enter the enterohepatic circulation, no adjustments are required for patients with liver cirrhosis or other forms of hepatic dysfunction.
No specific dosage adjustments are required for geriatric patients. However, since elderly skin may be thinner and more prone to dryness (xerosis), healthcare providers may recommend formulations containing Methylene Bis-benzotriazolyl Tetramethylbutylphenol that also include emollients and barrier-repairing lipids.
This ingredient is for external topical use only. It must never be ingested, injected, or applied to internal mucosal surfaces.
In the context of photoprotection, a 'missed dose' means a failure to apply or reapply sunscreen before sun exposure. If you forget to apply the product, apply it as soon as you remember. However, be aware that the skin may have already sustained UV damage during the unprotected interval. If you are already indoors and away from windows, a missed dose does not need to be 'made up.'
Systemic 'overdose' via topical application is virtually impossible due to the lack of absorption. However, 'over-application' can lead to localized skin issues such as clogged pores (comedogenicity) in sensitive individuals. If the product is accidentally ingested, contact a Poison Control Center immediately. While the UV filter itself has low acute oral toxicity, other ingredients in the formulation (like surfactants or alcohols) may cause gastrointestinal distress, nausea, or vomiting.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose without medical guidance.
Methylene Bis-benzotriazolyl Tetramethylbutylphenol is exceptionally well-tolerated compared to many older chemical UV filters. However, because it is often used in complex cosmetic formulations, some users may experience:
While extremely rare for this specific ingredient, systemic allergic reactions can occur with any topical product.
> Warning: Stop using products containing Methylene Bis-benzotriazolyl Tetramethylbutylphenol and call your doctor immediately if you experience any of these:
There is currently no clinical evidence suggesting that long-term use of Methylene Bis-benzotriazolyl Tetramethylbutylphenol leads to chronic health issues. Because it is not absorbed into the bloodstream, it does not accumulate in fatty tissues or organs. Furthermore, unlike some older filters (like oxybenzone), it has not demonstrated significant endocrine-disrupting activity in standardized biological assays. Long-term use is generally associated with a reduction in the risk of actinic keratosis and squamous cell carcinoma.
No FDA black box warnings have been issued for Methylene Bis-benzotriazolyl Tetramethylbutylphenol. It is not a scheduled drug and is generally recognized as safe for topical use in the jurisdictions where it is approved.
Report any unusual symptoms to your healthcare provider.
Methylene Bis-benzotriazolyl Tetramethylbutylphenol is intended for topical use only. Users must be cautioned that while sunscreens significantly reduce the risk of UV damage, they do not provide 100% protection. No sunscreen can completely block all UV radiation. Therefore, sunscreen should be used as one part of a comprehensive 'sun smart' strategy that includes wearing hats, sunglasses, and UV-protective clothing, and seeking shade during peak intensity hours (10 AM to 4 PM).
No FDA black box warnings for Methylene Bis-benzotriazolyl Tetramethylbutylphenol. This ingredient has a high safety margin and is not associated with the severe, life-threatening risks that warrant a black box designation.
There are no specific laboratory monitoring requirements (such as blood tests or organ function tests) for individuals using this ingredient. However, patients with a history of skin cancer or severe photosensitivity should have regular dermatological examinations (typically every 6 to 12 months) to monitor for new or changing skin lesions, regardless of sunscreen use.
There are no known effects on the ability to drive or operate heavy machinery. The ingredient does not cause drowsiness, visual impairment (unless directly in the eyes), or cognitive changes.
There is no known interaction between the topical use of this ingredient and the consumption of alcohol. However, alcohol consumption can sometimes lead to 'sunscreen neglect' (forgetting to reapply), which increases the risk of sunburn.
If a rash or irritation develops, use of the product should be discontinued immediately. There are no withdrawal symptoms or 'rebound' effects associated with stopping the use of UV filters. However, upon discontinuation, the skin will immediately lose its enhanced protection against UV radiation.
> Important: Discuss all your medical conditions with your healthcare provider before starting Methylene Bis-benzotriazolyl Tetramethylbutylphenol.
There are no known absolute contraindications for using Methylene Bis-benzotriazolyl Tetramethylbutylphenol with other medications. Because it is not systemically absorbed, it does not interfere with oral or intravenous drugs.
There are no known interactions with food, including grapefruit, dairy, or high-fat meals. The topical application route bypasses the digestive system entirely.
There are no documented interactions with herbal supplements such as St. John's Wort or Ginkgo Biloba. However, be aware that some supplements (like St. John's Wort) can cause systemic photosensitivity. If you are taking such supplements, the use of Methylene Bis-benzotriazolyl Tetramethylbutylphenol is even more critical to protect your skin.
Methylene Bis-benzotriazolyl Tetramethylbutylphenol does not interfere with standard blood chemistry, hematology, or urinalysis results. It does not affect the measurement of blood glucose, liver enzymes, or kidney function markers.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking.
There is little evidence of cross-sensitivity between Methylene Bis-benzotriazolyl Tetramethylbutylphenol and other classes of UV filters like PABA (para-aminobenzoic acid) or benzophenones. It is chemically distinct, making it a suitable alternative for patients who have reacted to older sunscreen ingredients.
> Important: Your healthcare provider will evaluate your complete medical history before prescribing Methylene Bis-benzotriazolyl Tetramethylbutylphenol.
Methylene Bis-benzotriazolyl Tetramethylbutylphenol is generally considered safe for use during pregnancy. Because it is not systemically absorbed, there is no mechanism for it to reach the developing fetus or cause teratogenic effects. In the EU and other regions, it is often recommended for pregnant women to help prevent 'melasma' (the mask of pregnancy), a condition where hormonal changes cause dark patches of skin that are worsened by UV exposure.
There is no evidence that Methylene Bis-benzotriazolyl Tetramethylbutylphenol passes into breast milk. Its high molecular weight and lack of skin penetration make it highly unlikely to be present in the systemic circulation of the mother. Nursing mothers should avoid applying the product directly to the nipple or areola area to prevent the infant from accidentally ingesting it during feeding.
As noted previously, it is approved for use in children over 6 months of age. It is often preferred in pediatric formulations because it is photostable and has a low potential for skin sensitization. It does not have the estrogenic concerns that have been raised (though not definitively proven) with some other chemical filters.
The elderly can safely use this ingredient. It is particularly beneficial for this population to prevent actinic keratosis and to protect skin that may be thinning due to age or the use of corticosteroid medications.
No adjustments or special precautions are needed for patients with kidney or liver disease due to the lack of systemic involvement.
> Important: Special populations require individualized medical assessment.
Methylene Bis-benzotriazolyl Tetramethylbutylphenol acts as a broad-spectrum UV absorber and scatterer. Its structure contains two benzotriazole chromophores linked by a methylene bridge. These chromophores are specifically 'tuned' to absorb the energy of UV light. When a photon is absorbed, the molecule undergoes an excited-state intramolecular proton transfer (ESIPT). This allows the molecule to dissipate the energy as heat extremely quickly, returning to its original state and ready to absorb another photon. Because it is an insoluble organic micro-particle, it also creates a physical surface that reflects and scatters light, particularly in the UVA and visible light ranges.
The pharmacodynamic effect—UV protection—is immediate upon application and drying of the film on the skin. The duration of effect is dependent on the integrity of the film; as the film is worn away by sweat, water, or physical contact, the protective effect diminishes. There is no evidence of pharmacological tolerance; the skin does not become 'used' to the filter in a way that reduces its efficacy over time.
| Parameter | Value |
|---|---|
| Bioavailability | < 0.1% (Negligible) |
| Protein Binding | N/A (No systemic entry) |
| Half-life | N/A (Not absorbed) |
| Tmax | N/A |
| Metabolism | None (Topical) |
| Excretion | Mechanical removal |
It is classified as an Organic/Hybrid UV Filter. Related medications in this functional class include Bemotrizinol (Tinosorb S) and Diethylamino Hydroxybenzoyl Hexyl Benzoate (Uvinul A Plus).
Common questions about Methylene Bis-benzotriazolyl Tetramethylbutylphenol
Methylene Bis-benzotriazolyl Tetramethylbutylphenol is a highly effective UV filter used in sunscreens to provide broad-spectrum protection against both UVA and UVB rays. It helps prevent sunburn, which is primarily caused by UVB radiation, and protects against long-term skin damage and premature aging caused by UVA rays. Because it is a 'hybrid' filter, it works by absorbing UV energy and scattering it away from the skin. It is frequently found in high-SPF formulations designed for sensitive skin or for individuals with conditions like melasma or lupus. By providing a stable barrier, it reduces the risk of skin cancer and helps maintain the skin's structural integrity over time. Always consult with a dermatologist to find the best sunscreen formulation for your specific skin type.
The most common side effects are generally mild and localized to the skin where the product was applied. Some users may notice a slight 'tacky' or 'heavy' feeling on the skin due to the particulate nature of the ingredient. Mild irritation, redness, or a slight stinging sensation may occur, particularly if the product is applied to sensitive or recently exfoliated skin. If the product accidentally gets into the eyes, it can cause temporary stinging and watering. Most of these effects resolve quickly once the product is washed off or the eyes are rinsed. It is considered one of the least irritating UV filters currently available in modern dermatology. If you experience persistent redness or a rash, you should stop using the product and speak with a healthcare provider.
Yes, you can consume alcohol while using products containing Methylene Bis-benzotriazolyl Tetramethylbutylphenol. Since this ingredient is applied topically to the skin and is not absorbed into the bloodstream, there is no risk of a chemical interaction with alcohol. However, it is important to remember that alcohol can impair your judgment and may lead you to forget to reapply your sunscreen as needed. Alcohol can also cause dehydration and may increase blood flow to the skin, which could potentially make a sunburn feel more painful if one occurs. For the best skin health, always stay hydrated and remain diligent with your sun protection routine regardless of alcohol consumption. If you have specific concerns about alcohol and your skin health, discuss them with your doctor.
Methylene Bis-benzotriazolyl Tetramethylbutylphenol is considered safe for use during pregnancy and while breastfeeding. Clinical data shows that the molecule is too large to penetrate the skin barrier, meaning it does not enter the mother's bloodstream or reach the developing fetus. Many dermatologists actually recommend the use of high-quality UVA filters like this one during pregnancy to help prevent melasma, a common skin condition characterized by dark patches that are triggered by sun exposure. It does not have the hormonal or endocrine-disrupting concerns that have been associated with some older, smaller-molecule UV filters. As with any product used during pregnancy, you should inform your obstetrician about your skincare routine. Always ensure that the other ingredients in your sunscreen, such as certain preservatives, are also considered safe for your situation.
Methylene Bis-benzotriazolyl Tetramethylbutylphenol begins working as soon as it is applied to the skin and forms a uniform film. However, most experts recommend waiting 15 to 20 minutes after application before going out into direct sunlight. This 'wait time' allows the liquid vehicle of the sunscreen to evaporate and the protective particles to settle into an even, durable layer on the skin's surface. If you go outside immediately after application, the wet product may be easily rubbed off by clothing or diluted by sweat, leaving areas of your skin unprotected. The protection is 'physical' and 'chemical' at the surface level, so it does not need to be absorbed into the skin to function. Consistent and even application is the key to ensuring the ingredient works as intended. Talk to your pharmacist if you have questions about the specific application instructions for your product.
Yes, you can stop using products containing Methylene Bis-benzotriazolyl Tetramethylbutylphenol at any time without experiencing withdrawal symptoms or physical side effects. Since it is a topical protective agent and not a systemic medication, your body does not develop a dependence on it. However, you should be aware that as soon as you stop applying the product, your skin will lose its enhanced protection against ultraviolet radiation. This means you will be at a higher risk for sunburn, photoaging, and long-term DNA damage if you continue to spend time in the sun. If you are stopping the product because of a suspected allergy, your skin should begin to clear up shortly after you cease application. If you have a medical condition like lupus that requires sun protection, consult your doctor before switching or stopping your UV protection regimen.
If you forget to apply your sunscreen before going outdoors, you should apply it as soon as you realize the omission. If you are already in the sun, seek shade immediately while you apply the product and wait for it to dry. A 'missed dose' in this context simply means your skin was temporarily vulnerable to UV damage. There is no need to apply 'double' the amount of product later to make up for the missed application; simply resume the standard application and reapplication schedule (every two hours). If you have already sustained a sunburn due to the missed application, treat the area with cool compresses and moisturizers, and keep the burned skin completely out of the sun until it has fully healed. Discuss any severe sunburns with a healthcare professional, especially if they involve blistering.
No, Methylene Bis-benzotriazolyl Tetramethylbutylphenol does not cause weight gain. Weight gain is typically a result of systemic changes in metabolism, hormones, or caloric intake, usually associated with medications that are ingested or injected and enter the bloodstream. Because this UV filter remains on the surface of the skin and is not absorbed systemically, it has no way to influence your body's metabolic processes, fat storage, or appetite. There are no clinical studies or patient reports linking the topical use of sunscreens to changes in body weight. If you are experiencing unexpected weight gain, it is likely due to other factors such as diet, lifestyle changes, or a different medical condition. You should consult with your primary care physician to determine the underlying cause of any significant changes in your weight.
Methylene Bis-benzotriazolyl Tetramethylbutylphenol is safe to use alongside almost all other medications. Because it is applied topically and does not enter the systemic circulation, it does not interact with oral medications like blood pressure pills, antibiotics, or antidepressants. It is also compatible with most other topical treatments, such as acne creams or anti-aging serums. In fact, it is often recommended to use this ingredient in conjunction with medications that increase sun sensitivity, such as doxycycline or tretinoin. However, to ensure maximum efficacy, you should apply your treatment medications first, allow them to absorb completely, and then apply the sunscreen as the final layer. If you are using a prescription-strength topical steroid, ask your doctor for specific instructions on the order of application.
Methylene Bis-benzotriazolyl Tetramethylbutylphenol is the name of the active chemical ingredient itself, rather than a brand name. In the world of sunscreens, 'generic' versions are typically marketed as store-brand sunscreens (like those found at CVS, Walgreens, or Walmart). You can check the 'Drug Facts' or 'Ingredients' label on the back of a sunscreen bottle to see if it contains this specific ingredient. While the trade name 'Tinosorb M' is owned by the manufacturer BASF, the chemical ingredient is used by many different brands in their formulations. Because it is a premium, high-performance filter, it is often found in 'dermatologist-recommended' or higher-end sunscreen lines. Its availability in the U.S. is currently limited to products marketed as cosmetics while the FDA continues its review. Always check the label for the full list of active ingredients.