Tretinoin (Microsphere) .8 mg/g Gel — NDC 68308-777-50 (Billing 68308-0777-50)
This is a package of Tretinoin (Microsphere) .8 mg/g Gel from Mayne Pharma, marketed since Oct 2024 and currently FDA-listed; retail pharmacies pay about $11.46 per g (NADAC). It is this product's only package size.
Identity & classification
Regulatory identifiers FDA, NLM and CMS codes for this package
Drug-database identifiers Medi-Span GPI and First Databank GCN / HICL / AHFS classification
- GSN (GCN sequence number): 072395
- GCN: 36604
- GPI-14 (Medi-Span): 90050030204020
- HICL (First Databank): 032888
- AHFS class code: 10:00.00.00
- RxCUI (RxNorm): 1488045
Where does this data come from?
- FDA openFDA NDC Directory · synced Oct 1, 2026
- FDA label on DailyMed · label index refreshed Oct 1, 2026
- RxNorm (NLM RxNav) · catalog refreshed Oct 1, 2026
- Medi-Span GPI (licensed)
- First Databank (licensed) · refreshed Oct 1, 2026
RxNorm drug class
This medicine belongs to the Retinoid class.
Where does this data come from?
- RxClass (NLM) · catalog refreshed Oct 1, 2026
Clinical
Tretinoin is used to treat acne. Tretinoin is also used to reduce fine wrinkles. Tretinoin is in a class of medications called retinoids. It works by increasing production of new skin cells and unclogging pores.
Read the full MedlinePlus article ↗- It depends on the form. Creams, gels and lotions treat acne, and Renova eases fine facial wrinkles. The capsules treat a blood cancer called acute promyelocytic leukemia.
- Wash the area, pat dry, and apply a thin layer once daily, usually in the evening. Keep it away from your eyes, mouth, nose creases and mucous membranes. More does not work faster...
- Mild warmth or stinging, redness and peeling are common. If it becomes severe, call your prescriber, who may have you use less or pause. Acne can seem to flare early on, which is n...
- What side effects should I expect on the skin?
Patient education
Supplement & herbal interactions
Some supplements/herbs that may interact with Tretinoin — tap one for details:
Tretinoin may be associated with lower levels of 1 nutrient — worth a chat with your pharmacist, not a cause for alarm.
Where does this data come from?
- MedlinePlus (NLM) · refreshed Oct 1, 2026
- FDA label on DailyMed · label index refreshed Oct 1, 2026
Ask a licensed pharmacist directly — free, answered by our team.
Pricing
A drug doesn't have one price. Each row is a different public payment system, and none is what you'd pay at the counter — that depends on your insurance. The ⓘ on each row explains what it measures.
| Price system | Per g | Per package |
|---|---|---|
| Retail pharmacies payNADAC · weekly | $11.465 | $573.23 / 50 g |
| Medicaid paysCMS SDUD · 12 mo | $9.55 | $477.27 / 50 g |
| Medicare drug plans payPart D · quarterly | No Part D plan price is available for this NDC in our data. | |
Where does this data come from?
- CMS NADAC weekly file · file of Sep 30, 2026
- CMS ASP pricing files · refreshed Sep 20, 2026
- CMS Medicaid State Drug Utilization Data · through Q1 2026
- CMS Part D plan pricing files · refreshed Sep 24, 2026
- VA National Acquisition Center price file
Packaging — all sizes for this product
| Package NDC | Description | Marketing start | Marketing end | Status |
|---|---|---|---|---|
| 68308-0777-50 You're viewing this Main listing | 1 BOTTLE, PUMP in 1 CARTON / 50 g in 1 BOTTLE, PUMP | 2024-10-25 | — | Active |
Therapeutic equivalents
| Product | Labeler | Pack | NADAC/unit | TE | Status | Price vs. this |
|---|---|---|---|---|---|---|
| Tretinoin .8 mg/g 21922-0043-40 | Encube | 1 bottle | $11.465 | AB | Availability likely | — |
| Tretinoin (Microsphere) .8 mg/gthis 68308-0777-50 | Mayne | 1 bottle | $11.465 | AB | Availability likely | — |
| Retin-A MICRO .8 mg/g 00187-5148-02 | Bausch | 24 tubes | — | — | FDA listed | — |
| Tretinoin .8 mg/g 68682-0515-95 | Oceanside | 1 bottle | — | — | FDA listed | — |
| Tretinoin .8 mg/g 69238-2323-01 | Amneal | 1 bottle | — | AB | FDA listed | — |
| Tretinoin .8 mg/g 72162-2303-02 | Bryant | 1 bottle | — | AB | FDA listed | — |
Where does this data come from?
- FDA openFDA NDC Directory · synced Oct 1, 2026
- FDA Orange Book · refreshed Sep 3, 2026
- CMS NADAC weekly file · file of Sep 30, 2026
Availability & generic status
This product is an FDA-approved generic. Other versions of the same drug are listed under Therapeutic equivalents, least expensive first.
Where does this data come from?
- FDA Orange Book · refreshed Sep 3, 2026
Inactive Ingredients / Excipients
Inactive ingredients, also called excipients, are components of the drug product other than the active ingredient. They may include fillers, dyes, coatings, preservatives, flavors, or other formulation ingredients.
💡 Tap an ingredient (hover on desktop) to see what it is and why it’s used.
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UNII LKG8494WBH
Benzyl alcohol is a clear liquid used as a preservative and solvent in medicines. It helps prevent bacterial and fungal growth and dissolves other ingredients to create uniform liquid formulations.
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UNII 1P9D0Z171K
BHT is a synthetic antioxidant that prevents fats and oils in medicines from breaking down and becoming rancid. It helps keep the product stable and effective during storage.
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UNII HHT01ZNK31
Carbomer Homopolymer Type B is a synthetic polymer made from acrylic acid. It absorbs water and forms a gel, so it's used in medicines as a thickener, suspending agent, and to help create a smooth texture in creams, gels, and lotions.
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UNII NMQ347994Z
Cyclomethicone is a silicone-based fluid that acts as a lubricant and solvent in medicines. It helps products flow smoothly, reduces friction between particles, and aids in even distribution of active ingredients.
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UNII 7FLD91C86K
Edetate disodium is a chemical compound that binds and removes certain metal ions. In medicines, it acts as a preservative and stabilizer by preventing metals like calcium from interfering with the product's shelf life and consistency.
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UNII PDC6A3C0OX
Glycerin is a clear, thick liquid derived from plant oils or fats. It acts as a humectant to retain moisture, a sweetener, and a solvent in medications.
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UNII 0057334FAB
A synthetic compound derived from glucose that combines water-repelling and water-attracting properties. It works as an emulsifier to help blend oil and water-based ingredients, and may also function as a thickener in creams and lotions.
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UNII 6DC9Q167V3
Propylene glycol is a clear liquid derived from petroleum or vegetable sources. It acts as a solvent, humectant, and preservative in medicines, helping dissolve active ingredients and maintain product stability.
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UNII X045WJ989B
Sorbic acid is a preservative derived from berries that prevents mold, yeast, and bacterial growth in medicines. It keeps the product stable and safe during storage.
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UNII 9O3K93S3TK
Trolamine is an alkaline compound used as a pH buffer and emulsifier in medicines. It helps neutralize acids, stabilize formulations, and enable mixing of oil and water-based ingredients.
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UNII 059QF0KO0R
Water is a liquid solvent that dissolves and mixes ingredients together in liquid medicines, syrups, and injections. It helps distribute the active drug evenly throughout the product.
11 inactive ingredients listed in the exact product block matched to this NDC.
Where does this data come from?
ingredient classCode="IACT" elements from the exact product block matched by this NDC. Label-section narrative from DailyMed / the openFDA label index is shown separately when available.- FDA label on DailyMed · label index refreshed Oct 1, 2026
- FDA openFDA NDC Directory · synced Oct 1, 2026
Inactive ingredient FAQ
Are inactive ingredients the same for every manufacturer?
Why might an inactive ingredient be missing?
Can inactive ingredients matter?
Manufacturer & labeler
Where does this data come from?
- FDA openFDA NDC Directory · synced Oct 1, 2026
- Drugs@FDA
Full prescribing information FDA SPL
🎯 Indications and Usage ▾
1 INDICATIONS AND USAGE Tretinoin gel (microsphere) is a retinoid indicated for topical application in the treatment of acne vulgaris. Tretinoin gel (microsphere) is a retinoid, indicated for topical treatment of acne vulgaris. ( 1 )
⏱️ Dosage and Administration ▾
2 DOSAGE AND ADMINISTRATION For topical use only. Not for ophthalmic, oral, or intravaginal use. Tretinoin gel (microsphere) should be applied once a day, in the evening, to the skin where acne lesions appear, using enough to cover the entire affected area in a thin layer.
Areas to be treated should be cleansed thoroughly before the medication is applied. If medication is applied excessively, no more rapid or better results will be obtained and marked redness, peeling, or discomfort may occur. A transitory feeling of warmth or slight stinging may be noted on application.
In cases where it has been necessary to temporarily discontinue therapy or to reduce the frequency of application, therapy may be resumed or the frequency of application increased as the patient becomes able to tolerate the treatment. Frequency of application should be closely monitored by careful observation of the clinical therapeutic response and skin tolerance. Efficacy has not been established for less than once daily dosing frequencies.
During the early weeks of therapy, an apparent exacerbation of inflammatory lesions may occur. If tolerated, this should not be considered a reason to discontinue therapy [see Adverse Reactions (6.1) ]. Therapeutic results may be noticed after two weeks, but more than seven weeks of therapy are required before consistent beneficial effects are observed.
Tretinoin gel (microsphere) should be kept away from the eyes, the mouth, paranasal creases of the nose, and mucous membranes. Patients treated with tretinoin gel (microsphere) may use cosmetics. Concomitant topical medication, medicated or abrasive soaps and cleansers, products that have a strong drying effect, products with high concentrations of alcohol, astringents, or spices should be used with caution because of possible interaction with tretinoin.
Avoid contact with the peel of limes. Particular caution should be exercised with the concomitant use of topical over-the-counter acne preparations containing benzoyl peroxide, sulfur, resorcinol, or salicylic acid with tretinoin gel (microsphere). It also is advisable to allow the effects of such preparations to subside before use of tretinoin gel (microsphere) is begun.
Apply a thin layer of tretinoin gel (microsphere) once daily, before bedtime, to skin where lesions occur. Keep away from eyes, mouth, nasal creases, and mucous membranes. ( 2 ) Not for oral, ophthalmic, or intravaginal use.
( 2 )
💊 Dosage Forms and Strengths ▾
3 DOSAGE FORMS AND STRENGTHS Tretinoin gel (microsphere) is a white to very pale yellow opaque gel. Tretinoin gel (microsphere) is available in strength: 0.08%. Each gram of tretinoin gel (microsphere), 0.08%, contains 0.8 mg of tretinoin. Gel, 0.08% ( 3 )
⛔ Contraindications ▾
4 CONTRAINDICATIONS None. None. ( 4 )
⚠️ Warnings and Cautions ▾
5 WARNINGS AND PRECAUTIONS Tretinoin gel (microsphere) should not be used on eczematous or sunburned skin due to potential for severe irritation. ( 5.1 , 5.2 ) Avoid unprotected exposure to sunlight including sunlamps (UV light), when using tretinoin gel (microsphere) due to potential for increased photosensitization. Use sunscreen of at least SPF 15 and protective clothing during exposure.
( 5.2 ) Avoid use of tretinoin gel (microsphere) with weather extremes, such as wind or cold due to potential for increased irritation. ( 5.2 )
5.1Local Irritation The skin of certain individuals may become excessively dry, red, swollen, or blistered. Tretinoin has been reported to cause severe irritation on eczematous skin and should be used with utmost caution in patients with this condition. If the degree of irritation warrants, patients should be directed to temporarily reduce the amount or frequency of application of the medication, discontinue use temporarily, or discontinue use all together.
Efficacy at reduced frequencies of application has not been established. If a reaction suggesting sensitivity occurs, use of the medication should be discontinued. To help limit skin irritation, patients must wash the treated skin gently, using a mild, non-medicated soap, and pat it dry, and avoid washing the treated skin too often or scrubbing it hard when washing.
Patients should apply a topical moisturizer if dryness is bothersome.
5.2Exposure to Ultraviolet Light or Weather Extremes Unprotected exposure to sunlight, including sunlamps (UV light) should be avoided or minimized during the use of tretinoin gel (microsphere) and patients with sunburn should be advised not to use the product until fully recovered because of heightened susceptibility to sunlight as a result of the use of tretinoin. Patients who may be required to have extended periods of UV exposure (e.g., due to occupation or sports), or those with inherent sensitivity to the sun, or those using medications that cause photosensitivity, should exercise particular caution.
Use of sunscreen products (SPF 15 or higher) and protective clothing over treated areas are recommended when exposure cannot be avoided [see Nonclinical Toxicology (13.1) ]. Weather extremes, such as wind or cold, also may be irritating to tretinoin-treated skin.
🤒 Adverse Reactions ▾
6 ADVERSE REACTIONS Most common adverse reactions are skin pain, pruritus, skin irritation/subcutaneous irritation, pharyngitis, and erythema. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Encube Ethicals Private Limited at 1-833-285-4151 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch
6.1Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. Clinical Trials in Subjects with Acne In separate clinical trials for each concentration, acne subjects treated with tretinoin gel (microsphere), 0.1% or 0.04%, over the twelve- week period showed that cutaneous irritation scores for erythema, peeling, dryness, burning/stinging, or itching peaked during the initial two weeks of therapy, decreasing thereafter.
Approximately half of the subjects treated with tretinoin gel (microsphere), 0.04%, had cutaneous irritation at Week 2. Of those subjects who did experience cutaneous side effects, most had signs or symptoms that were mild in severity (severity was ranked on a 4-point ordinal scale: 0=none, 1=mild, 2=moderate, and 3=severe). Less than 10% of patients experienced moderate cutaneous irritation and there was no severe irritation at Week 2.
In trials of tretinoin gel (microsphere), 0.04%, throughout the treatment period the majority of subjects experienced some degree of irritation (mild, moderate, or severe) with 1% (2/225) of subjects having scores indicative of a severe irritation; 1.3% (3/225) of subjects treated with tretinoin gel (microsphere), 0.04%, discontinued treatment due to irritation, which included dryness in one patient and peeling and urticaria in another. In trials of tretinoin gel (microsphere), 0.1%, no more than 3% of subjects had cutaneous irritation scores indicative of severe irritation; 6% (14/224) of subjects treated with tretinoin gel (microsphere), 0.1%, discontinued treatment due to irritation.
Of these 14 subjects, four had severe irritation after 3 to 5 days of treatment, with blistering in one subject. In a double-blind trial with 156 acne subjects comparing 12 weeks of treatment with tretinoin gel (microsphere), 0.04% or 0.1%, (78 subjects each group), the most frequently-reported adverse events affected the skin and subcutaneous tissue (15.4% in the 0.04% group, and 20.5% in the 0.1% group). The most prevalent of the dermatologic adverse events in the 0.04% group was skin irritation (6.4%); and in the 0.1% group skin burning (7.7%), erythema (5.1%), skin irritation (3.8%), and dermatitis (3.8%).
Most adverse events were of mild intensity (63.4%), and 34.4% were moderate. One subject in each group had adverse events characterized as severe, neither were dermatologic findings and neither was characterized as related to drug by the investigator. Trials in Subjects without Acne In a half-face comparison trial conducted for up to 14 days in women with sensitive skin, but without acne, tretinoin gel (microsphere), 0.1%, was statistically less irritating than tretinoin cream, 0.1%.
In addition, a cumulative 21- day irritation evaluation in subjects with normal skin showed that tretinoin gel (microsphere), 0.1%, had a lower irritation profile than tretinoin cream, 0.1%. The clinical significance of these irritation studies for patients with acne is not established. Comparable effectiveness of tretinoin gel (microsphere), 0.1%, and tretinoin cream, 0.1%, has not been established.
The lower irritancy of tretinoin gel (microsphere), 0.1%, in subjects without acne may be attributable to the properties of its vehicle. The contribution of decreased irritancy by the acrylate copolymer microsphere system has not been established. No irritation trials have been performed to compare tretinoin gel (microsphere), 0.04%, with either tretinoin gel (microsphere), 0.1%, or tretinoin cr… [Excerpted — this section continues on DailyMed.]
👥 Use in Specific Populations ▾
8 USE IN SPECIFIC POPULATIONS Tretinoin gel (microsphere) should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus. There are no adequate and well-controlled studies in pregnant and nursing women. ( 8.1 )
8.1Pregnancy Pregnancy Category C There are no adequate and well-controlled studies in pregnant women. Tretinoin gel (microsphere) should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus. Thirty human cases of temporally associated congenital malformations have been reported during two decades of clinical use of tretinoin products.
Although no definite pattern of teratogenicity and no causal association has been established from these cases, five of the reports describe the rare birth defect category holoprosencephaly (defects associated with incomplete midline development of the forebrain). The significance of these spontaneous reports in terms of risk to the fetus is not known. For purposes of comparison of the animal exposure to systemic human exposure, the MRHD applied topically is defined as 1 gram of tretinoin gel (microsphere), 0.1%, applied daily to a 60 kg person (0.017 mg tretinoin/kg body weight).
Pregnant rats were treated with tretinoin gel (microsphere), 0.1%, at daily dermal doses of 0.5 to 1.0 mg/kg/day tretinoin on gestation days 6-15. Alterations were seen in vertebrae and ribs of offspring at 5 to 10 times the MRHD based on the body surface area (BSA) comparison. Pregnant New Zealand White rabbits were treated with tretinoin gel (microsphere), 0.1%, at daily dermal doses of 0.2, 0.5, and 1.0 mg/kg/day tretinoin on gestation days 7-19.
Doses were administered topically for 24 hours a day while wearing Elizabethan collars to prevent ingestion of the drug. Increased incidences of certain alterations, including domed head and hydrocephaly, typical of retinoid-induced fetal malformations in this species, were observed at 0.5 and 1.0 mg/kg/day. Similar malformations were not observed at 0.2 mg/kg/day, 4 times the MRHD based on BSA comparison.
Other pregnant rabbits exposed topically for six hours per day to 0.5 or 1.0 mg/kg/day tretinoin while restrained in stocks to prevent ingestion, did not show any malformations at doses up to 19 times (1.0 mg/kg/day) the MRHD based on BSA comparison, but fetal resorptions were increased at 0.5 mg/kg (10 times the MRHD based on BSA comparison). Oral tretinoin has been shown to cause malformations in rats, mice, rabbits, hamsters, and nonhuman primates. Tretinoin induced fetal malformations in Wistar rats when given orally at doses greater than 1 mg/kg/day (10 times the MRHD based on BSA comparison).
In the cynomolgus monkey, fetal malformations were reported for doses of 10 mg/kg/day but none were observed at 5 mg/kg/day (95 times the MRHD based on BSA comparison), although increased skeletal variations were observed at all doses. Dose-related increases in embryolethality and abortion also were reported. Similar results have also been reported in pigtail macaques.
In oral peri- and postnatal development studies in rats with tretinoin, decreased survival of neonates and growth retardation were observed at doses in excess of 2 mg/kg/day (19 times the MRHD based on BSA comparison). Nonteratogenic effects on fetus Oral tretinoin has been shown to be fetotoxic in rats when administered at doses 24 times the MRHD based on BSA comparison. Topical tretinoin has been shown to be fetotoxic in rabbits when administered at doses 10 times the MRHD based on BSA comparison.
8.3Nursing Mothers It is not known whether tretinoin and/or its metabolites are excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when tretinoin gel (microsphere) is administered to a nursing woman.
8.4Pediatric Use Safety and effectiveness in children below the age of 12 have not been established.
8.5Geriatric Use Safety and effectiveness in a geriatric population have not b… [Excerpted — this section continues on DailyMed.]
🤰 Pregnancy ▾
8.1Pregnancy Pregnancy Category C There are no adequate and well-controlled studies in pregnant women. Tretinoin gel (microsphere) should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus. Thirty human cases of temporally associated congenital malformations have been reported during two decades of clinical use of tretinoin products.
Although no definite pattern of teratogenicity and no causal association has been established from these cases, five of the reports describe the rare birth defect category holoprosencephaly (defects associated with incomplete midline development of the forebrain). The significance of these spontaneous reports in terms of risk to the fetus is not known. For purposes of comparison of the animal exposure to systemic human exposure, the MRHD applied topically is defined as 1 gram of tretinoin gel (microsphere), 0.1%, applied daily to a 60 kg person (0.017 mg tretinoin/kg body weight).
Pregnant rats were treated with tretinoin gel (microsphere), 0.1%, at daily dermal doses of 0.5 to 1.0 mg/kg/day tretinoin on gestation days 6-15. Alterations were seen in vertebrae and ribs of offspring at 5 to 10 times the MRHD based on the body surface area (BSA) comparison. Pregnant New Zealand White rabbits were treated with tretinoin gel (microsphere), 0.1%, at daily dermal doses of 0.2, 0.5, and 1.0 mg/kg/day tretinoin on gestation days 7-19.
Doses were administered topically for 24 hours a day while wearing Elizabethan collars to prevent ingestion of the drug. Increased incidences of certain alterations, including domed head and hydrocephaly, typical of retinoid-induced fetal malformations in this species, were observed at 0.5 and 1.0 mg/kg/day. Similar malformations were not observed at 0.2 mg/kg/day, 4 times the MRHD based on BSA comparison.
Other pregnant rabbits exposed topically for six hours per day to 0.5 or 1.0 mg/kg/day tretinoin while restrained in stocks to prevent ingestion, did not show any malformations at doses up to 19 times (1.0 mg/kg/day) the MRHD based on BSA comparison, but fetal resorptions were increased at 0.5 mg/kg (10 times the MRHD based on BSA comparison). Oral tretinoin has been shown to cause malformations in rats, mice, rabbits, hamsters, and nonhuman primates. Tretinoin induced fetal malformations in Wistar rats when given orally at doses greater than 1 mg/kg/day (10 times the MRHD based on BSA comparison).
In the cynomolgus monkey, fetal malformations were reported for doses of 10 mg/kg/day but none were observed at 5 mg/kg/day (95 times the MRHD based on BSA comparison), although increased skeletal variations were observed at all doses. Dose-related increases in embryolethality and abortion also were reported. Similar results have also been reported in pigtail macaques.
In oral peri- and postnatal development studies in rats with tretinoin, decreased survival of neonates and growth retardation were observed at doses in excess of 2 mg/kg/day (19 times the MRHD based on BSA comparison). Nonteratogenic effects on fetus Oral tretinoin has been shown to be fetotoxic in rats when administered at doses 24 times the MRHD based on BSA comparison. Topical tretinoin has been shown to be fetotoxic in rabbits when administered at doses 10 times the MRHD based on BSA comparison.
🧒 Pediatric Use ▾
8.4Pediatric Use Safety and effectiveness in children below the age of 12 have not been established.
🧓 Geriatric Use ▾
8.5Geriatric Use Safety and effectiveness in a geriatric population have not been established. Clinical trials of tretinoin gel (microsphere), 0.1% and 0.04%, did not include sufficient numbers of subjects aged 65 and over to determine whether they responded differently from younger subjects.
🆘 Overdosage ▾
10 OVERDOSAGE Oral ingestion of large amounts of the drug may lead to the same side effects as those associated with excessive oral intake of Vitamin A.
🧬 Clinical Pharmacology ▾
12 CLINICAL PHARMACOLOGY
12.1Mechanism of Action Although tretinoin activates three members of the retinoic acid (RAR) nuclear receptors (RARα, RARβ, and RARγ) which may act to modify gene expression, subsequent protein synthesis, and epithelial cell growth and differentiation, it has not been established whether the clinical effects of tretinoin are mediated through activation of retinoic acid receptors and/or other mechanisms. The exact mode of action of tretinoin is unknown. Current evidence suggests that topical tretinoin decreases cohesiveness of follicular epithelial cells with decreased microcomedone formation.
Additionally, tretinoin stimulates mitotic activity and increased turnover of follicular epithelial cells causing extrusion of the comedones.
12.3Pharmacokinetics Tretinoin is a metabolite of Vitamin A metabolism in man. Percutaneous absorption, as determined by the cumulative excretion of radiolabeled drug into urine and feces, was assessed in 44 healthy men and women after single and repeated daily applications of 500 mg of a 0.1% tretinoin gel formulation. Estimates of in vivo bioavailability, mean (SD) %, following both single and multiple daily applications, for a period of 28 days with the 0.1% gel, were 0.82 (0.11)% and 1.41 (0.54)%, respectively.
The plasma concentrations of tretinoin and its metabolites, 13- cis -retinoic acid, all- trans -4-oxo-retinoic acid, and 13- cis -4-oxo-retinoic acid, generally ranged from 1 to 3 ng/mL and were essentially unaltered after either single or multiple daily applications of tretinoin gel (microsphere), 0.1%, relative to baseline levels. Clinical pharmacokinetic studies have not been performed with tretinoin gel (microsphere), 0.08%, 0.06% and 0.04%.
🧬 Mechanism of Action ▾
12.1Mechanism of Action Although tretinoin activates three members of the retinoic acid (RAR) nuclear receptors (RARα, RARβ, and RARγ) which may act to modify gene expression, subsequent protein synthesis, and epithelial cell growth and differentiation, it has not been established whether the clinical effects of tretinoin are mediated through activation of retinoic acid receptors and/or other mechanisms. The exact mode of action of tretinoin is unknown. Current evidence suggests that topical tretinoin decreases cohesiveness of follicular epithelial cells with decreased microcomedone formation.
Additionally, tretinoin stimulates mitotic activity and increased turnover of follicular epithelial cells causing extrusion of the comedones.
📦 How Supplied / Storage and Handling ▾
16 HOW SUPPLIED/STORAGE AND HANDLING
16.1How Supplied Tretinoin gel (microsphere) is opaque and white to very pale yellow in color. Tretinoin gel (microsphere), 0.08%, is supplied in 50 gram pump (NDC 68308-777-50).
16.2Storage Conditions Store at 20° to 25°C (68° to 77°F); excursions permitted from 15° to 30°C (59° to 86°F) [see USP Controlled Room Temperature]. Store pump upright. Keep out of reach of children.
📦 Storage and Handling ▾
16.2Storage Conditions Store at 20° to 25°C (68° to 77°F); excursions permitted from 15° to 30°C (59° to 86°F) [see USP Controlled Room Temperature]. Store pump upright. Keep out of reach of children.
📋 Description ▾
11 DESCRIPTION Tretinoin gel (microsphere), 0.08%, is a white to very pale yellow opaque gel for topical treatment of acne vulgaris. Chemically, tretinoin is all-trans-retinoic acid, also known as (all-E)-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4,6,8-nonatetraenoic acid. It is a member of the retinoid class of compounds and a metabolite of naturally occurring Vitamin A.
Tretinoin has a molecular weight of 300.44, a molecular formula of C 20 H 28 O 2 and the following chemical structure: Each gram of tretinoin gel (microsphere), 0.08%, contains 0.8 mg of tretinoin. The formulation uses acrylate copolymer microsphere system to enable inclusion of the active ingredient, tretinoin, in an aqueous gel. Other components consist of benzyl alcohol, butylated hydroxytoluene, carbomer 974P, cyclomethicone and dimethicone copolyol, disodium EDTA, glycerin, PPG-20 methyl glucose ether distearate, propylene glycol, propylene glycol dicaprylate/dicaprate, purified water, sorbic acid, and trolamine.
Chemical Structure
💬 Information for Patients ▾
17 PATIENT COUNSELING INFORMATION Advise the patient to read the FDA-approved patient labeling (Patient Information). The patient should be instructed to: Cleanse the treatment area thoroughly, before treatment, with a mild, non-medicated cleanser. Do not use more than the recommended amount and do not apply tretinoin gel (microsphere) more than once daily as this will not produce faster or better results, but may increase irritation.
Minimize exposure to sunlight, including sunlamps. Recommend the use of sunscreen products and protective apparel (e.g., hat) when exposure cannot be avoided. Made in Italy, formulated in India.
🍼 Nursing Mothers ▾
8.3Nursing Mothers It is not known whether tretinoin and/or its metabolites are excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when tretinoin gel (microsphere) is administered to a nursing woman.
🧬 Pharmacokinetics ▾
12.3Pharmacokinetics Tretinoin is a metabolite of Vitamin A metabolism in man. Percutaneous absorption, as determined by the cumulative excretion of radiolabeled drug into urine and feces, was assessed in 44 healthy men and women after single and repeated daily applications of 500 mg of a 0.1% tretinoin gel formulation. Estimates of in vivo bioavailability, mean (SD) %, following both single and multiple daily applications, for a period of 28 days with the 0.1% gel, were 0.82 (0.11)% and 1.41 (0.54)%, respectively.
The plasma concentrations of tretinoin and its metabolites, 13- cis -retinoic acid, all- trans -4-oxo-retinoic acid, and 13- cis -4-oxo-retinoic acid, generally ranged from 1 to 3 ng/mL and were essentially unaltered after either single or multiple daily applications of tretinoin gel (microsphere), 0.1%, relative to baseline levels. Clinical pharmacokinetic studies have not been performed with tretinoin gel (microsphere), 0.08%, 0.06% and 0.04%.
🔬 Clinical Studies ▾
14 CLINICAL STUDIES
14.1Tretinoin gel (microsphere), 0.1% In two vehicle-controlled trials, tretinoin gel (microsphere), 0.1%, applied once daily was significantly more effective than vehicle in reducing the acne lesion counts. The mean reductions in lesion counts from baseline after treatment for 12 weeks are shown in the following table : Table 1: Mean Percent Reduction in Lesion Counts Tretinoin gel (microsphere), 0.1% Tretinoin gel (microsphere), 0.1% Vehicle Gel Study #1 72 pts Study #2 71 pts Study #1 72 pts Study #2 67 pts Non-inflammatory lesion counts 49% 32% 22% 3% Inflammatory lesion counts 37% 29% 18% 24% Total lesion counts 45% 32% 23% 16% Tretinoin gel (microsphere), 0.1%, was also significantly superior to the vehicle in the investigator's global evaluation of the clinical response.
In Study #1, thirty-five percent (35%) of subjects using tretinoin gel (microsphere), 0.1%, achieved an excellent result, as compared to eleven percent (11%) of subjects on the vehicle control. In Study #2, twenty-eight percent (28%) of patients using tretinoin gel (microsphere), 0.1%, achieved an excellent result, as compared to nine percent (9%) of the subjects on the vehicle control.
14.2Tretinoin gel (microsphere), 0.04% In two vehicle-controlled clinical trials, tretinoin gel (microsphere), 0.04%, applied once daily, was more effective (p<0.05) than vehicle in reducing the acne lesion counts. The mean reductions in lesion counts from baseline after treatment for 12 weeks are shown in the following table: Table 2: Mean Percent Reduction in Lesion Counts Tretinoin gel (microsphere), 0.04% Tretinoin gel (microsphere), 0.04% Vehicle Gel Study #3 108 pts Study #4 111 pts Study #3 110 pts Study #4 103 pts Non-inflammatory lesion counts 37% 29% −2% - That is, a mean percent increase of 2% 14% Inflammatory lesion counts 44% 41% 13% 30% Total lesion counts 40% 35% 8% 20% Tretinoin gel (microsphere), 0.04%, was also superior (p<0.05) to the vehicle in the investigator's global evaluation of the clinical response.
In Study #3, fourteen percent (14%) of subjects using tretinoin gel (microsphere), 0.04%, achieved an excellent result compared to five percent (5%) of subjects on vehicle control. In Study #4, nineteen percent (19%) of subjects using tretinoin gel (microsphere), 0.04%, achieved an excellent result compared to nine percent (9%) of subjects on vehicle control.
🧪 Nonclinical Toxicology ▾
13 NONCLINICAL TOXICOLOGY
13.1Carcinogenesis, Mutagenesis, Impairment of Fertility Dermal carcinogenicity testing has not been performed with tretinoin gel (microsphere), 0.1%, 0.08%, 0.06% or 0.04%. In a 91-week dermal study in which CD-1 mice were administered 0.017% and 0.035% formulations of tretinoin, cutaneous squamous cell carcinomas and papillomas in the treatment area were observed in some female mice. These concentrations are near the tretinoin concentration of the 0.04% and 0.1% clinical formulations.
A dose-related incidence of liver tumors in male mice was observed at those same doses. The maximum systemic doses associated with the administered 0.017% and 0.035% formulations are 0.5 and 1.0 mg/kg/day tretinoin, respectively. These doses are two and four times the MRHD based on BSA comparison.
The biological significance of these findings is not clear because they occurred at doses that exceeded the dermal maximally tolerated dose of tretinoin and because they were within the background natural occurrence rate for these tumors in this strain of mice. There was no evidence of carcinogenic potential when 0.025 mg/kg/day of tretinoin was administered topically to mice (0.1 times the MRHD based on BSA comparison). Studies in hairless albino mice suggest that concurrent exposure to tretinoin may enhance the tumorigenic potential of carcinogenic doses of UVB and UVA light from a solar simulator.
This effect has been confirmed in a later study in pigmented mice, and dark pigmentation did not overcome the enhancement of photocarcinogenesis by 0.05% tretinoin. Although the significance of these studies to humans is not clear, patients should minimize exposure to sunlight or artificial ultraviolet irradiation sources [see Warnings and Precautions (5.2) ]. The genotoxic potential of tretinoin was evaluated in the Ames assay and in the in vivo mouse micronucleus assay, both of which were negative.
The components of the microspheres have shown potential for genetic toxicity and fetal malformation. EGDMA, a component of the excipient acrylates copolymer, was positive for induction of structural chromosomal aberrations in the in vitro chromosomal aberration assay in mammalian cells in the absence of metabolic activation, and negative for genetic toxicity in the Ames assay, and the in vivo mouse micronucleus assay. In oral fertility studies in rats with tretinoin, the no-observable effect level was 2 mg/kg/day (19 times the MRHD based on BSA comparison).
📄 Carcinogenesis, Mutagenesis, Impairment of Fertility ▾
13.1Carcinogenesis, Mutagenesis, Impairment of Fertility Dermal carcinogenicity testing has not been performed with tretinoin gel (microsphere), 0.1%, 0.08%, 0.06% or 0.04%. In a 91-week dermal study in which CD-1 mice were administered 0.017% and 0.035% formulations of tretinoin, cutaneous squamous cell carcinomas and papillomas in the treatment area were observed in some female mice. These concentrations are near the tretinoin concentration of the 0.04% and 0.1% clinical formulations.
A dose-related incidence of liver tumors in male mice was observed at those same doses. The maximum systemic doses associated with the administered 0.017% and 0.035% formulations are 0.5 and 1.0 mg/kg/day tretinoin, respectively. These doses are two and four times the MRHD based on BSA comparison.
The biological significance of these findings is not clear because they occurred at doses that exceeded the dermal maximally tolerated dose of tretinoin and because they were within the background natural occurrence rate for these tumors in this strain of mice. There was no evidence of carcinogenic potential when 0.025 mg/kg/day of tretinoin was administered topically to mice (0.1 times the MRHD based on BSA comparison). Studies in hairless albino mice suggest that concurrent exposure to tretinoin may enhance the tumorigenic potential of carcinogenic doses of UVB and UVA light from a solar simulator.
This effect has been confirmed in a later study in pigmented mice, and dark pigmentation did not overcome the enhancement of photocarcinogenesis by 0.05% tretinoin. Although the significance of these studies to humans is not clear, patients should minimize exposure to sunlight or artificial ultraviolet irradiation sources [see Warnings and Precautions (5.2) ]. The genotoxic potential of tretinoin was evaluated in the Ames assay and in the in vivo mouse micronucleus assay, both of which were negative.
The components of the microspheres have shown potential for genetic toxicity and fetal malformation. EGDMA, a component of the excipient acrylates copolymer, was positive for induction of structural chromosomal aberrations in the in vitro chromosomal aberration assay in mammalian cells in the absence of metabolic activation, and negative for genetic toxicity in the Ames assay, and the in vivo mouse micronucleus assay. In oral fertility studies in rats with tretinoin, the no-observable effect level was 2 mg/kg/day (19 times the MRHD based on BSA comparison).
📄 Patient Package Insert ▾
Patient Information Tretinoin gel (microsphere) (truh∙ti∙now∙uhn) Tretinoin gel (microsphere), 0.08%, for topical use Important information: Tretinoin gel (microsphere) is for use on skin only. Do not get tretinoin gel (microsphere) in your eyes, mouth, vagina or the corners of your nose. What is Tretinoin gel (microsphere)?
Tretinoin gel (microsphere) is a prescription medicine used on the skin (topical) to treat acne. Acne is a condition in which the skin has blackheads, whiteheads, and other pimples. It is not known if tretinoin gel (microsphere) is safe and effective in the treatment of other conditions.
It is not known if tretinoin gel (microsphere) is safe and effective in children under 12 years of age. What should I tell my doctor before using tretinoin gel (microsphere)? Before using tretinoin gel (microsphere), tell your doctor about all of your medical conditions, including if you: have a skin condition called eczema. have a sunburn.
You should not use tretinoin gel (microsphere) until your skin has healed. have any other medical condition. are pregnant or plan to become pregnant. It is not known if tretinoin gel (microsphere) will harm your unborn baby. are breastfeeding or plan to breastfeed. It is not known if tretinoin gel (microsphere) passes into your breast milk.
Tell your doctor about all of the medicines you take, including prescription and over-the-counter medicines, vitamins, herbal supplements, and any skin products that you use. Especially tell your doctor if you use any other medicines to treat your acne, including medicated cleansers or soaps. Using other topical acne products may increase the irritation of your skin when used with tretinoin gel (microsphere).
Know the medicines you take. Keep a list of them to show your doctor and pharmacist when you get a new medicine. How should I use tretinoin gel (microsphere)?
Use tretinoin gel (microsphere) exactly as your doctor tells you to use it. Your doctor may change your dose of tretinoin gel (microsphere) if you have skin irritation. Before you apply tretinoin gel (microsphere), gently wash the affected skin area with a mild, non-medicated soap.
Rinse and pat your skin dry. Apply tretinoin gel (microsphere) 1 time a day in the evening, or as prescribed by your doctor. Do not use more tretinoin gel (microsphere) than you need to cover the affected area and do not apply tretinoin gel (microsphere) more than 1 time a day.
Using too much tretinoin gel (microsphere) or using it too often will not give you faster or better results, and you may get skin redness, peeling, or discomfort. You may have a brief feeling of warmth or slight stinging after applying tretinoin gel (microsphere). You may use moisturizers and cosmetics.
Early in your treatment, you may get new pimples. At this stage, it is important to continue using tretinoin gel (microsphere). Your acne may not get better right away.
Use tretinoin gel (microsphere) even after your acne improves. Your acne may get better after two weeks of treatment, but more than seven weeks of tretinoin gel (microsphere) treatment are needed before you get the full benefit. Applying tretinoin gel (microsphere): Tretinoin gel (microsphere) comes in a pump.
If you have been prescribed the: Pump: Fully depress the pump twice to dispense tretinoin gel (microsphere) onto a fingertip. Apply a thin layer to cover the affected area, as prescribed by your doctor. Spread tretinoin gel (microsphere) evenly over the affected area.
Wash your hands after applying tretinoin gel (microsphere). What should I avoid while using tretinoin gel (microsphere)? Avoid washing your skin too often and scrubbing the affected skin area.
You should avoid sunlamps, tanning beds, and ultraviolet light during treatment with tretinoin gel (microsphere). Minimize exposure to sunlight. If you have to be in the sunlight or are sensitive to sunlight, use a sunscreen with SPF (sun protection factor) of 15 or more and wear a wide-brimmed hat or other protect… [Excerpted — this section continues on DailyMed.]
📄 Package Label / Principal Display Panel ▾
PRINCIPAL DISPLAY PANEL - 50 g Bottle Carton NDC 68308-777-50 Tretinoin Gel (Microsphere) 0.08% PUMP For Topical Use Only Rx Only Net wt. 50 g mayne pharma PRINCIPAL DISPLAY PANEL - 50 g Bottle Carton