Medicine Online
Any medical inquiries? Search MOL for answers:
MEDICAL DRUGS
Home > Medical Drugs > Drugs beginning with R > RETIN-A MICRO® (tretinoin gel) microsphere, 0.1% and 0.04%
Medical References
Diseases & Conditions
Women's Health
Mental Health
Men's Health
Healthy Choice News
Site Map Links
Medical Tips
Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.
Read more health news

RETIN-A MICRO® (tretinoin gel) microsphere, 0.1% and 0.04%

FOR TOPICAL USE ONLY. NOT FOR OPHTHALMIC, ORAL, OR INTRAVAGINAL USE.

DESCRIPTION

RETIN-A MICRO® (tretinoin gel) microsphere, 0.1% and 0.04%, is a formulation containing 0.1% or 0.04%, by weight, tretinoin for topical treatment of acne vulgaris. This formulation uses patented methyl methacrylate/glycol dimethacrylate crosspolymer porous microspheres (MICROSPONGE® System) to enable inclusion of the active ingredient, tretinoin, in an aqueous gel. Other components of this formulation are purified water, carbomer 974P (0.04% formulation), carbomer 934P (0.1% formulation), glycerin, disodium EDTA, propylene glycol, sorbic acid, PPG-20 methyl glucose ether distearate, cyclomethicone and dimethicone copolyol, benzyl alcohol, trolamine, and butylated hydroxtoluene.

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 family of compounds, and a metabolite of naturally occurring Vitamin A. Tretinoin has a molecular weight of 300.44. Tretinoin has the following structure:

CLINICAL PHARMACOLOGY

Tretinoin is a retinoid metabolite of Vitamin A that binds to intracellular receptors in the cytosol and nucleus, but cutaneous levels of tretinoin in excess of physiologic concentrations occur following application of a tretinoin-containing topical drug product.

Although tretinoin activates three members of the retinoid 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, other mechanisms, or both.

INDICATIONS AND USAGE

Retin-A Micro (tretinoin gel) microsphere, 0.1% and 0.04%, is indicated for topical application in the treatment of acne vulgaris. The safety and efficacy of the use of this product in the treatment of other disorders have not been established.

CLINICAL STUDIES

CONTRAINDICATIONS

This drug is contraindicated in individuals with a history of sensitivity reactions to any of its components. It should be discontinued if hypersensitivity to any of its ingredients is noted.

PRECAUTIONS:

General:

  • The skin of certain individuals may become excessively dry, red, swollen, or bulered. 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 had not been established. If a reaction suggesting sensitivity occurs, use of the medication should be discontinued. Excessive skin dryness may also be experienced; if so, use of an appropriate emollient during the day may be helpful.
  • Unprotected exposure to sunlight, including sunlamps, should be minimized during the use of Retin-A Micro (tretinoin gel) microsphere, 0.1% and 0.04%, 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 considerable sun exposure due to occupation and those with inherent sensitivity to the sun should exercise particular caution. Use of sunscreen products (SPF 15) and protective clothing over treated areas are recommended when exposure cannot be avoided.
  • Weather extremes, such as wind or cold, also may be irritating to patients under treatment with tretinoin.
  • Retin-A Micro (tretinoin gel) microsphere, 0.1% and 0.04%, should be kept away from the eyes, the mouth, paranasal creases of the nose, and mucous membranes.
  • Tretinoin has been reported to cause severe irritation on eczematous skin and should be used with utmost caution in patients with this condition.

Pregnancy: Teratogenic Effects: Pregnancy Category C.

In a study of pregnant rats treated with topical application of Retin-A Micro (tretinoin gel) microsphere, 0.1%, at doses of 0.5 to 1 mg/kg/day on gestation days 6-15 (4 to 8 times the maximum human systemic dose of tretinoin normalized for total body surface area after topical administration of Retin-A Micro (tretinoin gel) microsphere, 0.1%) some alterations were seen in vertebrae and ribs of offspring. In another study, pregnant New Zealand white rabbits were treated with Retin-A Micro (tretinoin gel) microsphere, 0.1%, at doses of 0.2, 0.5, and 1.0 mg/kg/day, administered topically for 24 hours a day while wearing Elizabethan collars to prevent ingestion of the drug. There appeared to be increased incidences of certain alterations, including domed head and hydrocephaly, typical of retinoid-induced fetal malformations in this species, at 0.5 and 1.0 mg/kg/day. Similar malformations were not observed at 0.2 mg/kg/day, 3 times the maximum human systemic dose of tretinoin after topical administration of Retin-A Micro (tretinoin gel) microsphere, 0.1%, normalized for total body surface area. In a repeat study of the highest topical dose (1.0 mg/kg/day) in pregnant rabbits, these effects were not seen, but a few alterations that may be associated with tretinoin exposure were seen. Other pregnant rabbits exposed topically for six hours to 0.5 or 0.1 mg/kg/day tretinoin while restrained in stocks to prevent ingestion, did not show any teratogenic effects at doses up to 17 times (1.0 mg/kg/day) the maximum human systemic dose after topical administration of Retin-A Micro (tretinoin gel) microsphere, 0.1%, adjusted for total body surface area, but fetal resorptions were increased at 0.5 mg/kg. In addition, topical tretinoin in non Retin-A Micro (tretinoin gel) microsphere formulations was not teratogenic in rats and rabbits when given in doses of 42 and 27 times the maximum human systemic dose after topical administration of Retin-A Micro (tretinoin gel) microsphere, 0.1%, normalized for total body surface area, respectively, (assuming a 50 kg adult applied a daily dose of 1.0 g of 0.1% gel topically). At these topical doses, however, delayed ossification of several bones occurred in rabbits. In rats, a dose-dependent increase of supernumerary ribs was observed.

Oral tretinoin has been shown to be teratogenic in rats, mice, rabbits, hamsters, and subhuman primates. Tretinoin was teratogenic in Wistar rats when given orally or topically in doses greater than 1 mg/kg/day (8 times the maximum human systemic dose normalized for total body surface area). However, variations in teratogenic doses among various strains of rats have been reported. In the cynomolgus monkey, which metabolically is more similar to humans than other species in its handling of tretinoin, fetal malformations were reported for doses of 10 mg/kg/day or greater, but none were observed at 5 mg/kg/day (83 times the maximum human systemic dose normalized for total body surface area), 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.

Topical tretinoin in animal teratogenicity tests has generated equivocal results. There is evidence for teratogenicity (shortened or kinked tail) of topical tretinoin in Wistar rats at doses greater than 1 mg/kg/day (8 times the maximum human systemic dose normalized for total body surface area). Anomalies (humerus: short 13%, bent 6%, os parietal incompletely ossified 14%) have also been reported when 10 mg/kg/day was topically applied. Supernumerary ribs have been a consistent finding in rats when dams were treated topically or orally with retinoids.

There are no adequate and well-controlled studies in pregnant women. Retin-A Micro should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

With widespread use of any drug, a small number of birth defect reports associated temporally with the administration of the drug would be expected by chance alone. Thirty human cases of temporally associated congenital malformations have been reported during two decades of clinical use of Retin-A. 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.

Non-Teratogenic Effects:

Topical tretinoin has been shown to be fetotoxic in rabbits when administered 0.5 mg/kg/day (8 times the maximum human systemic dose applied topically and normalized for total body surface area), resulting in fetal resorptions and variations in ossification. Oral tretinoin has been shown to be fetotoxic, resulting in skeletal variations and increased intrauterine death in rats when administered 2.5 mg/kg/day (21 times the maximum human systemic dose applied topically and normalized for total body surface area).

There are, however, no adequate and well-controlled studies in pregnant women.

ADVERSE REACTIONS:

Irritation Potential:

OVERDOSAGE

Retin-A Micro (tretinoin gel) microsphere, 0.1% and 0.04%, is intended for topical use only. If medication is applied excessively, no more rapid or better results will be obtained and marked redness, peeling, or discomfort may occur. 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.

DOSAGE AND ADMINISTRATION

Retin-A Micro (tretinoin gel ) microsphere, 0.1% and 0.04%, should be applied once a day, in the evening, to the skin where acne lesions appear, using enough to cover the entire affected area lightly. Application of excessive amounts of gel may result in “caking” of the gel, and will not provide incremental efficacy.

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.

Therapeutic results may be noticed after two weeks, but more than seven weeks of therapy are required before consistent beneficial effects are observed.

Patients treated with Retin-A Micro (tretinoin gel) microsphere, 0.1% and 0.04%, may use cosmetics, but the areas to be treated should be cleansed thoroughly before the medication is applied.

HOW SUPPLIED

Retin-A Micro® (tretinoin gel) microsphere, 0.1% tube: 20g (NDC 0062-0190-02), 45g (NDC 0062-0190-03).

Retin-A Micro® (tretinoin gel) microsphere, 0.1% pump: 50g (NDC 0062-0190-11).

Retin-A Micro® (tretinoin gel) microsphere, 0.04% tube: 20g (NDC 0062-0204-02), 45g (NDC 0062-0204-03).

Retin-A Micro® (tretinoin gel) microsphere, 0.04% pump: 50g (NDC 0062-0204-11).

Storage Conditions: Store at 15º - 25° C (59° - 77°F).

Rx only.

Patent Nos.: 4,690,825; 5,145,675 & 5,955,109

Distributed by: OrthoNeutrogena
Division of Ortho-McNeil Pharmaceutical, Inc.
Los Angeles, CA 90045

RETIN-A MICRO® is a registered trademark of Ortho-McNeil Pharmaceutical, Inc.

MICROSPONGE® is a registered trademark of Cardinal Health, Inc. Dublin, OH.

© OMP 2006
Issued May 2006
10352800
10352900

Patient Package Insert

(Logo)

PATIENT INFORMATION

RETIN-A MICRO® (ret-in-A MY-kroe)

(tretinoin gel) microsphere, 0.1% and 0.04%

For Topical Use Only

Read this information carefully before you start to use your medicine and each time you get more medicine. There may be new information about this medicine when you get your prescription renewed. This leaflet provides a summary of the information about RETIN-A MICRO®. It does not include everything there is to know about your medicine. This information does not take the place of talking with your doctor; so, if you have any questions or are not sure about something, ask your doctor or pharmacist.

What is the most important information I should know about RETIN-A MICRO®?

Tell your doctor if you are pregnant, think you are pregnant, trying to get pregnant, or are breast feeding. If you become pregnant while using RETIN-A MICRO®, contact your doctor right away.

RETIN-A MICRO® may make your skin very dry, red, swollen or bulered. Contact your doctor if these side effects bother you.

Use other acne medicines with RETIN-A MICRO® only on your doctor's advice and follow your doctor's instructions carefully. The medicines you have used in the past might cause too much redness or peeling.

Avoid sunlight or sunlamps and medicines that may make you more sensitive to sunlight. Your doctor can help you find out if you are taking medicines that may make you more sensitive to sunlight. (See “Who should not use RETIN-A MICRO®?” And “What should I avoid while using RETIN-A MICRO®?”)

What is RETIN-A MICRO®?

RETIN-A MICRO® is a prescription medicine that you put on your skin to treat acne. Acne is a condition in which the skin has blackheads, whiteheads, and other pimples.

Who should not use RETIN-A MICRO®?

Do not use RETIN-A MICRO® if:

  • -you are sunburned. Do not use RETIN-A MICRO® until your skin has fully recovered.
  • -you have eczema or other skin conditions. RETIN-A MICRO® can cause severe irritation if used on eczema.
  • -you are allergic to any of the ingredients in RETIN-A MICRO®.

The active ingredient is tretinoin. See the ul of other ingredients at the end of this leaflet.

Tell your doctor before using RETIN-A MICRO® if

  • -you are pregnant, planning to become pregnant, or may be pregnant.
  • -you are breast feeding. We do not know if RETIN-A MICRO® can pass through your milk to the baby.
  • -you are using any other medicines to treat your acne. Do not use other medicines unless they are recommended by your doctor. Other acne medicines used with RETIN-A MICRO® may make your face more likely to be dry and red and cause it to peel.
  • -you are taking medicines for other health conditions. Some medicines may make your skin more sensitive to sunlight. Tell your doctor about all medicines that you are taking. (See “Who should not use RETIN-A MICRO®?” And “What should I avoid while using RETIN-A MICRO®?”)

How should I use RETIN-A MICRO®?

Wash your skin with mild, non-medicated soap and dry your skin gently. Apply RETIN-A MICRO® once a day in the evening, or as directed by your doctor.

Tube: Squeeze a small amount of RETIN-A MICRO® (about the size of a pea) on your fingertip. Dab RETIN-A MICRO® on your forehead, chin, and both cheeks. Spread RETIN-A MICRO® evenly over the entire surface of your face by gently smoothing it into your skin.

Pump: Fully depress the pump twice to dispense a small amount of RETIN-A MICRO® (about the size of a pea) onto your fingertip. Dab RETIN-A MICRO® on your forehead, chin and both cheeks. Spread RETIN-A MICRO® evenly over the entire surface of your face by gently smoothing it into your skin.

Do not put RETIN-A MICRO® near your mouth, eyes, or open sores, or on the corners of your nose. Spread RETIN-A MICRO® away from these areas when putting RETIN-A MICRO® on your skin.

Do not use more RETIN-A MICRO® than your doctor has prescribed. Do not use RETIN-A MICRO® more often than your doctor has told you. Too much RETIN-A MICRO® may irritate or increase the irritation of your skin, and will not give faster or better results.

You can use a facial cream or lotion each morning after washing your face. It should contain a sun protection factor (SPF) of 15 or higher. Follow your doctor's advice because you need to use a cream or lotion that will not make your acne worse. You may use cosmetics with RETIN-A MICRO®. However, clean your face before using cosmetics and remove cosmetics from your skin before using RETIN-A MICRO®. Talk to your doctor about recommended cosmetics.

You may not see improvement right away. RETIN-A MICRO® may work better for some patients than for others. Keep using RETIN-A MICRO® even after your acne improves. You may notice some results after two weeks, but more than seven weeks of using RETIN-A MICRO® are needed before you see the full benefit.

Early in therapy, you may notice new pimples. At this stage, it is important to continue using RETIN-A MICRO®.

Once your acne is under control you should continue regular application of RETIN-A MICRO® until your doctor instructs otherwise.

What should I avoid while using RETIN-A MICRO®?

Spend as little time as possible in the sun. Use a daily sunscreen with a SPF 15 rating or higher, sun protective clothing, and a wide brimmed hat to protect you from sunlight. When outside, even on hazy days, areas treated with RETIN-A MICRO® should be protected. Do not use sunlamps. RETIN-A MICRO® may make you get sunburned more easily. If you do get sunburned, stop using RETIN-A MICRO® until your skin is completely back to normal. Talk to your doctor about how to protect your skin if you must be in sunlight a lot.

Avoid cold weather and wind as much as possible and use clothing to protect you from the weather. Skin treated with RETIN-A MICRO® may dry out or get windburned more easily.

Avoid skin products that may dry or irritate your skin. Such products are those that contain astringents, alcohol, or spices and include certain medicated soaps, shampoos and hair permanent solutions. Avoid contact with the peel of limes. Your skin may become very dry, red, swollen, bulered, or crusted with these products. If you get severe skin irritation or skin irritation that will not go away, stop using RETIN-A MICRO® and call your doctor. You should talk to your doctor about the use of all skin care products while using RETIN-A MICRO®.

Avoid washing your face too often and do not scrub your face hard when washing it. Use a mild, non-medicated soap and wash gently and pat dry.

Talk to your doctor about using other acne medicines while using RETIN-A MICRO® as they could cause redness or peeling.

What are the possible side effects of RETIN-A MICRO®?

A brief feeling of warmth or stinging may be normal when you apply RETIN-A MICRO®.

The most common side effect with RETIN-A MICRO® is skin irritation. This can include skin redness, burning, stinging, itching, dryness, and peeling. Some of these side effects may go away or bother you less after you have used RETIN-A MICRO® for a few weeks. Tell your doctor if these side effects become a problem. Your doctor may change your dose of RETIN-A MICRO®. However, the effectiveness of RETIN-A MICRO® when used less than once a day has not been proven.

There may be some mild discomfort or peeling during the early weeks of treatment. Some patients also notice that their skin begins to take on a blush. These reactions happen to about half of the people using RETIN-A MICRO®. If this happens to you, it is just your skin getting used to RETIN-A MICRO®. This usually improves by 4 weeks after starting treatment. These reactions can usually be lessened by following instructions carefully. If the discomfort is a problem, talk to your doctor.

Call your doctor right away if your face becomes very dry, red, swollen, or bulered. Your doctor may ask you to stop using RETIN-A MICRO® for a while, change the amount of RETIN-A MICRO® you are using, or change the times that you use RETIN-A MICRO®.

These are not all the side effects possible with RETIN-A MICRO®. For more information, ask your doctor or pharmacist.

General Information about RETIN-A MICRO®.

This medicine is for your use only. Do not allow anyone else to use this medicine. Medicines are sometimes prescribed for conditions not mentioned in patient information leaflets. Do not use RETIN-A MICRO® for a condition for which it was not prescribed by your doctor.

What are the ingredients of RETIN-A MICRO®?

The active ingredient is tretinoin. The inactive ingredients are purified water, carbomer 974P (0.04% formulation), carbomer 934P (0.1% formulation), glycerin, disodium EDTA, propylene glycol, sorbic acid, PPG-20 methyl glucose ether distearate, cyclomethicone and dimethicone copolyol, benzyl alcohol, trolamine, and butylated hydroxytoluene.

How do I store RETIN-A MICRO®?

RETIN-A MICRO® should be stored at room temperature, 15°- 25° C (59° - 77° F).

Where can I get more information about RETIN-A MICRO®?

You can ask your doctor or pharmacist for the information about RETIN-A MICRO® that is written for health professionals. You can also contact OrthoNeutrogena by calling their toll-free number: 877-738-4624. Call between 9:00 a.m. and 3:00 p.m. Eastern Time, Monday through Friday. Or you can visit our website: www.retinamicro.com.

Patent Nos: 4,690,825; 5,145,675 & 5,955,109

Distributed by: OrthoNeutrogena
Division OF Ortho-McNeil Pharmaceutical, Inc.

Los Angeles, CA 90045

RETIN-A MICRO® is a registered trademark of Ortho-McNeil Pharmaceutical, Inc.
MICROSPONGE® is a registered trademark of Cardinal Health, Inc. Dublin, OH.
Made in the USA

HomeSitemap Contact UsAdvertisingPress RoomGive Us Your FeedbackRead Our Terms & Conditions and Our DisclaimerPrivacy Statement