Tretinoin (Retin-A): uses, dosage, side effects and refills

Tretinoin is all-trans-retinoic acid, the active acid form of vitamin A, applied to the skin as a cream, gel or lotion. It was the first topical retinoid: Retin-A liquid was approved in October 1971, the cream in 1973 and the gel in 1975, and the Retin-A Micro microsphere gel followed in February 1997 (Drugs@FDA, NDAs 016921, 017340, 017579 and 020475). Bausch Health holds the brand today, and generic creams and gels are made by several companies.

ClinCalc DrugStats ranks tretinoin 176th among US prescriptions for 2024, at about 3.1 million fills, which makes it the most prescribed acne cream in the country.

One molecule, several products. Strength and vehicle change how strong and how drying a product feels: gels with alcohol bases dry oily skin more, creams suit dry skin, and the microsphere gel releases drug more slowly. The labels state that higher strengths are not automatically better; tolerance decides.

This page covers topical tretinoin. Oral tretinoin capsules treat a type of leukemia (acute promyelocytic leukemia) under oncology supervision and are not interchangeable with the skin products. The related oral acne drug is isotretinoin, a different molecule.

FDA-labeled use: acne vulgaris

Every current tretinoin acne label lists one indication: the topical treatment of acne. Retin-A cream and gel carry no age floor on the older label; Retin-A Micro is approved for patients 12 years and older (Retin-A Micro label, section 1).

In two 12-week trials of Retin-A Micro 0.1%, total lesion counts fell 45% and 32% on tretinoin versus 23% and 16% on the vehicle gel, and 35% and 28% of treated patients had an "excellent" investigator rating against 11% and 9% on vehicle. With the 0.04% strength, total lesions fell 40% and 35% versus 8% and 20% (Retin-A Micro label, section 14). These are trial averages; individual results vary.

Tretinoin acts mainly on comedones (blackheads and whiteheads), so it is often paired with an antibacterial such as benzoyl peroxide or clindamycin for inflamed spots.

Fine facial wrinkles: Renova 0.02% only

Renova cream 0.02% is labeled as an add-on, alongside sun avoidance and skin care, to soften fine facial wrinkles. Its label states plainly that it does not eliminate wrinkles, repair sun damage or reverse photoaging, and that up to 6 months may pass before any effect shows. Using an acne-strength product for wrinkles is off-label.

Other off-label uses

Dermatologists also prescribe tretinoin for flat warts, keratosis pilaris and dark spots, and it is one of three ingredients in Tri-Luma for melasma (see hydroquinone). These uses fall outside the acne labels; ask whether the evidence fits your case.

Acne begins as a microcomedo: dead skin cells stick together inside the hair follicle and plug it with oil. The Retin-A Micro label (section 12.1) says tretinoin appears to reduce how tightly those follicle-lining cells cling together, so fewer microcomedones form, and it speeds the turnover of those cells so existing plugs are pushed out.

At the molecular level tretinoin binds the three retinoic acid receptors (RAR-alpha, beta and gamma) inside skin cells and changes which genes are switched on, although the label notes it has not been proven that this is how the acne benefit arises.

That same push to the surface explains the early flare. The Retin-A label warns that inflammatory lesions may seem to get worse in the first weeks because deep lesions are brought up, and the patient leaflet says new papules and pustules may appear between weeks 3 and 6.

Absorption into the body is small. In a study of a 0.1% gel applied daily for up to 28 days, about 0.8% of a single dose and 1.4% of repeated doses were absorbed, and blood levels of tretinoin and its metabolites stayed in the normal dietary range of 1 to 3 ng/mL (Retin-A Micro label, section 12.3).

Topical tretinoin has no absolute contraindications in the Retin-A Micro label; the older Retin-A label says to stop it if hypersensitivity to an ingredient appears.

Tell your prescriber if you have:

• Eczema or very sensitive skin. Both labels warn that tretinoin can cause severe irritation on eczematous skin.
• Current sunburn. Do not start until it has healed (Retin-A Micro label, 5.3).
• A job or sport with long sun exposure, or naturally sun-sensitive skin.
• Other acne products you use: benzoyl peroxide, salicylic acid, sulfur or resorcinol raise the risk of dryness and peeling. The label suggests letting irritation from those products settle before starting.
• Photosensitizing medicines, such as doxycycline or a thiazide diuretic like hydrochlorothiazide.
• Pregnancy, plans for pregnancy or breastfeeding (see below).
• Skin cancer or actinic keratoses (MedlinePlus).
• Upcoming waxing, laser or chemical peels, which can injure retinoid-treated skin.

Retin-A gels contain about 90% alcohol and are flammable; keep them away from flame and do not smoke while applying.

A useful question for your prescriber: "Which strength and vehicle suit my skin type, and should I start every other night?"

Timing. Apply once a day in the evening or at bedtime (Retin-A and Retin-A Micro labels, section 2). Use it at about the same time each night.

Step by step (labels and MedlinePlus):

1. Wash with a mild, non-medicated cleanser and pat dry.
2. Wait 20 to 30 minutes until skin is fully dry; damp skin absorbs more and stings more (Retin-A patient leaflet).
3. Squeeze out about half an inch or less for the whole face. Dot it on forehead, chin and both cheeks, then spread a thin layer over the whole area where acne appears, not just single spots.
4. Keep it away from the eyes, mouth, corners of the nose and mucous membranes.
5. If cream is still visible, or gel flakes off within a minute ("pilling"), you used too much.
6. Wash your hands afterward.

Mornings: apply a non-comedogenic moisturizer, and sunscreen of SPF 15 or higher whenever you will be outdoors (Retin-A Micro label, 5.3).

Starting gently. The patient leaflet says your physician may suggest every-other-night application at first if your skin is sensitive. Note the Retin-A Micro label adds that efficacy at reduced frequencies has not been established.

Patience. Expect dryness and peeling in the first 2 to 4 weeks. Some benefit shows at 2 to 3 weeks, but the Retin-A label says more than 6 weeks may be needed, and the leaflet says many users see improvement by 12 weeks. Keep using it once acne is controlled unless your prescriber says otherwise; MedlinePlus notes improvement can fade after stopping.

Makeup is fine after the medicine has absorbed, provided the skin is cleaned before each application.

Your prescriber chooses the strength and vehicle. This table is reference only.

• No kidney or liver adjustment is needed, because so little reaches the bloodstream.
• Older adults: neither label found enough people over 65 in trials to draw conclusions; acne at that age is uncommon, and wrinkle products are used instead.
• Stepping up: prescribers usually start with a low strength or a cream and move up only once the skin tolerates it. The Retin-A label says any change of vehicle, concentration or frequency should be watched closely.
• Too much irritation: the labels allow applying less often or pausing until skin recovers, then resuming.
• Maintenance: the Retin-A label says that once lesions respond it may be possible to keep the improvement with less frequent use; agree a plan with your prescriber.

Ask: "If my skin peels badly in week two, should I skip nights or switch strength?"

Skipping one night of tretinoin does not matter much, because it works over weeks. MedlinePlus advice: if the next bedtime application is close, skip the forgotten one; otherwise apply it once you remember. Never apply a double layer or a second dose to catch up; the labels state extra application only adds redness and peeling.

Applying too much tretinoin will not clear acne faster; the Retin-A label says it causes marked redness, peeling or discomfort. Wash it off and let the skin recover. Swallowing the cream or gel may cause effects like excess vitamin A intake, such as headache, nausea and dizziness (Retin-A Micro label, section 10). A child who swallows some needs a call to Poison Help (1-800-222-1222); seizures, collapse or trouble breathing warrant 911.

• Unprotected sun, sunlamps and tanning beds. Use SPF 15 or higher and a hat.
• Harsh skin care: abrasive scrubs, medicated or drying soaps, toners or astringents with alcohol, and products with spices or lime peel (Retin-A Micro label, 5.1).
• Other acne actives at the same time unless prescribed together.
• Waxing treated skin, which can lift the top layer.
• Applying to eczema, sunburn, cuts or the eyelids.
• Wind and cold extremes, which the labels say irritate treated skin.
• Fire or smoking while applying an alcohol-based gel.

Pregnancy: oral tretinoin causes birth defects, and animal studies of topical tretinoin at many times the human dose showed skeletal changes and malformations. The current Retin-A Micro label (8.1) says decades of observational studies of topical tretinoin in pregnancy have not established a risk of major birth defects or miscarriage, though the studies had limits. The older Retin-A label records 30 spontaneous reports of birth defects over two decades, five involving holoprosencephaly, with no causal link shown. Many clinicians still advise stopping topical retinoids while pregnant; ask yours before conceiving.

Breastfeeding: no milk data exist. The label advises using the smallest area for the shortest time and not applying it to the nipple or areola.

Keep Retin-A cream below 80°F and the gels below 86°F (Retin-A label); Retin-A Micro is stored at 68°F to 77°F, with the pump upright. Close tubes tightly. Gels are flammable; never store them above 120°F or near flame. Keep out of reach of children.

Generic tretinoin is inexpensive at Mark Cuban Cost Plus Drugs. Totals below include its $5 dispensing fee; shipping is extra (Cost Plus Drugs tretinoin product pages, checked 6 Oct 2026):

Gels cost more: 0.01% gel was $25.83 for 15 g and $48.70 for 45 g, and the 0.05% Atralin generic gel was $142.57 for 45 g. Brand Retin-A Micro and lotions usually cost more again.

Many insurance plans cover tretinoin for acne but may require a prior authorization for adults over a set age, because of cosmetic use. Temi's review fee is separate and does not change the medication price.

Other acne and skin medicines with their own pages:

• Benzoyl peroxide: antibacterial often layered with a retinoid.
• Clindamycin: topical antibiotic for inflamed acne.
• Isotretinoin: oral retinoid reserved for severe nodular acne.
• Doxycycline: oral antibiotic for moderate to severe acne.
• Spironolactone: hormonal acne option for women.
• Sulfacetamide and sulfur: older wash for acne and rosacea.
• Hydroquinone: bleaching cream combined with tretinoin for melasma.

Temi physicians can prescribe tretinoin, which is not a controlled substance. Already using it? Renewal goes through a refill review at $15 per refill (usetemi.com/prescription/refills, checked 5 Oct 2026), and Temi Care members pay nothing for refills. Starting tretinoin for the first time means a new prescription review, which is $79 (usetemi.com/get-prescribed, checked 5 Oct 2026). Expect questions about pregnancy plans and possibly photos of your skin. Reviews are answered within 48 hours, and you can send the prescription to any pharmacy, Cost Plus Drugs included.