Adapalene is not a steroid. It is a retinoid, a class of compounds derived from vitamin A. This is a common point of confusion because both retinoids and topical steroids are prescribed for skin conditions, but they work in completely different ways and carry different risks.
What Adapalene Actually Is
Adapalene is a third-generation topical retinoid. Retinoids are a family of compounds related to vitamin A that regulate how skin cells grow, divide, and shed. Adapalene specifically targets certain retinoid receptors in the skin, which helps unclog pores and reduce inflammation at the same time. It was FDA-approved for prescription use for acne vulgaris, and in 2016 the 0.1% gel (sold as Differin) was switched to over-the-counter status after an advisory committee voted unanimously that its safety profile supported OTC availability for adults and children over 12.
The higher-strength 0.3% gel, the lotion and cream formulations, and combination products with benzoyl peroxide remain prescription-only.
Why People Confuse It With Steroids
Topical corticosteroids (like hydrocortisone or betamethasone) are anti-inflammatory creams commonly prescribed for eczema, psoriasis, and allergic rashes. Because adapalene also reduces inflammation and comes in similar-looking tubes, it’s easy to assume they’re related. They’re not. Corticosteroids mimic hormones produced by your adrenal glands and suppress immune activity in the skin. Adapalene works through vitamin A pathways, speeding up cell turnover so dead skin cells don’t trap oil inside pores.
This distinction matters for a practical reason: topical steroids can thin the skin, cause rebound flares, and become less effective over time if used continuously. Those concerns don’t apply to adapalene. It’s designed for long-term, daily use. Clinical studies have followed patients using adapalene daily for a full year without those steroid-related complications emerging.
How Adapalene Treats Acne
Adapalene’s primary approved use is acne vulgaris. It works by normalizing the way skin cells behave inside your pores. Normally, dead cells can clump together and form a plug that traps oil, creating the environment where acne-causing bacteria thrive. Adapalene keeps those cells shedding properly so plugs don’t form in the first place. It also dials down inflammation, which is why it helps with red, swollen breakouts and not just blackheads and whiteheads.
Standard treatment involves applying a thin layer once daily in the evening. Most clinical trials run for 12 weeks, and you should expect your skin to look worse before it looks better during the first few weeks. Common side effects during this adjustment period include burning or stinging, dryness, flaky or peeling skin, redness, and increased sensitivity to sun and wind. These typically fade as your skin adapts.
How It Compares to Other Retinoids
Tretinoin (the active ingredient in Retin-A) is the most well-known prescription retinoid. Adapalene is generally milder. Because it targets specific retinoid receptors rather than activating all of them, it causes less irritation, which makes it a better starting point for people with sensitive skin. Tretinoin is more likely to cause stronger or longer-lasting redness, peeling, and stinging.
That said, tretinoin is usually considered more potent overall and requires a prescription. Some studies suggest adapalene 0.3% gel performs comparably to tretinoin 0.05% cream for improving skin texture and tone, which narrows the gap at higher concentrations. For most people starting out with acne treatment, adapalene 0.1% is the gentler, more accessible option.
Minimal Absorption Into the Body
One reason adapalene has a strong safety profile is that almost none of it enters your bloodstream. FDA pharmacology reviews found that when applied topically under maximum-use conditions, plasma levels in 12 out of 14 subjects were below the limit that lab equipment could even detect (less than 0.1 nanograms per milliliter). The remaining two subjects had levels barely above that threshold. In lab penetration tests, the amount of drug that passed fully through the skin was also undetectable. This is a topical treatment that stays local.
Pregnancy Considerations
Despite minimal absorption, adapalene carries a pregnancy category C designation because retinoids as a class can cause birth defects. Oral retinoids at high doses caused cleft palate and skeletal abnormalities in animal studies, though the doses involved were many times higher than what skin application delivers. There are no adequate studies in pregnant women. The standard recommendation is to avoid adapalene during pregnancy. It is also unknown whether adapalene passes into breast milk.
This is another area where the steroid confusion can matter. Certain low-potency topical steroids are considered relatively safe during pregnancy for managing eczema flares, but adapalene is not interchangeable with them and follows different safety guidelines entirely.