Accutane contains isotretinoin, a synthetic form of vitamin A that belongs to a class of compounds called retinoids. The original Accutane brand is no longer sold in the United States, but the same active ingredient is available under names like Absorica, Claravis, Amnesteem, Myorisan, and Zenatane. Whether brand or generic, the capsules all contain isotretinoin as the active ingredient, surrounded by a mix of oils, waxes, and other inactive ingredients that help your body absorb it.
The Active Ingredient: Isotretinoin
Isotretinoin, sometimes called 13-cis-retinoic acid, is a lab-made molecule closely related to vitamin A. Its molecular formula is C20H28O2. Despite being synthetic, it’s structurally almost identical to a compound your body produces naturally in small amounts. The difference is in the dose: a prescription delivers far more than your body would ever make on its own, which is what makes it powerful enough to clear severe acne.
Isotretinoin is highly fat-soluble, which matters for how the capsule is designed and how you take it. The drug absorbs significantly better when taken with a high-fat meal. Skipping fat at mealtime can lead to inconsistent absorption and a less effective treatment. One newer formulation, Absorica LD, was specifically engineered to reduce this “food effect” so absorption stays more consistent regardless of what you eat.
Inactive Ingredients in the Capsule
Beyond isotretinoin itself, each capsule contains several inactive ingredients that serve as fillers, preservatives, and stabilizers. According to the FDA-approved label for the original Accutane, these include:
- Soybean oil and hydrogenated soybean oil flakes: These lipid-based carriers help dissolve the fat-soluble isotretinoin so your body can absorb it. This is worth knowing if you have a soy allergy.
- Hydrogenated vegetable oil: Another fat base that aids absorption.
- Beeswax: Helps form the capsule’s internal structure.
- Butylated hydroxyanisole (BHA): A preservative that prevents the oils from going rancid.
- Edetate disodium: A stabilizer that helps maintain the formulation’s shelf life.
- Parabens (methyl and propyl): Preservatives used in the gelatin capsule shell.
- Glycerin: Keeps the gelatin capsule flexible.
The capsule shell itself is made of gelatin and colored with dyes that vary by strength. The 10 mg capsule uses iron oxide (red) and titanium dioxide. The 20 mg capsule uses FD&C Red No. 3, FD&C Blue No. 1, and titanium dioxide. The 40 mg capsule uses FD&C Yellow No. 6, D&C Yellow No. 10, and titanium dioxide. Generic versions may use slightly different inactive ingredients, so check the package insert if you have specific allergies.
How Isotretinoin Works in Your Body
Isotretinoin targets the oil glands in your skin. Severe acne is driven in large part by overactive sebaceous glands that pump out excess oil, creating an environment where bacteria thrive and pores clog. Isotretinoin triggers a process called apoptosis, which is essentially programmed cell death, in the cells that make up those oil glands. Research published in the Journal of Clinical Investigation confirmed this by taking skin biopsies from acne patients before and one week into treatment, finding clear evidence of oil gland cells dying off.
The mechanism works through a specific protein that isotretinoin ramps up production of. This protein acts as a signal that tells oil gland cells to self-destruct. When researchers blocked this protein using gene-silencing techniques, isotretinoin’s cell-killing ability dropped by about 80%. In other words, the drug doesn’t just dry out your skin from the surface. It fundamentally shrinks and deactivates the glands responsible for excess oil production, which is why its results tend to be long-lasting even after you stop taking it.
Dosage and Treatment Length
Isotretinoin dosing is based on body weight, typically 0.5 to 1 mg per kilogram of body weight per day, split into two doses. For someone weighing about 70 kg (154 pounds), that means roughly 35 to 70 mg daily. Treatment courses usually last 15 to 20 weeks. Absorica LD uses a slightly lower range of 0.4 to 0.8 mg per kg per day because of its improved absorption.
Common Side Effects
Because isotretinoin suppresses oil production throughout the body, dryness is by far the most common side effect. A large meta-analysis pooling data from thousands of patients found that about 49% experienced dry skin and roughly 42% developed cheilitis, which is dry, cracked, peeling lips. These two effects are so common that dermatologists sometimes view their absence as a sign the drug isn’t being absorbed well.
Liver enzyme elevations occurred in about 5% of patients, which is why blood tests are required during treatment. These elevations are usually mild and reversible but need monitoring.
The iPLEDGE Safety Program
Isotretinoin causes severe birth defects, so every prescription in the U.S. goes through a safety system called iPLEDGE. For patients who can become pregnant, this means pregnancy testing before and during treatment. The initial test must happen in a medical setting, though follow-up tests during treatment can now be done at home if the prescriber allows it. Prescriptions must be picked up within a 7-day window; if that window is missed, a new pregnancy test is required before the prescription can be filled. For patients who cannot become pregnant, the process is simpler, with no 30-day prescription window or monthly counseling documentation required.