Acne & skin-renewal actives
Tretinoin vs Tazarotene vs Azelaic acid
The table compares the compounds’ key data from their entry pages. Open each compound’s full entry for details. Educational content, not medical advice.
 Tretinoin | Tazarotene | Azelaic acid | |
|---|---|---|---|
| What it is | Topical retinoid all-trans-retinoic acid. Acne, photoaging, hyperpigmentation treatment. Dermatological gold standard. | Acetylenic (third-generation) topical retinoid prodrug. FDA-approved for acne, plaque psoriasis and photoaging (Tazorac, Arazlo 0.045% lotion, Fabior foam). More potent and more irritating than tretinoin; strictly prohibited in pregnancy. | Naturally occurring C9 dicarboxylic acid with a fourfold action: antimicrobial + comedolytic + anti-inflammatory + tyrosinase inhibitor (it lightens hyperpigmentation). FDA-approved for acne (20%) and rosacea (15%). One major advantage: it is safe in pregnancy. |
| ATC codeATC codeThe WHO Anatomical Therapeutic Chemical code that classifies drugs by organ system and mechanism. | D10AD01 | D05AX05 (topical antipsoriatic / retinoid) | D10AX03 (anti-acne) / dermatological |
| Prescription status | Prescription only (Rx), dermatologist supervision | Prescription-only (Rx) | Prescription only (Rx) at the 15%/20% concentration; weaker cosmetic versions are OTC |
| Mechanism of actionMechanism of actionThe molecular pathway by which a compound acts in the body (e.g. which receptor or enzyme it binds). | RAR-α/β/γ retinoid receptor agonist (all-trans-retinoic acid) | RAR-β/γ selective retinoid prodrug → tazarotenic acid; keratinization normalization | Antimicrobial + comedolytic + anti-inflammatory + tyrosinase inhibitor |
| Half-lifeHalf-lifeThe time for the compound’s plasma concentration to fall by half; indicates how fast it clears and how often it is dosed. | Topical, minimal systemic absorption | — | — |
| Onset of actionOnsetThe time from dosing until a measurable effect appears. | 8-12 weeks (acne), 4-6 months (anti-aging) | 4-8 weeks (acne); 12+ weeks (photoaging, psoriasis) | 4-8 weeks (acne/rosacea); 8-12+ weeks (pigment marks) |
| Strengths | — | 0.045% lotion · 0.05% / 0.1% gel/cream · 0.1% foam | 20% cream (acne) · 15% gel / 15% foam (rosacea) |
| Full entry | Open → | Open → | Open → |
What it is
TretinoinTopical retinoid all-trans-retinoic acid. Acne, photoaging, hyperpigmentation treatment. Dermatological gold standard.
TazaroteneAcetylenic (third-generation) topical retinoid prodrug. FDA-approved for acne, plaque psoriasis and photoaging (Tazorac, Arazlo 0.045% lotion, Fabior foam). More potent and more irritating than tretinoin; strictly prohibited in pregnancy.
Azelaic acidNaturally occurring C9 dicarboxylic acid with a fourfold action: antimicrobial + comedolytic + anti-inflammatory + tyrosinase inhibitor (it lightens hyperpigmentation). FDA-approved for acne (20%) and rosacea (15%). One major advantage: it is safe in pregnancy.
ATC codeATC codeThe WHO Anatomical Therapeutic Chemical code that classifies drugs by organ system and mechanism.
TretinoinD10AD01
TazaroteneD05AX05 (topical antipsoriatic / retinoid)
Azelaic acidD10AX03 (anti-acne) / dermatological
Prescription status
TretinoinPrescription only (Rx), dermatologist supervision
TazarotenePrescription-only (Rx)
Azelaic acidPrescription only (Rx) at the 15%/20% concentration; weaker cosmetic versions are OTC
Mechanism of actionMechanism of actionThe molecular pathway by which a compound acts in the body (e.g. which receptor or enzyme it binds).
TretinoinRAR-α/β/γ retinoid receptor agonist (all-trans-retinoic acid)
TazaroteneRAR-β/γ selective retinoid prodrug → tazarotenic acid; keratinization normalization
Azelaic acidAntimicrobial + comedolytic + anti-inflammatory + tyrosinase inhibitor
Half-lifeHalf-lifeThe time for the compound’s plasma concentration to fall by half; indicates how fast it clears and how often it is dosed.
TretinoinTopical, minimal systemic absorption
Tazarotene—
Azelaic acid—
Onset of actionOnsetThe time from dosing until a measurable effect appears.
Tretinoin8-12 weeks (acne), 4-6 months (anti-aging)
Tazarotene4-8 weeks (acne); 12+ weeks (photoaging, psoriasis)
Azelaic acid4-8 weeks (acne/rosacea); 8-12+ weeks (pigment marks)
Strengths
Tretinoin—
Tazarotene0.045% lotion · 0.05% / 0.1% gel/cream · 0.1% foam
Azelaic acid20% cream (acne) · 15% gel / 15% foam (rosacea)