A potent prescription vitamin A skin cream, first developed for acne and psoriasis and later cleared to improve sun-aged facial skin. Evidence shows it reduces fine and coarse wrinkles, fades uneven brown coloring, and smooths rough texture; benefits last only while use continues. The main drawback is irritation and heightened sun sensitivity, and it must never be used in pregnancy. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Pregnancy status (urine/serum hCG) | Negative before and during use | Tazarotene is teratogenic and contraindicated in pregnancy |
| Local skin reaction grade | Mild or none | Tracks the main dose-limiting side effect to guide titration |
| Photodamage severity score | Improvement of ≥1 grade from baseline | Defines cosmetic success objectively over months |
| Vitamin A status (serum retinol) | Within normal reference range | Optional; only relevant if combining with high-dose oral vitamin A |
Cadence: Baseline before starting, then ~2 weeks (tolerability), 12 weeks, and every 3–6 months