The most common side effects seen with Targretin (in more than 1 patient in 10) are leucopenia (reduced white cell count), hypothyroidism (underactive thyroid gland), hyperlipaemia (high levels of fats in the blood), hypercholesterolaemia (high blood cholesterol), exfoliative dermatitis (skin peeling), pruritus (itching), rash, pain, headache and asthenia (weakness).