Avicenna capsule should be discontinued after the skin lesions have subsided sufficiently, and the specific medication should be used in accordance with the doctor’s instructions. Aviva Capsules are indicated for the treatment of severe psoriasis including pustular psoriasis, erythrodermic psoriasis, and other keratotic skin diseases. Treatment with the drug is divided into initiation and maintenance therapy, and the drug is generally discontinued during maintenance therapy when the lesions have subsided sufficiently. The drug is contraindicated in people who are allergic to Avitamin A or to other retinoids, in people who are allergic to vitamin A and its metabolites, in women with hypervitaminosis A or with the desire to have children within two years, in pregnant and breastfeeding women, in people with severe hepatic and renal insufficiency, in people with hyperlipidemia. The main and common adverse reactions after the use of the drug are vitamin A overdose syndrome-like reactions, which are characterized by lipitis, rhinitis, dry mouth, dry eyes, conjunctivitis, itching, light/sensory sensitization, erythema, dryness, scaling, and so on. Specific medication should be administered under the guidance of a specialist, and should not be used or discontinued without authorization.