fluticasone and Osteonecrosis

Inhaled corticosteroids are generally considered safe and do not usually lead to systemic adverse events since their plasma concentrations are low due to hepatic metabolism by the cytochrome P450 3A4. However, when associated with inhibitors of this cytochrome, such as ritonavir, they may lead to iatrogenic Cushing syndrome by the systemic accumulation of corticosteroids and consequent suppression of the hypothalamic-pituitary-adrenal axis. We present a case of iatrogenic Cushing syndrome complicated by multifocal osteonecrosis in a patient with HIV infection on antiretroviral therapy with protease inhibitors boosted with ritonavir, after the association of inhaled fluticasone. This clinical case highlights a relevant interaction between corticosteroids and inhibitors of the cytochrome P450 and the severe consequences that may occur.

Topics: Administration, Inhalation; Adult; Bronchodilator Agents; Cushing Syndrome; Drug Interactions; Fluticasone; HIV Infections; HIV Protease Inhibitors; Humans; Iatrogenic Disease; Male; Osteonecrosis; Pulmonary Disease, Chronic Obstructive; Ritonavir

We report a case of severe bilateral knee avascular necrosis in a HIV-positive man receiving ritonavir and inhaled fluticasone. This case highlights the need for a thorough medication history in patients on ritonavir-based antiretroviral therapy, especially where multiple prescribers are involved in the patient's care.

Topics: Administration, Inhalation; Adrenal Cortex Hormones; Adult; Androstadienes; Drug Interactions; Fluticasone; HIV Infections; HIV Protease Inhibitors; Humans; Magnetic Resonance Imaging; Male; Osteonecrosis; Ritonavir; Treatment Outcome