Some commonly prescribed medicines interact with certain medicines used for HIV infection. These include corticosteroid inhalers, nasal sprays and intra-articular injections. If a corticosteroid is necessary, beclometasone is a safer option as it is less dependent on CYP3A metabolism.
The MHRA has issued a Drug Safety Update about cobicistat, ritonavir and corticosteroids.
Interactions can be checked using this website.