Den anbefalede dosis af bupropion skal imidlertid ikke overskrides, fordi ritonavir også er vist at hæmme CYP2B6 in vitro.
Consequently, concomitant administration of ritonavir dosed as an antiretroviral agent or as a pharmacokinetic enhancer and these glucocorticoids is not recommended unless the potential benefit of treatment outweighs the risk of systemic corticosteroid effects (see section 4.4).