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RO6889678 + ritonavir is an **oral combination drug consisting of RO6889678, a small molecule hepatitis B virus (HBV) capsid inhibitor, and ritonavir, a small molecule CYP3A inhibitor**. Ritonavir is used here to boost systemic concentrations of RO6889678 by inhibiting CYP3A-mediated metabolism. The primary mechanism of RO6889678 is to interfere with HBV capsid formation, preventing viral replication. This combination was developed by Roche for the treatment of hepatitis B virus infection and investigated in healthy volunteers to assess pharmacokinetics, safety, and tolerability, as well as drug-drug interaction potential. According to available sources, **the development status for RO6889678 + ritonavir has been discontinued**[1][7].
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