Ritonavir or lopinavir/ritonavir significantly enhance plasma concentrations of oxycodone in nutritious human volunteers on account of inhibition of CYP3A4 and CYP2D6.[58] Rifampicin drastically decreases plasma concentrations of oxycodone as a result of sturdy induction of CYP3A4.drugs that make you sleepy or gradual your respiratory - a sleeping … Read More