Buprenorphine is an opioid analgesic that is considered to have both agonist and antagonist opioid receptor effects, which allows for the benefit of providing a long duration of effect with fewer adverse effects compared to other drugs in this class. Buprenorphine exhibits agonistic activity at the ___________ receptor, and antagonistic activity at the _____________ receptor.
Selecciona una de las siguientes respuestas posibles: