Several opioids such as butorphanol and buprenorphine exhibit a limited effect of analgesia regardless of the dose that is administered. This is a phenomenon called the ____________ effect.

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The ceiling effect refers to the phenomenon where increasing the dose of a drug does not increase its effect beyond a certain point. This is observed with certain opioids like butorphanol and buprenorphine, where there is a limit to the analgesic effect that can be achieved regardless of dose increases.

Several Opioids Such as Butorphanol and Buprenorphine Exhibit a Limited