Which of the following describes a full opioid antagonist effect?

A full opioid antagonist is designed to completely block the effects of opioid agonists at the receptor sites, which is particularly important in scenarios such as opioid overdose. One of the critical effects of opioid agonists is the respiratory depression they can cause, which can be life-threatening. Therefore, the primary function of a full opioid antagonist is to reverse this respiratory depression effectively. This action restores normal respiratory function in individuals who have overdosed on opioids, ensuring that they can breathe adequately.

While the other options mention various effects, they do not pertain to the primary purpose of a full opioid antagonist. For example, partial pain relief and the stimulation of appetite do not apply to antagonistic action, as antagonists do not provide analgesic benefits. Similarly, reducing inflammation is outside the scope of opioid antagonists, as they do not have anti-inflammatory properties. The key feature of a full opioid antagonist is its ability to reverse the potentially harmful central nervous system effects of opioids, making complete reversal of respiratory depression the correct characterization of their effect.