Which drug would most likely be prescribed for pain management as an adjunct with NSAIDs?

The most appropriate choice for pain management as an adjunct with NSAIDs is codeine. Codeine is an opioid analgesic that works by binding to certain receptors in the brain and spinal cord to reduce the perception of pain, making it effective for moderate pain relief. When used in conjunction with non-steroidal anti-inflammatory drugs (NSAIDs), codeine can enhance pain relief through different mechanisms, allowing for a better overall management of pain.

In contrast, atypical antipsychotics are primarily used to treat conditions such as schizophrenia and bipolar disorder; they are not typically indicated for pain management. Carbidopa, on the other hand, is combined with levodopa for the treatment of Parkinson's disease and does not have analgesic properties. Selegiline is a monoamine oxidase inhibitor used in the management of Parkinson's disease and depression, but it is not utilized for pain relief. Therefore, codeine stands out as the most suitable option for adjunctive therapy in managing pain alongside NSAIDs.