Final answer:
The best indicator of a decrease in pain intensity for a client post-surgery is the statement "The pain is more tolerable now," as it directly reflects an improvement in pain levels without confusion from potential side effects of opioids like morphine and oxycodone.
Step-by-step explanation:
The student is asking about how to evaluate a client's decrease in pain intensity following the administration of an opiod analgesic after a total hip arthroplasty. When examining the client's statements, the best indicator of a decrease in pain intensity would be the client stating, "The pain is more tolerable now." This directly reflects an improvement in the client's perception of pain. Other options such as feeling drowsy, pain worsening, or tingling in toes do not accurately indicate a reduction in pain levels and may actually reflect potential side effects or other issues. Opioid analgesics like morphine, oxycodone, and codeine (often combined with acetaminophen) are commonly used for moderate to severe pain management, with careful monitoring required due to risks of dependence and other side effects.