Which intervention is considered non-pharmacological in pain management?

The correct answer is the use of heat therapy, as it is a non-pharmacological approach to managing pain. Non-pharmacological interventions focus on methods that do not involve medications to alleviate discomfort. Heat therapy involves applying warmth to affected areas to promote blood flow, reduce muscle tension, and alleviate pain. This technique can be effective for conditions such as muscle strains, stiffness, and chronic pain syndromes, providing relief without the potential side effects associated with medications.

In contrast, administering opioids, implementing nerve blocks, and prescribing antidepressants all involve pharmacological methods. Opioids are potent pain-relief medications that act on the nervous system, while nerve blocks involve the injection of anesthetic agents to disrupt pain signals. Antidepressants, though often used to address pain, are also medications that affect neurotransmitter levels to help alleviate various types of discomfort. These options do not fit the criteria for non-pharmacological strategies, making heat therapy the best choice for this question.