Which drug is an opioid analgesic?

Oxycodone Hydrochloride is classified as an opioid analgesic, which means it is specifically designed to relieve pain by engaging with opioid receptors in the brain and spinal cord. Opioid analgesics, such as oxycodone, are effective for managing moderate to severe pain due to their potent action on the central nervous system.

In contrast, the other options listed do not serve as opioid analgesics. Meloxicam is a non-steroidal anti-inflammatory drug (NSAID), primarily used to reduce inflammation and pain. Escitalopram is classified as a selective serotonin reuptake inhibitor (SSRI), predominantly used to treat depression and anxiety rather than pain. Diltiazem Hydrochloride is a calcium channel blocker, commonly prescribed for conditions such as high blood pressure or certain heart conditions, not for pain relief.

Therefore, the selection of oxycodone Hydrochloride as the opioid analgesic is accurate based on its classification and intended therapeutic use in pain management.