Which of the following drugs should never be used for euthanasia?

Phenobarbital is often considered the correct choice in this context due to its specific role and mechanism of action. While it is used for euthanasia in many veterinary practices because of its ability to induce deep anesthesia and respiratory depression, there are critical factors to consider regarding its use.

For euthanasia, drugs must be administered in a manner that ensures a peaceful and humane death without causing distress or suffering to the animal. Phenobarbital, when used correctly, can achieve these goals effectively. However, it is essential to note that it is also a drug that may have potential for misuse or complications if used inappropriately. The ethical implications of employing any medication for euthanasia are significant, and veterinarians must adhere to legal, ethical, and professional guidelines.

In contrast, other options such as fentanyl, acepromazine, and ketamine either do not serve as appropriate agents for euthanasia or may lead to complications that do not ensure a humane process. For example, fentanyl is a potent opioid used primarily for pain relief and does not induce death on its own. Acepromazine, an anesthetic, may not provide the necessary depth of anesthesia required, and ketamine, while an anesthetic, poses risks of dissociative effects