Tennessee Execution Drug Faces Renewed Scrutiny After Botched Lethal Injection
Pentobarbital, used in the failed execution of Christa Pike, has a history of controversy and was previously halted by the Biden administration for federal use.
The drug used in Tennessee's recent failed execution attempt, pentobarbital, has drawn scrutiny for its role in capital punishment. Christa Pike, 50, remained alive after two doses of the barbiturate were administered Wednesday, according to her attorneys and media witnesses.
Republican Gov. Bill Lee has ordered a third-party review into the incident and announced that another scheduled execution for this year would not proceed. Pentobarbital, a central nervous system depressant, is approved for medical uses such as sedation and seizure control, and is also used in veterinary euthanasia. In overdose amounts, it can cause coma, respiratory suppression, circulatory collapse, and death.
Historically, lethal injections often utilized a three-drug protocol: an anesthetic, a paralytic agent, and potassium chloride to stop the heart. This method faced criticism because the paralytic could mask a prisoner's pain if the anesthetic failed. Drugmaker restrictions on distribution for executions further complicated this approach.
The single-drug pentobarbital protocol gained prominence at the federal level during President Donald Trump's term. The federal death penalty protocol, similar to Tennessee's guidelines, specifies a 5-gram dose of pentobarbital, a significantly higher amount than typically administered in medical settings.
The federal government employed pentobarbital for 13 executions between 2020 and 2021, contributing to Trump's administration carrying out the most executions in over 130 years. However, the Biden administration's Justice Department halted federal executions using pentobarbital following a government review that cited concerns about potential "unnecessary pain and suffering." A subsequent review by the Justice Department in 2026 reauthorized its use.
Experts have raised concerns that pentobarbital can lead to pulmonary edema, a condition causing fluid buildup in the lungs that may induce a sensation of suffocation. A federal review concluded that significant uncertainty exists regarding whether pentobarbital as a sole lethal injection drug causes unnecessary pain and suffering, recommending that the government "err on the side of humane treatment." Conversely, other specialists cited in a report from the second Trump administration argued that a lethal dose induces unconsciousness prior to such effects.