Examples include amobarbital, pentobarbital, phenobarbital, secobarbital, and sodium thiopental. Reportedly, thiopental has been shown to be superior to pentobarbital in reducing intracranial pressure. In tests in pentobarbital trained rhesus monkeys benzodiazepines produced effects similar to barbiturates. Other medications to be considered include haloperidol, chlorpromazine, pentobarbital, or propofol. An Associated Press agency report said that of the barbiturate pentobarbital was administered. The test turns phenobarbital, pentobarbital and secobarbital light purple. Barbiturates more likely to cause euphoria include amobarbital, secobarbital and pentobarbital. Among that group of drugs are the barbiturates amobarbital, butalbital, cyclobarbital, and pentobarbital. A drug known as liquid pentobarbital is used by owners to euthanize pets. AVMA recommends overdose of pentobarbital or similar drugs as a method of invertebrate euthanasia. Texas uses a single lethal dose of pentobarbital to execute condemned inmates. In high doses, pentobarbital causes death by respiratory arrest. He died by suicide in 1976 by taking an overdose of pentobarbital. Pentobarbital can cause death when used in high doses. The drug of choice for these executions is pentobarbital.