Multiple choice Among the following _____________ is a/an short-acting barbiturate . phenobarbital pentobarbital secobarbital amobarbital Reveal answer Fill a bubble to check yourself B Correct answer Explanation Pentobarbital is a short-acting barbiturate that was first synthesized in 1928. Pentobarbital is available as both a free acid and a sodium salt, the former of which is only slightly soluble in water and ethanol.