What are the best answers for “a long-acting barbiturate used as a sedative”?

luminal, phenobarbital, phenobarbitone.

How many letters does the top answer for “a long-acting barbiturate used as a sedative” have?

The most common answer is luminal (7 letters).

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

luminal 7 letters wn-def

a long-acting barbiturate used as a sedative

phenobarbital 13 letters wn-def

a long-acting barbiturate used as a sedative

phenobarbitone 14 letters wn-def

a long-acting barbiturate used as a sedative