How many letters does the top answer for “the art and science of preparing and dispensing drugs and medicines,” have?

The most common answer is pharmaceutics (13 letters).

Crossword clue: the art and science of preparing and dispensing drugs and medicines,

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

pharmaceutics 13 letters wn-def

the art and science of preparing and dispensing drugs and medicines,

the science of preparing medicines. 50% similar → pharmaceutics