How many letters does the top answer for “a medicine or therapy that cures disease or relieve pain” have?

The most common answer is curative (8 letters).

Crossword clue: a medicine or therapy that cures disease or relieve pain

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

curative 8 letters wn-def

a medicine or therapy that cures disease or relieve pain

therapeutic 11 letters wn-def

relating to or involved in therapy