title: Possible leukopenia associated with long-term use of echinacea.
mesh_terms: D020900:Echinacea / Q000009:adverse effects*; D005260:Female; D006801:Humans; D007970:Leukopenia / Q000139:chemically induced*; D008875:Middle Aged; D008517:Phytotherapy / Q000009:adverse effects*; D013997:Time Factors