Simplify the following text for a Grade 13 native English-speaking person.
Original: He wrote several articles on the antidepressant qualities of the drug and he was influenced by friend and confidant Wilhelm Fliess , who recommended cocaine for the treatment of `` nasal reflex neurosis '' .
Simplified: In this period he came under the influence of his friend and confidant Wilhelm Fliess , who recommended cocaine for the treatment of the so-called `` nasal reflex neurosis '' .