NCIt definition : The chloride hydrochloride salt form of fosnetupitant, a prodrug of netupitant, a
selective neurokinin 1 receptor (NK1R; TACR1) antagonist, with potential antiemetic
activity. Upon intravenous administration, fosnetupitant is converted by phosphatases
to its active form netupitant. Netupitant competitively binds to and blocks the activity
of NK1Rs in the central nervous system (CNS), by inhibiting binding of the endogenous
tachykinin-derived neuropeptide substance P (SP) to NK1R. This prevents delayed emesis,
which is associated with SP secretion. This may prevent chemotherapy-induced nausea
and vomiting (CINV).;