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Seventy percent of postmenopausal women experience vasomotor symptoms, which can be highly disruptive and persist for years. Hormone therapy and other treatments have variable efficacy and/or side effects. Neurokinin B signaling increases in response to estrogen deficiency and has been implicated in hot flash (HF) etiology. We recently reported that a neurokinin 3 receptor (NK3R) antagonist reduces HF in postmenopausal women after 4 weeks of treatment. In this article we report novel data from that study, which shows the detailed time course of this effect.Randomized, double-blind, placebo-controlled, single-center, crossover trial of an oral NK3R antagonist (MLE4901) for vasomotor symptoms in women aged 40 to 62 years, experiencing ≥7 HF/24 hours some of which were reported as bothersome or severe (Clinicaltrials.gov NCT02668185). Thirty-seven women were randomized and included in an intention-to-treat analysis. To ascertain the therapeutic profile of MLE4901, a post hoc time course analysis was completed.By day 3 of treatment with MLE4901, HF frequency reduced by 72% (95% CI, −81.3 to −63.3%) compared with baseline (51 percentage point reduction compared with placebo, P < 0.0001); this effect size persisted throughout the 4-week dosing period. HF severity reduced by 38% compared with baseline by day 3 (95% CI, −46.1 to −29.1%) (P < 0.0001 compared with placebo), bother by 39% (95% CI, −47.5 to −30.1%) (P < 0.0001 compared with placebo), and interference by 61% (95% CI, −79.1 to −43.0%) (P = 0.0006 compared with placebo); all continued to improve throughout the 4-week dosing period (to −44%, −50%, and −70%, respectively by day 28, all P < 0.0001 compared with placebo).NK3R antagonism rapidly relieves vasomotor symptoms without the need for estrogen exposure.