"Dr." received mixed reviews from most
music critics. On a positive note, Japanese magazine
CD Journal commended the tracks arrangement, Amuro's vocal deliveries, and its status as being a single. As part of the album, the magazine complimented the tracks lyrical content and Nao'ymt's "futuristic" production. Tetsuo Hiraga from
Hot Express heavily lauded the track, describing it as her own "
Bohemian Rhapsody". He also complimented the tracks sense of prosperous, in terms of genre development with her future music. Commercially, "Dr." was a success in Japan. Charting with "Wild", the single debuted at number one on the
Oricon Singles Chart, selling 75,456 copies in its first week. This resulted in being her eleventh overall number-one single, her second consecutive number-one, and essentially her first single to debut atop of the Oricon charts since her 1998 single "
I Have Never Seen". Additionally, "Wild" and "Dr." are her last singles to reach number one in Japan. Overall, the singles ranked in the charts for 17 weeks, and sold a total of 119,352 copies in the region. It was ranked at number 45 on Oricon's yearly chart. As a stand-alone track, "Dr." debuted at number 64 on the
Japan Hot 100 chart, provided by
Billboard, and peaked at 39. The song was certified in two different categories—physical sales and ringtone purchases—by the
Recording Industry Association of Japan (RIAJ) for separate sales of 100,000 copies. ==Promotion and live performances==