The official website for the anime adaptation of Natsu Hyūga and Touko Shino's light novel "The Apothecary Diaries" (Kusuriya no Hitorigoto) revealed that the anime will premiere on October 21st with the first three episodes airing all at once.
The Apothecary Diaries – Anime release date revealed
In addition, the site also revealed a new visual image and stated that the anime will have a duration of two cours (two quarters of the year).

The film is directed by Norihiro Naganuma , with a screenplay by Shinotoko and character designs by Yukiko Nakatani .
Synopsis:
The story takes place in a large country in the middle of the continent. Mao-mao is a young woman who works as a pharmacist in a Hanamachi (a neighborhood with many brothels). She is kidnapped and sold as a servant to the palace. But she hides the fact that she is a pharmacist; she works very quietly, waiting for the new year to arrive. One day, however, she hears a rumor from a coworker that the emperor's children are dying one after another, and using her knowledge of pharmacy, she discovers the cause.
Therefore, Kusuriya no Hitorigoto (The Apothecary Diaries) began its publication in October 2011 in Shousetsuka ni Narou and its physical publication began in August 2014.
Finally, the novel had two manga adaptations simultaneously, the first by Nekokurage published in Big Gangan and the second by Minoki Kurata published in Sunday Gene-X.
Source: Official Website
Read also:

