Original Web Novel work in Japanese (keeps updating)

https://ncode.syosetu.com/n9636x/?fbclid=IwAR1GDAic4JsC2VlGE0jfTqt2he-PQrngK1h3jOaQ0cycVUic0D0GWSJIJaE

Official Manga UP! monthly manga chapters Square Enix Ver.

https://global.manga-up.com/manga/164

https://mangadex.org/title/e18fe8c6-f6dc-4f05-8462-7b2083ff9a6c/kusuriya-no-hitorigoto

Official GX MANGA CHAPTERS

薬屋のひとりごと～猫猫の後宮謎解き手帳～ Sunday Web comic

Free but unofficial source for the manga: Manga Dex (Try to only read official sources please)

NOVELS IN ENGLISH OFFICIAL TRANSLATIONS

Light Novel Official Ebook purchase

https://j-novel.club/series/the-apothecary-diaries

Internet Archive Novel Uploads (up to vol 11)

https://archive.org/details/the-apothecary-diaries-light-novel-series

Light Novel

Translations on PDF up to Volume 13 (for now) https://jnovels.com/the-apothecary-diaries-light-novel-pdf/