Parallel World Pharmacy is a Japanese light novel series written by Liz Takayama and illustrated by keepout. It was serialized online from July 2015 to September 2023 on the user-generated novel publishing website Shōsetsuka ni Narō. It was later acquired by Media Factory, who published ten volumes from January 2016 to January 2024 under their MF Books imprint. A manga adaptation with art by Sei Takano has been serialized online via Kadokawa Shoten's ComicWalker website since November 2016. It has been collected in eight tankōbon volumes. One Peace Books licensed the manga adaption for English release in North America, with the first volume released in May 2023. An anime television series adaptation by Diomedéa aired from July to September 2022.