The Apothecary is a large geometric building on the right side of the island. It operates as a hospital, psych ward, pharmacy, and therapy complex for the islanders. It is run by Marei Mauez and contains the prose engine.
At the beginning of the island (around patch 0.0.2) the Apothecary was first organized by Marei and Septrica. It was first a volunteer effort to gather "rape prevention squads" as rape was rampant in the first years. The Apothecary also created the False Moon after testing with inflated objects and how the island affects them.
There are also pamphlets made by the Apothecary (found in Red's cottage) that advertises their services such as Snuff Therapy and Ass-sisted Suicide.