Abstract: A douche apparatus for attachment between a shower head and its water supply pipe. The apparatus has a manual valve for diverting water from the shower head to a lateral passage leading to the mixing head of a container assembly holding a liquid douche medicament. The mixing head has a venturi passageway into which the douche medicament is drawn up through a siphon tube by the flow of water through the venturi passagway. An adjustable flow control device controls the rate at which the medicament is drawn into the mixing head. A rotatably adjustable fitting attaches the mixing head to the valve so that the siphon tube in the container assembly can be positioned vertical. A douche applicator receives the mixture of water and medicament from the mixing head.