Pinguicula medusa gets the same treatment as my other mexican pings.
They are planted in pots with a diameter of 9 cm (3,5 inch), which are located in a greenhouse.
They receive shadow during the warmest hours of the day.
The soil mix that i use is perlite : vermicultie : coarse sand in a ratio of 1:1:1 with a little bit of added peat.
In the summer i water them using the tray method, and let the pots stand in 2 cm of water, during the winter i keep the soil damp, but never let it dry out.
During the winter I keep them at 5 to 7 degrees celsius (41 to 44 degrees Fahrenheit)