why do they have to take medication?

They have to take medication to subdue any sexual urges they might have.

They have to take medication to get rid of the feelings they have

They have to take medication to get rid of they feelings they had

The medication will wither away any feelings that the people may have about love, or pain. In reality, the feelings the medicine is dulling are really basic human feelings, but they don't know that because they have to take the pill and the chief elders don't let them know.