Jonas's parents recognize the beginnings of the Stirrings in Jonas when he tells of the dream in which he attempts to convince his friend Fiona that she should remove her clothing and allow him to bathe her, as he had bathed someone in the House of the Old. Jonas doesn't understand completely why he had this dream, but does describe the strongest emotion he connects with it as "wanting."
The antidote to the Stirrings is the daily pill taken by all citizens from the time they first experience the Stirrings until they are old. Jonas's mother explains that this medication will remove the disturbing emotions and erase any memory of the dreams that might cause such undesirable feelings. In a society based on Sameness and tranquility, obviously it is important to have a way to eliminate such undesirable emotions, so she emphasizes the importance of remembering to take the pill every day.
But you mustn't forget. I'll remind you for the first weeks, but then you must do it on your own. If you forget, the Stirrings will come back. The dreams of the Stirrings will come back.