Actually people with asthma are told that. If you take your inhaler 24/7 your asthma becomes worse not better. And if you refrain from using it except in emergencies you can actually get over your asthma - like my brother did.

As someone with depression this is also why i refuse to take SSRIs. It completely inhibits the development of coping mechanisms that could stop or stunt an episode to begin with. I've also seen the damage they can do to people (my mum for example literally goes psychotic and tries to kill herself) and there's no way I'm risking all that to deal with one depression episode that lasts less than a couple months.

Even working out the dosage takes longer than one of my episodes lasts and the dosage could very well make things worse not better. You can choose to rely on pills that permanently fuck up your brain or you can do what the other commenter suggested and change your environment to have the same effect.

I know what I'll choose.