How long before a psychiatric medication actually works?

The most common reason people stop a medication too early is that nobody told them how long to wait.

Antidepressants are the classic example. Sleep and appetite often shift in the first one to two weeks, while mood and interest usually take four to six. Judging the medication at day ten is judging it before it's finished arguing its case.

Stimulants are the opposite — you'll know within a day or two, which is why the first few weeks are mostly about finding the right dose rather than waiting for an effect.

Mood stabilizers sit in the middle, and several require blood levels, which means the timeline includes lab work.

What matters most is agreeing in advance on how we'll measure improvement, and when we'll reassess. Write down two or three concrete things you want to change. That's a far better yardstick than trying to remember how you felt a month ago.