Dose-response

A dose-response relationship means that more of something is linked to more of an effect. As the dose goes up, the response changes in step.

This term is specific to research interpretation and is defined on AnxietyResearch. Shrinktionary, the network's language layer, doesn't currently carry a canonical entry for it.

Dose-response is a classic sign that a link might be causal. If a small dose produces a small effect, a medium dose a medium effect, and a large dose a large effect, that pattern is harder to explain away as coincidence. The dose doesn't have to be a drug. It can be the number of therapy sessions or the length of a program.

Dose-response thinking helps judge both medication and therapy. For therapy, researchers ask whether more sessions produce more improvement, and whether there is a point where extra sessions stop adding much. For medication, they ask whether higher doses help more, or only add side effects.

A study of CBT for anxiety finds that people who completed more sessions had larger improvements, up to a point, after which extra sessions added little. That's a dose-response pattern with a plateau.

A dose-response pattern supports a causal link but doesn't prove one. People who attend more therapy sessions may differ in other ways, such as motivation or access. And more isn't always better. Many treatments reach a ceiling, and higher medication doses often raise side effects faster than benefit.