Triggering (Substance Abuse) - when is it classified as substance abuse?

[-Shae-Lynn*]

When does taking medicine turn into substance abuse?
I've been taking medicine not what it is meant for to be able to sleep but in pretty close to the right dose.
How do you classify it?

[RazorKissBrad]

overindulgence in and dependence of a drug or other chemical leading to effects that are detrimental to the individual's physical and mental health, or the welfare of others.

[jsthoping]

if it was me ..."a self-harm"....try warm milk