OnlyMeDid,

I'll consider whatever is correct by definiton, since I tend to follow those sort of rules; I'm the annoying one.

Self-infliction, or self-harm, if you prefer, denotes damage, pain or harm to someone's own body, whether that be external or internal, should be irrelevant, ergo, yes, by definiton, taking more medication than you should be taking, would be SI. That said, it's only so, if it is harmful to you. If there is no harm, damage or anything else pertinent to 'SI' as a result of taking too many pills, then no, it is not SI.

Since you would not be overdosing on medication, there would be no significant damage, if any, respectively. Pills will of course vary, as do our bodies, meaning that you may be causing damage of any kind to yourself by taking "just like a half more", which BTW, I strongly recommend against, without first contacting your doctor.

To further shed some light on the subject:

The 'harm' in self-harm (SH) denotes physical harm, not emotional, psychological or any other none-physical form of harm. However, 'infliction' is slightly more versatile and can be either physical or otherwise. I wouldn't say this answers any questions, but it might help conquer any uncertainties anyone here may have.

I hope this helps.

Regards,
Akuma