What does the medical abbreviation TD dosage mean?

There are several possibilities for what "T.D." would be a medical abbreviation for. The circumstances of how and where it is used would be the way one would know what it means.

Here are three main abbreviations used frequently:

(all capitals, "T.D" makes a big difference also rather than "t.d." or "T.d.")

Thyroid Deficiency

Tardive Dyskinesia

Total Dosage