The generally accepted therapeutic blood level for Digoxin is between 1 to 2 nanograms per milliliter.
This concentration range is targeted to maximize the drug's efficacy in treating conditions like heart failure and atrial fibrillation, while minimizing the risk of toxicity.
Levels significantly above this range increase the likelihood of adverse effects, whereas levels below may not provide the desired therapeutic benefit.
For calculation and units, the range is represented as:
$1 \text{ ng/ml} \le \text{Digoxin Level} \le 2 \text{ ng/ml}$