Does Cutting a Month of Proscar Really Lose Effectiveness?

Does cutting Proscar a month’s in advance really reduce its effectiveness?

Cutting a month of Proscar pills (5mg finasteride) in advance could reduce the effectiveness like any pill would if exposed to air and humidity for a prolonged period of time. I don’t know what the exact point is that the medication starts to degrade, but that’s why I suggest splitting one pill at a time. The protective coating on the outside is what extends the life of the medication, and a cut pill obviously loses some of that.