Question about missing one dose of Finasteride

[Adam4210]

I may get my 2nd supply of Finasteride later than I expected. I normally should have gotten it by now, but because of a stupid billing error it might come 1 day after I am out of Finasteride. How much harm will missing one daily dose of Finasteride do? I can pay an extra $15 to get it in time, but I was wondering if it was needed. If missing one dose has the possibility of doing any damage I will pay the $15 no problem.