Finasterida 5mg vs finasteride 1mg

You don't think you have lost gains by taking pills of finasteride 5mg in quarters instead of pills of finasteride 1mg? My doctor told me the pills of finasteride aren't homogeneous, so you can cut the pill perfectly in quarters and you have, for example, 0,5+0,5+0,5+3,5mg of finasteride because the generic pill aren't homogeneous... What is your opinion about that? I'm thinking about that. I'm overthinking?