finasteride and thinning hair

If finasteride can not cause thinning, why am I continuing to thin while on finasteride?  I’m definitely not imagining this. Could it be that the dosage 0.5mg is not enough and the miniaturization is too aggressive?

Yes, it is possible that you need a proper dose of finasteride (1mg), or your thinning process is more active than the finasteride can manage.