From all the reading i've done I can say within 99.9% certainty that it will not matter at all. Right out of an ncbi study:
[FONT=arial, helvetica, clean, sans-serif]"Scalp skin DHT levels declined significantly by 13.0% with placebo and by 14.9%, 61.6%, 56. 5%, 64.1%, and 69.4% with 0.01, 0.05, 0.2, 1, and 5 mg doses of finasteride, respectively. Serum DHT levels declined significantly (P <.001) by 49.5%, 68.6%, 71.4%, and 72.2% in the 0.05, 0.2, 1, and 5 mg finasteride treatment groups, respectively".[/FONT]
[FONT=arial, helvetica, clean, sans-serif]As the science shows, any dose >0.5mg suppressers a pretty good amount of DHT in the scalp. Don't worry about it, keep up with the treatment and best of luck. Cheers.[/FONT]