You have lots of good questions relative to your decision to switch to DUT from low dose finasteride…the best truthful answers to any of them are: you won’t know how you will respond until you make the switch.
Yes you could have new or more side effects however it’s less likely because you have a long ingestion period with finasteride…the same goes with the possibility of an acute shed cycle, you may have some shedding but IMHO, not acute.
Most of the guys that I have dialogued with who have switched from FIN to DUT did not experience a drastic difference, a small percentage of them felt it made a huge difference in curbing their hair loss but most of them just maintained which was still a success…thicker hair?…nothing that was noticeable.
In all honesty, we are lay people so your questions regarding the best path to make the transition regarding dosage and frequency of ingestion can only be answered by a licensed physician, a hair loss specialist who is experienced with the medicinal treatment side of hair loss.