If I cancel my pre-booked drug follow-up appts, will they be added to the follow-up required list?

Simply cancelling the appts will not have them added to the follow-up required list. But in some scenario's it is possible:

For example:
A patient booked an appt and received the first dose of Twinrix Rapid, and you booked the 3 follow-up appts automatically at that time. So you now have 4 appts:

#1 - 0D - 1 of 4 (dispensed)
#2 - 7D - 2 of 4
#3 - 21D - 3 of 4
#4 - 1Y - 4 of 4

You now decide you want to cancel these appts and use the follow-up required list instead so the patient can book their own appt.

You can cancel appts #3 & #4, and reschedule #2 if needed. Once you dispense the drug in the appt for dose #2, it will trigger appt #3 to be added to the follow-up required list. Then once dose #3 is dispensed, it will do the same for dose #4.