Slightly reduced effect for a short while after resuming normalcy. Take your next dose as soon as possible and resume as normal.
Source: My 10 year old son is on atomoxetine. According to the doctor, missing a dose isn’t that bad, just take it ASAP- atomoxetine works by having a certain buildup over time.
I asked the doctor once about pausing the meds, and she was against it, because the side effects could come, even some that weren’t present before. It was better to stay on them constantly.
MY conclusion is therefore that it is probably better to stretch your meds (consistent lower dosage for a period) to avoid a complete cutoff. Note: I’m an IT dude and a random person on the internet, and have no medical qualifications.