Change in remicade frequency and dose

I've been on remicade for 7 yrs and it's starting to lose its effectiveness by the 8 week mark so my doctor is doubling my dose as well as changing my infusions from 8 weeks to every 6 weeks.
Is this normal for others who have had to change dose/frequency? I wonder why they don't change one or the other to start.
Anyway I didn't get the opportunity to ask the doctor so am
Looking for opinions of anyone who has been in this situation. Thanks in advance.

My boyfriends been on Remicade for the same amount of time as you and had to have his dose increased as well. He was at 400mg every 8 weeks and now he gets 600mg every 8 weeks. He's still not in remission quite yet so they are probably going to switch him to 600 every 6 weeks. The max dose seems to be 800mg at every 4 weeks. GI doctors usually dose based off your results from your Prometheus test. They dose it based off of how quickly your body is burning through the medicine.

It sounds like you're burning through the medicine relatively quickly but it isn't an uncommon dose change.