Welcome to the community 😀
I have tried Infliximab in the past, and for me, the only side effect was being super tired, and a little achey on infusion day, and for a day or two after. I've heard people say that they can feel it for up to a week, and others experience things like headache too.
Usually, the first few treatments will be administered slowly, to ensure there's no adverse reaction - how long that will take differs between hospitals. Then the infusions can be administered more quickly one it's clear that you tolerate it well. Again, how much time it actually takes will differ from hospital hospital.
Many people call it their "wonder drug", as it helped ease their symptoms where other treatments have not, but it is important to understand that everyone with IBD is different. There is no one size fits all answer. All you can do is hope that it helps your symptoms, and quickly! 😀
When on Infliximab, things like avoiding contact with people who have infections/bugs is important, as your immune system is being suppressed by the treatment. It's also recommended that you have a flu jab every year, and wear sunscreen to protect your skin - factor 50 is preferable.
Good luck!
- Sahara (team member)