Hello Maura,
I have taken ibuprofen in the past. My GP had prescribed the 800 mg slow release ones before knowing exactly what was wrong with me and I used to take one at night. The rheumatologist prefers me on Feldene. I too find it less effective and it actually only really works in cases of extra inflammation rather than overall pain. The most effective for me was celebrex which isn't prescribed to "young" people (it's not reimbursed unless you're over 60 I think) here and it seems they don't like it in general anymore.
I think ibuprofen is often avoided as it is not really the best med for the kidneys, so anyone who has kidney problems or who may be at risk of them (lupus patients in general) is often told to stay away from it.
What does your rheumatologist say about it? Have you thought about putting in a call to him/her to find out? Maybe your disease activity in general is simply not under enough control. From your previous posts I'd say that may be the case. Really the only person who can tell you if they think it is safe (as they know all your symptoms and test results) is your rheumy.
sorry I can't be of more help,
:hug:
Katharine