I Take Aspirin Regularly For Back Pain And Muscle Soreness

I take aspirin regularly for back pain and muscle soreness (its the only thing that relieves the pain). I was prescribed relafen for my arthritis and have only taken it occasionally because of the aspirin. I just read that relafen won’t work for my arthritis unless I take it on a regular basis. I’ve a hunch mixing the two is a no-no.
I see I have to give my email address. I do NOT want to be on a mailing list. PLEASE don’t do that. Thanks.