Patches de morfina para alívio da dor

Hi.
New to this forum as was wrongly diagnosed with PMR 13 years ago, now changed to rheumatoid arthritis. I am on sulfasalazine.

I have tried lots of different painkillers with little or no effect. I am now trying morphine patches, up to 20 mcg at the moment.

I wondered if anyone out there is using the same pain killer and whether they bring relief? And at what dosage?

Thanks, Irene