morphine not helping my pain

The medical oncologist gave me morphine sulfate ER 15mg yesterday because percocet wasn't working enough anymore, but the morphine isn't so great either. After 8 hours I had to take a norco and there is still pain enough to keep me from thinking about anything else. I can only take the morphine every 12 hours. Does it build up effectiveness, or is this as good as it's going to get? Will a stronger pill last longer? I have one lesion, Stage 2. It really hurts.

[Paderla Anitha, DNB]

Hello and hope you are doing well.

Understand your predicament. Taking morphine over time does not build up its effectiveness, in fact you may develop tolerance and the effectiveness may reduce. Other options would be oxycodone or duragesic patch. Consult your doctor for long acting pain killers.

Hope this helped and do keep us posted.