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Is it safe to take a laxative while on fentanyl patch?

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I had tubal ligation on friday last week. I was put on fentanyl because of the extreme pain I've been going through. My surgeon told me to use stool softer but it hasn't made me defecate. I haven't passed a bowl movement in a few days. I haven't been eating much though since my surgery, mainly soup and broth because it's hard to push and I don't want to cause myself problems. I've tried eating yogurt to help put friendly bacteria in me but I don't want to go on days without passing a bm. I was told the fentanyl causes constipation. It's a holiday so my gyno's office is closed, I can't get a hold of him to find out if it's okay to take a laxative like magnesium citrate is what I was thinking of. Safe or no? Would a laxative be too straining on my insides from the surgery? I drank a bottle of magnesium citrate the day before my surgery as directed from my surgeon.