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★☆☆Contested — the evidence disagrees with itself, or the finding carries a caution. A caution or conflict always shows one star, however strong the sources are.
Bowel ischaemia after phenylephrine appears in three published cases
Of 18 published cases of ischaemic colitis after an oral decongestant, 3 involved phenylephrine, and all 18 recovered. Case reports cannot show the drug caused it.
What the study found
Three published cases of bowel ischaemia followed phenylephrine use
A search of cases published from 1995 to 2021 found 18 people whose large bowel lost part of its blood supply, called ischaemic colitis, after taking an oral decongestant: 3 on phenylephrine, 15 on pseudoephedrine. All 18 recovered, one after surgery. The reviewers call it rare but real.
The caveat · Only unusual cases get published
Case reports cannot show that the decongestant caused the colitis. Unusual cases are the ones that get written up and published. With 3 phenylephrine cases, no rate can be worked out.