Answer
Phenylephrine in Beechams Flu-Plus Caplets has been associated with dysuria and urinary retention at an unknown frequency, most likely in people with bladder outlet obstruction such as prostatic hypertrophy.
Sources for this answer
- Beechams Flu-Plus Caplets GSLHaleon UK Trading Limited · emc · SmPC §4.8 Undesirable effects · Version 16Document updated
Sources checked