Answer
The phenylephrine in Beechams Flu Plus Hot Lemon has been associated with dysuria and urinary retention, most likely in people with bladder outlet obstruction such as prostatic hypertrophy; their frequency is unknown but likely rare.
Sources for this answer
- Beechams Flu Plus Hot LemonHaleon UK Trading Limited · emc · SmPC §4.8 Undesirable effects · Version 13Document updated
Sources checked