Hi i have recently had blurred vision. i have had phenergan (promethazine) infrequently for hay fever. i am wondering if it is the phenergan (promethazine).

Very possible: Stop the Phenergan (promethazine) and see your doctor in the next few days.

Could be, yes, maybe: Phenergan (promethazine) has anticholinergic effects that can also result in pupillary dilation. This can make the vision blurry under certain lighting conditions. Many drugs can have varying degrees of anticholinergic effects that result in sleepiness, dry mouth, redness, rapid heartbeat, sedation, and pupillary dilation. Besides pupillary dilation, Phenergan (promethazine) can also cause even angle closure glaucoma.