In some cases, Prostagard 4 Capsule has shown specific side effect on the eyes. It has been observed that during an eye surgery the iris tends to get floppy and pupil size becomes small in patients taking Prostagard 4 Capsule. This makes the operation difficult and tedious. Hence, you should always inform your eye specialist about any history related to the use of Prostagard 4 Capsule. Also, the doctor should be informed about all the medication that you are on before starting the treatment.