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The one eye I put the drop in was dilated for several hours as we...
| Posted at 8:20 PM on Aug 18, 2008 by conradagcy, #33579 |
The one eye I put the drop in was dilated for several hours as well after a breif bout with nausea. Within a half hour of putting in the drop.
The active ingredient pheniramine maleate has antihisitimine and vasoconstrictive properties working on alpha-adrenergic receptors in the eye. So it causes blood vessels in the eye to shrink (e.g. getting the red out), but as a side effect it also 'paralyzes' the smooth muscles of the iris causing the pupil to enlarge for some time.
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