As a medication, lysine is used probably most commonly in the treatment of herpes simplex labialis, better known simply as herpes or cold sores. It works best as a preventative option, although it can reduce how long an outbreak lasts.
Anisocoria is a condition in which the two pupils of the eye are different sizes; in other words one pupil is larger than the other. In some cases, the abnormal pupil may be the one that is smaller and in other cases the abnormal pupil may be the one that is larger.
In some cases, dilated pupils may be a symptom of a serious or life-threatening condition that should be immediately evaluated in an emergency setting. Examples include: Brain aneurysm (life-threatening bulging and weakening of the wall of an artery that can burst and cause severe hemorrhage). Brain tumor.