Echothiophate Iodide, which is sold under the brand name “Phospholine Iodide”, is used to lower eye pressure and to treat children with strabismus (i.e. cross-eyed children) According to rxlist.com, Echothiophate Iodide works “by causing the pupil to shrink, decreasing the amount of fluid within the eye”. Make sure you tell your doctor about your allergies, or if you are pregnant or breastfeeding before you take this drug. You also need to drive carefully during your treatment, not to mention that you need to be extra cautious while doing other tasks that require clear eyesight. Plus, you need to wear a breathing mask when you are around certain insecticides and pesticides as they may cause more side effects. Speaking of side effects, Echothiophate Iodide can cause eye redness/irritation, headache, stinging, and burning. It may also cause more serious side effects such as shortness of breath, diarrhea, eyesight changes, abnormal heartbeat, and incontinence. (As mentioned on drugs.com) Be sure to call your doctor when you experience any of these side effects.