Hi Daisy:
I agree with the points that Michael has provided. I have been actively involved in allergy drug development for a number of years. Both of these products are approved for temporary use to relieve symptoms of allergic conjunctivitis. While these products are generally safe to use for longer periods of time, they are used primarily used to treat short-term, seasonal conditions that generally are less than 3-4 months in duration (tree, grass, mountain red cedar, ragweed pollens, and fall moulds) or pink eye. With longer term usage, you may encounter class side effects associated with antihistamines in general (i.e. rebound, and very rarely keratitis). I would also be concerned with using the same bottle for a long period of time. The tip and the solution may become contaminated with bacteria and mould, which when introduced into the eye, will cause an infection. Both products are also classified as a Category C medications which restricts usage in pregnant or beast feeding mothers. Also, please note Michael's response with using these products with contact lenses. These products should not be used with contact lenses, especially the newer silicon based long-term lenses as the preservatives used may be absorbed by a soft contact lens and effect wearability. I do not know what the drug-drug interactions are with using these products with other ocular products used to treat conditions such as glaucoma or with using with a NSAID eye drop after cataract surgery, but wonder if this may be part of the max usage time. This may be something to consider.
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