The eyes are particularly valuable and just as fragile. However, once opened, eye drops do not remain sterile for long. This is why these products expire quickly and can only be used for two to four weeks, depending on the case. No question of cheating with the deadline! Also, rather than relying on memory, it is strongly recommended to write the day of opening on the bottle. Safer, the majority of eye drops are now packaged in single doses … which must be used in a few hours.
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