Eye drops should not be used after 4 weeks after opening. Eye drops should not be used for more than 4 weeks after opening. Eye drops should be discarded after 4 weeks of opening, even if they are not used up. Eye drops are liquid medicines, the stability is relatively poor, after opening the cap, due to contact with the air, it is easy to physical and chemical changes, which may lead to eye drops failure, and even produce harmful substances, causing harm to the eyes.

Eye drops without preservatives, which have a short expiration date, are recommended to be used within a week after opening. Don't put our eyes at risk by considering the economic cost. It is also reminded that family members should not use eye drops on each other to avoid cross infection.

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/health.people.com.cn/n1/2017/0509/c404177-29263776.html "target="_blank" title="People's Daily - eye drops can only be used for 4 weeks after opening your eye drops are really stored right?" > People's Daily - eye drops can only be used 4 weeks after opening your eye drops really stored right?