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Does brimonidine tartrate really expire?

Hi,
I have been taking brimonidine tartrate ophthalmic solution 0.15% for the last 5 years. I had lasik surgery and had some halos around lights at night time. Doctor prescribed this medicine and it works. He gave me a few bottles and after sometime of taking it it was expired. I only take it a couple times a month.  Still worked for me and no problems. So my question is does it really expire or is it just for the makers to make money? I live in Japan and my doctor is in canada. They dont sell this medicine here.
Thanks.
2 Responses
2078052 tn?1331933100
MEDICAL PROFESSIONAL
This issue has been debated for some time.  While the effect of the medicine may not decline, the sterility cannot be assured years after the expiration date.  Most pharmacists I have asked say the drop is good for 6 months past the expiration date, as long as the solution is not discolored or was exposed to extremes of temperature.
Avatar universal
Thank you

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