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I’ve never heard that. Seems an arbitrary number. Where did you hear this?
I have been taking it since 2009. Still works.
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Sometimes I think people can build a tolerance, even though doctors will say no. Sometimes meds do stop working. But it’s not in “X” years. It could be anytime, or never.
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I’ve heard that too n then they increase the dose
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I was on it for a long time and I never heard that