It is common for one's body to become used to any medication and not be as effective as it once was. Typically doses should be monitored on a six monthly basis and re-evaluated if necessary.
In these instances, it is recommended to speak with your prescribing doctor about the efficacy of your current dosage and allow him/her to determine the best course of action.
I am not familiar at all with the other two medications you have mentioned and therefore cannot comment on them.
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