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Hi..You’ve been on Dvenlor 50 mg for many years without issues, so it’s possible that the recent switch to the generic Zeelab 50 mg is causing your brain fog and irritability. Even though the active ingredient is the same, the way it's absorbed or the fillers used can affect how your body reacts, especially at your age. Some people are more sensitive to these changes, and it’s not uncommon to notice new symptoms after a brand switch.  other possible causes like dehydration, infection, or changes in sleep that could also be contributing for the present symptoms. However will need further history regarding the same to advise appropriately.