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This indicates that after youâve taken a gabapentin dose, approximately 50% will have been cleared from your system within 5 to 7 hours (on average). Using this information, we can determine that gabapentin will stay in your system for an estimated 1.15 to 1.60 days after your final dose. In other words, you shouldnât expect any of the gabapentin to remain in systemic circulation after 2 days (48 hours) post-ingestion.
cymbalta. 1  Yes well I know that when I was titrated off medications (under my psychiatrist's direction) the non specific flu like withdrawal symptoms (as they are called) lasted about a month if the titration was done at a faster rate but they always subsided in that time frame.