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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.
If phenibut is helping you, then keep using it but exercise caution (use twice per week, not three times per week). Ask your doctor for gabapentin or pregabalin. They can help with withdrawal for phenibut so that if you ever do mess up and go four days on, you'll have something to bring you easily back to baseline.