oblong, blue-gray, scored on side without imprint. "f" looks like the f in Pfizer
I wonder if this is your pill - the 'f' is actually an R but the rest matches your description
Pill imprint R636 has been identified as Gabapentin 600 mg.
Gabapentin is used in the treatment of persisting pain, shingles; restless legs syndrome; peripheral neuropathy; pain; epilepsy (and more), and belongs to the drug class gamma-aminobutyric acid analogs.
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