Charlie is taking 100mg of Gabapentin every 8 hours in a capsule form.
His vet sourced 200mg cimitidine tablets, round in shape that are more easily divided in quarters. So he takes 1/4 tablet twice a day several hours after Gabapentin just to be on the safe side. Both pills are either wrapped in cheese or covered in butter probably not the best for his arteries.
He's doing so much better now thanks to the excellent advice I've received on this site. Thanks to all.