I decided to plot a graph of drug exposure over the top of my alcohol/GGT graph.
The Rivaroxaban and the Bisoprolol do not seem to be having much of an effect; I experienced a trough in GGT while on both of them. The peak after Xmas would appear to match a rise in alcohol use, and there is a corresponding dip to April after becoming teetotal. This did not continue in July and November, which may correspond to the introduction of Amiodarone, which is only just leaving my body now. I will continue to monitor the Amiodarone line with respect to GGT.