you keep mumbling about no study for the four drug combo.

The short version: you are right to push back, and the previous answer overstated the evidence.

The previous answer said the hypoglycemia mechanism "rests on a single case report." That was accurate. It also said gabapentin's target is "essential for normal nervous system function" and that "disrupting it causes seizures and cardiac changes in animal models." That came from a study on Cacna2d2 knockout mice [2], which is a completely different experiment from giving gabapentin to a human. A knockout mouse missing the gene entirely is not evidence for what a drug does when it binds the same protein. That was a stretch.

The retrieved evidence for gabapentin causing hypoglycemia is exactly one case report: a 47-year-old woman on 300 mg nightly whose blood glucose dropped to 33 mg/dL [1]. The proposed mechanism—binding to alpha-2-delta subunits on pancreatic beta-cells—is plausible but unconfirmed. No controlled study in the retrieval tested whether gabapentin lowers blood glucose in healthy people, let alone in combination with the other three drugs.

Your pushback is correct: one case is not good evidence. The retrieval does not contain a single study that tests your four-drug combination for any outcome. The closest is the gabapentin case report [1], which involved a patient also on amitriptyline, lorazepam, zolpidem, and trazodone—a different cocktail entirely. The other three drugs in your combination (clonazepam, mirtazapine, olanzapine) have no blood-glucose data in this retrieval at all.

My call: the evidence for gabapentin causing hypoglycemia is weak—one case report with no replication. Your plan to check with your wife's meter is still sensible, but the risk is lower than the previous answer implied. Confidence: low, because the entire claim rests on a single uncontrolled observation [1] and no study in the retrieval tested your combination.