I would bet that it is Neurontin, there are warnings all over the label to immediately alert medical personnel that you are taking it. That makes you kind of paranoid when you are taking it.
As for the chest pain, I know GURD can cause it. Can also be a sign of a pulmonary embolism. So depending on test results, he may just be in the hospital and they decide it wasn’t a coreonary event.
Neurontin is a non-assimilated synthetic amino acid—that’s it. It has anti-seizure properties which initially were used as joint therapy with a standard anti-seizure medication like Dilantin or carbemazepine. Neurontin as such has class labeling you speak about, because it is usually used in combination with more serious central nervous system agents. By itself, it is one of the safest agents ever developed and grossly misrepresented- it would be ideal for elderly because it is majorly not metabolized by the liver. In Rush’s case, which he has talked about at length on the air, he has a back condition which could be surgically corrected but with very poor chance it would be improved. As with everyone in the country taking pain meds, you have to worry about habituation— because these things work on the brain receptors and can be chemically addicting. I hope he didn’t have a relapse of his abuse- which at a certain dosage would cause heart problems-increased rate, palpitations, rhythm issues, etc.