I'm so glad you figured this out before you took any more pills. I would just say you probably shouldn't flush the pills. Call the pharmacy and see if they can dispose of them safely. We don't need this toxic to end up in our drinking water. I hope you feel better soon!
You are fortunate that you only ingested one pill. I can identify with the hallucinations, I had quite a conversation with my dead father while on this stuff. Let's all hope you are one of the fortunate ones who caught it quickly enough to avoid the all too common outcome. I wish you well.
I can't believe the cost of poison these days, that is outrageous. Also, if you can't dispose of the poison properly, see if you can get a doctor of your choice to take them himself/herself.
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