Just a once off high dose should not have caused any adverse effects. I hope you didn't experience too many side effects.
The usual overdose symptoms are :
Seek emergency medical attention if you think you have used too much of this medication. An overdose of phentermine can be fatal.
Overdose symptoms may include confusion, hallucinations, feeling restless or aggressive, nausea, vomiting, diarrhea, stomach pain, irregular heartbeat, tremors, rapid breathing, confusion, hallucinations, feeling light-headed, fainting, or seizure (convulsions).
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