Concerning hair loss: This only happens if you don't have enough protein
in your diet, and you are losing weight very fast at the same time.
You probably have nothing to worry about. 
About the neurotransmitters... I'm not exactly sure, but from what I've
learned, long term use of Phen (months-years) causes your body to
stop producing the same levels of neurotransmitters that it did previously.
I guess the levels just get low enough because of Phentermine slowing
production, and then it's rendered ineffective after a while.
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