The clinic i go to gives both out, either phentermine or phendimetrazine. Phendimetrazine 30 mg is taken 3x a day before meals. phentermine 37.5 mg once a day in the morning. Phendimetrazine is more expensive because there are more pills. From my experience, phentermine works better and it feels like it is stronger. The doctor gave me both. I start off by taking phentermine in the morning and on some days maybe 6 or 7 times a month before my period when i feel more tired and hungry and take 1 phendimetrazine around lunch. Taking both really kills your appetite. However i dont do that on a daily.
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