phentermine is a great pill for weight loss & energy in the beginning, but i feel that my body becomes immune to it & no longer works. I do also get the B12/myoden shots as well to help with energy. If you read the side effects there is a whole list, but the most common are the dry mouth, insomnia, and constipation. You can get it in different mg's or try taking the whole pill in the morning or half in the morning half before dinner.... if you aren't sleeping, try taking it earlier in the day or only half a pill... or ask your doctor for a lower dose.
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