Have Medical Questions? Ask a Doctor Online!
Phentermine is taken in 2 divided doses.
The total daily dose should not exceed 75 mg.
The medication does lose its strength after one year of date of manufacture.
So the medication may now be about half the strength.
Also there is risk of allergic reaction also from chemical decomposition.
So better to get a new prescription after discussing with your doctor.
Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the smiley faces) under this chat box only.Please bookmark my profile for asking further questions!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/