[susanpesek]

You are SO right! And this is one of several good places to post your question. I am ashamed that I assumed to know without looking this information up for you. I hate when I do that. I hope one of the other members will see this and speak to your question! Anyone?

From webmd:

Your doctor will adjust the dose to find the best dose for you. Use this medication regularly and exactly as prescribed in order to get the most benefit from it. To help you remember, take it at the same time(s) each day.
This medication is usually taken for only a few weeks at a time. It should not be taken with other appetite suppressants (see also Drug Interactions section). The possibility of serious side effects increases with longer use of this medication and use of this drug along with certain other diet drugs.
This medication may cause dependence, especially if it has been used regularly for an extended time or if it has been used in high doses. In such cases, withdrawal reactions (e.g., depression, severe tiredness) may occur if you suddenly stop this drug. To prevent withdrawal when stopping extended/regular treatment with this drug, gradually reduce the dosage as directed. Consult your doctor or pharmacist for more details, and report any withdrawal reactions immediately.
Rarely, abnormal drug-seeking behavior (addiction) is possible with this medication. Do not increase your dose, take it more frequently, or use it for a longer time than prescribed. Properly stop the medication when so directed. This medication may stop working well after you have been taking it for a few weeks. Talk with your doctor if this medication stops working well. Do not increase the dose unless directed by your doctor. Your doctor may direct you to stop taking this medication.

And from docguide.com: Some people who have taken Phentermine for a long time may develop a need to continue taking it. People who take high doses ae also at risk. This is known as dependence or addiction. If you stop taking Phentermine suddenly, you may have withdrawal symptoms. These may include extreme tiredness, mental depression, trouble sleeping, irritability, or mental, mood or personality changes.