Why taking Phetermine makes you sleepy?

Question

I started taking phentermine and it makes me so sleepy. Why does this happens? What could I do to change it?

Answer 1

I have the opposite effect with mine. Then again, I take it later in the day.Between 2-4pm. I usually am up later, but I dont have that scary rush type of energy, just the 'not tired' feeling.What time do you take it?Maybe if you took it later in the day?

Answer 2

It is just a side effect, see here http://amphimed.com/2008/08/phentermine....

Answer 3

It is just a side effect and nearly all medicine do this because we need the sleep for it to work in our body and once it hit the blood stream our brain tells us to get sleepy and if you have problems with Phentermine, then take it before bedtime ^_^