Some girls take Hydroxycut, but for me personally I don't. It makes me too jittery and really makes me feel strange. Then I have a huge thud when coming down off them, plus poor sleep. I believe it plays around with your nervous system and puts your body into the "fight or flight" response mode, which raises your cortisol levels.
Another thing that convinced me not to take them was what my coach said when I told him that the fat burners always gave me a loose tummy. He said "Of course it does, they raise your body temperature, which makes the food go off in your stomach. It's the same as leaving food in a bucket out in the sun... what do you think is going to happen?!" That mental picture alone was enough... LOL!!
It's a personal choice so you have to make the decision that's best for you, but mine is to not use them.
I would also get your blood pressure, etc. checked with a doctor before going on any of these kinds of supplements. In face a friend of mine who works in ICU said you should see a doctor before taking ANY supplements, even vitamins and especially if you are on medication already.