I have done that before and trust me, it will make you crazy. 1200 calories is too low in a day. Especially if you are working out also.
If you go to the gym for an hour or hour and a half for about five times a week. Make sure to do cardio for 20-30 minutes, then weight lifting (alternate between top and bottom half of body) for another 20-30 minutes and then do abs for another 20-30 minutes. This will let you burn at least 600-700 calories, but you can calculate here:
http://www.caloriecontrol.org/exercalc.h...
As for eating go to this website and calculate how much is the minimum amount of calories that your body can eat each day... just to keep it functioning
http://weightloss.about.com/od/eatsmart/...
So, what I do, is my body burns at least 1500 calories everyday (thats without excersise) just doing its normal functions. So I always make sure to eat at least that much. I think its better if you let yourself eat whatever you want for breakfast... then for lunch eat a healthy lunch, but once again eat as much as you want... just make sure its healthy. by the time dinner rolls around just eat fruits and veggies... So, I'm basically eating about 7-800 calories in the morning (the most time to burn them off throughout the day), then about 4-500 for lunch... then by dinner I'll have like a banana some strawberries and garlic mushrooms and I'm good for the day.
Also dont waste your calories on drinks. not even "diet" drinks. Stick to water or green tea.

the diet and exercise alone will do it, those pills are worthless and can make you feel terrible.

yes, you will loose weight mainly water weight, muscle mass and will mess up your metabolism! 1200 calories is WAY TOO LOW... trust me, I do fitness competitions and I'm really lean... Mainly you need to workout with intensity, get your cardio in first thing in the morning on an empty stomach, get at least three times a week of weight training to change and improve the shape of your body and most important: FEED YOUR BODY!
Fat loss pills are temporary solutions and will leave your body in pretty bad shape once you stop them... you will gain weight like crazy, be very lethargic and quite depressed (been there!)

yes but you will be emotionally messed up

WEll u need to do some exercise to lose weight
Hydroxy will have no effect without a good diet and exercise
Wadup007

Whenever you are trying to lose weight, you should concentrate on these three things which all work together in providing a healthier and quicker weight loss goal for yourself. I have found this combination really successful in my weight loss plans. The first thing is exercising and how much you can put forth into it. The more you exercise, the more results you will see. The next thing is dieting and the calorie intake. If you exercise more, technically you could eat more? Always watch what you eat.
Now the last step in a good weight loss plan is always a good diet pill that can help you get to the end of the road. I have found Proactol which is a natural herbal diet pill to be the best around. It's an appetite suppressant along with being a fat blocker which stops up to 28% of fat you eat. Read up about it at TheWeightLossPlace .com where I saved money on it. Proactol really works well with exercising which gives you plenty of energy to perform. Along with that your diet will be affected by Proactol due to the appetite suppressant and fat blocker. If you slip up on meals, the fat blocker kicks in. It's really great to stop food cravings.
Concentrate on those three things and the combination is deadly for the fat cells in your body. Good luck and I hope this helps.