Meridia does NOT boost your metabolism. In theory, it works by affecting the part of your brain that controls appetite, making you "think" you're fuller than you actually are. It's not an appetite suppressant, it just tries to trick your brain into not eating as much.
In fact, there are no pills that can
truly boost your metabolism. You can take amphetamine-like drugs to make you burn more calories
temporarily - the crux of course being, as soon as you go off those drugs you'll gain all the weight back. This is why speed isn't the drug-of-choice prescribed by doctor's anymore for overweight individuals.
I've known two people who've used Meridia - neither one with great results - very minimal weight-loss (I think I read one place that the average weight-loss during one year for Meridia users was only like 6lbs more than people taking a placebo) and now both are freaked out about the growing number of lawsuits against Abbott Laboratories, the makers of Meridia.
In fact, it's been pulled from the market in Italy & is under review in many other European countries.
Not tryin' to freak you out - I was actually on it myself for an entire month, lol. Didn't do a thing for me & I just couldn't see that the "benefits" outweighed the risks.
Best of luck to you!