This is a question for your doctor or a pharmacist. You should only be taking the dose that was prescribed for you.
I'm confused as well. Are you taking this illegally? Did you get it from a friend? If it was prescribed to you the dose would be in the prescription, so I've got to guess you have not been prescribed this drug and might be thinking of taking it on your own. If that's true, don't. These drugs are very complicated. They have side effects. They can make you feel very weird. This drug is particularly problematic, as it was marketed illegally by the manufacturer for years and is still often used in a way that was never clinically trialed. So what's truly up?