Not much difference really. Chemicals like that are often given as salts, because this is often the easiest way to make them into powder/tablet form. Whether or not it's a bromide or a chloride or sulphide shouldn't really matter much, because that's not the part of the chemical that is pharmacologically active, the rest of it is (ie the citalopram). Just like IV injections of morphine are often found as morphine sulphate, chemicals that need to be stabilised or converted into another form for distribution can have a salt group or other group added onto it.
So the side effects and the price shouldn't be affected by it. That said, sometimes the process to make a specific iteration might be cheaper, but that doesn't mean the effects of it are any less or the more expensive version is any better.
Post edited at 7:15 am on Jan. 9, 2009 by marshmellowman
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and victorious in war shall be made glorious in peace.