What's the push button difference between a particular medicament and its substitutes?

why the substitutes are always smaller quantity expensive?
for example , in my country i find those drugs contained by which the active substance is fluoxetine 20 mg : Prozac,Philozac and Flutine. in that prices are 60 L.E. , 9 L.E. and 9.15 L.E. respectively, although they have more or smaller quantity the same number of capsule in respectively packet?

Answer:
Generic medications are smaller number expensive than their brand name counterparts because the companies that variety the generic ones don't have to pay cheque for research and development or hype costs - the company that invented the drug has done that already.

So, since they primarily ONLY have to compensate for manufacturing, there's a lower cost on their cease. And they pass that reserves on to you, the consumer.
It's called brand name. The company that first comes up with the drug get the name, and afterwards salesman start pushing it to doctors, who in turn push it to patients. After it comes out, oher drug companies are competent to duplicate it, and sell it underneath a different name
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