do combined drugs produce more side efects?

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hello myLotters. i've been writing an article about a particular prescription drug, which is a combination of two drugs belonging in different classes of drugs. i've been searching the web for information regarding their possible side effects, but they almost share the same ones. i'm just wondering if the actual drug combined into one produces more side effects than each drug separately taken, or if its side effects are more likely to occur, since it works in two different ways, although each drug treats the same condition? i also want to know if there will be other side effects that could occur that are not produced by either drug when taken separately.. is this possible? i know that when combined, they do treat the condition better..as based on what some medicine-related sites say.. i really have no idea..