A few drugs have harmful effects when used together and should not be combined (an example is stavudine and zidovudine).

某药物一起使用时的会产生有害影响，不应组合使用(例如司他夫定和齐多夫定)。

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However, they are rarely used as a first line of treatment because when MAOIs are combined with certain foods or other medicines, dangerous side effects can occur.

然而它们很少用作首次治疗，因为这种药物一旦与某些食物或药物混合将会引发危险的副作用。

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When compounds are combined and their effects are more than the sum of their individual effects; the compounds are said to have positive synergy.

当化合物混合在一起后产生的作用比它们各自单独作用累加还要强时，这些化合物即被称为具有积极的增效作用。

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Unfortunately, unforseen side effects emerged sometimes when Redux was combined with another diet drug, phentermine: Patients developed potentially lethal problems with their heart valves.

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Unfortunately, unforeseen side effects apparently emerged when Redux and Pondimin were combined with another diet drug, phentermine.

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