中药材是整个中药生产的源头。中药材既可经过复杂生产工艺，被直接制成中成药，也可被加工成中药饮片，中药饮片是临床汤剂和中成药生产的原料，还可被加工成中药材提取物，再进一步制成配方颗粒或中成药。中药材饮片、配方颗粒、中成药均可由中药材销售公司、连锁药店及医院等进行销售，各个环节，相互影响，又相互关联。

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