How do you understand the “side effects” of drug therapy?

Everyone is afraid of side effects, which is understandable. But have you ever thought about why they are called “side” effects? That is the secondary effect, is the possible, note only the possible cost of the treatment. And what is the “primary effect”? That is the benefit of treatment. This is similar to making an investment, there is a reasonable return on the capital paid for it! Just make sure that the return on earnings is greater than the capital. You can’t keep trying to do a no-frills business. Although the cure has a hundred benefits and no harm is the ultimate goal we pursue, but in today’s medical technology, most of them are unrealistic. This reasoning is common to Chinese and Western medicine. A family of words, for reference only.