Tonic drugs include two types: one is drugs that tonify qi, blood, yin and yang and enhance healthy qi; The second is health care products with drug therapy.

When taking tonics, we should master the principles of different people, different diseases, different places and different times. For example, pilose antler and red ginseng are all warm tonics, which should not be used by those with yin deficiency and excessive fire, otherwise it will cause dry mouth, sore throat and constipation; Angelica sinensis, Colla Corii Asini and Radix Rehmanniae Preparata are all nourishing drugs, which have nourishing effects on people with blood deficiency, but taking them for too long will affect appetite and cause diarrhea.

In addition, on an empty stomach, the pharmaceutical ingredients can directly contact with the gastric mucosa and be well absorbed to play a role, so as to avoid the influence of food dilution in the stomach, so it is best to take the tonic at 1 hour half an hour before meals.