What are the effects and contraindications of prepared rehmannia root

Prepared rehmannia root has the function of nourishing blood and essence, regulating qi and blood, and can improve hair loss, dry cough, chronic diarrhea, shortness of breath, stomach discomfort and other symptoms caused by deficiency of qi and blood. Prepared rehmannia root should not be used for spleen deficiency and typhoid fever. Prepared rehmannia root should not be eaten with scallion white, radish, leek white and other foods at the same time.