There is no clear indication in the clinic which three kinds of people should not take Plantago Ovata, but the drug is forbidden for patients with ejaculation caused by deficiency and slippery essence. Psyllium is sweet and cold in nature and belongs to the liver, kidney, lung and small intestine meridians. It has the efficacy of clearing away heat, diuretic and drenching (to improve the problem of dribbling in urine and the problem of insufficient volume of urine), expectorating phlegm, cooling the blood, and detoxifying the toxin. It can be clinically used in the treatment of heat drenching (obvious burning and stinging pain when urinating, accompanied by frequent urination and urgency, and discomfort of traction in the abdomen) and astringent pain, phlegm-heat cough, vomiting and epistaxis, carbuncle, swelling, sores and poison, and so on. When using this medicine, attention should be paid to the deficiency and slippage of essence and Qi, which is not solidified in the discharge of semen is prohibited. Before using Plantago Ovata, it is recommended to visit a regular hospital and use it under the guidance of a professional physician.