Psyllium can clear away heat, relieve lymph, diuretic, cool the blood, expectorate, detoxification, and so on. Psyllium is sweet and cold in nature, belonging to liver, kidney, lung and small intestine meridian, it can be decocted and taken internally or pounded and applied externally on the affected area, which has the effect of clearing away heat, diuretic and gonorrhea (to improve the problem of dribbling in urine and the problem of small amount of urine not being able to be passed), as well as expelling phlegm, cooling the blood, and detoxifying the toxin. Clinically, plantain is often taken internally for the treatment of feverish drenching (burning stinging pain during urination, accompanied by urinary frequency and urgency, abdominal traction discomfort), burning, astringent pain in the urine, edema of the limbs, urine, as well as diarrhea, phlegm-heat, coughing, vomiting of blood, nosebleeds, and so on, but also can be pounded and applied externally to treat carbuncle sores and poisons (localized redness of the skin, swelling, heat, and pain are often accompanied by a low fever, weakness of the limbs, and depression, etc.), and so on. It should be noted that psyllium is contraindicated for people with kidney deficiency and spermatorrhea. It is recommended that patients who need it take it under the guidance of a doctor.