Application method of Dendrobium candidum in preparing medicine for treating hypertension

A method of treating hypertension, comprising:

• administering Dendrobium officinale as a medicament with a daily dosage for adult orally equivalent to a raw drug dosage of 4 g to 16 g wherein the medicament is prepared by grinding Dendrobium officinale according to requirements of 2015 edition of Chinese Pharmacopoeia to a predetermined amount of powdered crude drug;
• alcohol extracting the powdered crude drug by adding 75% ethanol with an amount 5 times of the amount of the powdered crude drug, extracting twice at 60° C. for 24 hours, and recovering the ethanol to form a residue;
• water extracting the residue by adding 30 times of a total amount of the powdered crude drug of water with an extraction temperature controlled to be 100° C. for 2 hours to form a first time water extraction solution;
• water extracting the residue by adding 20 times of the total amount of the powdered crude drug of water with an extraction temperature controlled to be 121° C. for 2 hours to form a second time water extraction solution;
• concentrating and combining the first time water extraction solution and the second time water extraction solution to form a combined extract, and adding a predetermined amount of one or more excipients to the combined extract to obtain the medicament for treating hypertension.