The invention relates to a method for preparing drugs for treating hypertension employing
dendrobium officinale and
semen raphani as main materials. The method comprises the steps of
grinding fried
semen raphani,
radix ophiopogonis and a white peony root into
powder, mixing evenly, heating the mixture, extracting and concentrating to obtain a water extract concentrate;
grinding dendrobium officinale into
powder, adding the
powder to the water extract concentrate; and adding auxiliary materials for molding; or
grinding the four medicinal materials into powder and then carrying out
alcohol extraction: adding 5fold 75%
ethanol for extracting at 60 DEG C for 24h, carrying out extraction twice in all and recovering the
ethanol; after
alcohol extraction, carrying out water extracting treatment on residues, concentrating and merging the
alcohol extraction solution and the
water extraction solution; and adding the auxiliary materials for molding. The prepared drugs all are suitable for treatment of patients with hypertension, caused by a yin-
deficiency syndrome or a yin-deficiency and yang-predominance syndrome, accompanied by restlessness and
insomnia, or all are combined with antihypertensive drugs of the
Western medicine for treatment to reduce the dosage of the antihypertensive drugs of the
Western medicine. Meanwhile, the drugs are suitable for health use of patients with mild hypertension or normal hypertension.