Increased mammographic density of mammary gland tissues and hyperprolactinaemia are regarded as one of the risk factors for the development of breast cancer in women aged 40 to 52 years, which necessitates closer monitoring of the mammary gland and can be considered as modifiable. The herbal drug Cyclodynone® has a dopaminergic effect on the hypothalamus, which causes its inhibitory effect on the secretion of prolactin. At present, a significant positive clinical and scientific experience has been accumulated in the use of the Cyclodynone® for the treatment of benign breast dysplasias against a background of mild hyperprolactinaemia in women of reproductive age. Demonstration of the positive effect of this drug on the reduction of hyperprolactinemia, mammographic density of MF, evaluation on the scale BI-RADS would justify its application for the modification of this risk factor in women aged 40 to 52 years.

Hypothesis: Increased mammographic density of mammary gland tissues and hyperprolactinaemia are regarded as one of the risk factors for the development of breast cancer in women aged 40 to 52 years, which necessitates closer monitoring of the mammary gland. However, this risk factor can be considered as modifiable. The drug Cyclodynone® (contains 4 mg of special extract of dried fruits of Chaste Berry (Vitex agnus-castus)) has a dopaminergic effect on the hypothalamus, which causes its inhibitory effect on the secretion of prolactin. At present, a significant positive clinical and scientific experience has been accumulated in the use of the Cyclodynone® for the treatment of benign breast dysplasias against a background of mild hyperprolactinaemia in women of reproductive age. However, the experience of using Cyclodynone® in women older than 40-52 years with increased density or dyshormonal pathology of breast cancer is limited. Demonstration of the positive effect of this drug on the reduction of hyperprolactinemia, mammographic density of MF, evaluation on the scale BI-RADS would justify its application for the modification of this risk factor in women aged 40 to 52 years.

Inclusion Criteria:

• Female patients aged 40 to 52 years (inclusive) with mastodynia and BI-RADS category 3.
• The patient's written informed consent to participate in any study-related procedures.
• According to the Investigator, the patient's ability to comply with all the requirements of the study protocol, i.e. the patient's ability to cooperate adequately.
• Patients who do not have chronic diseases of the cardiovascular system, neuroendocrine system, kidneys, liver, gastrointestinal tract, respiratory system, skin in the decompensation stage.
• Consent to use reliable, evidence-based contraceptive methods (double containing the following types: hormonal, barrier, intrauterine spiral, etc.) throughout the study (from the time of the Informed Consent to Visit 6) .

Exclusion Criteria:

• Hypersensitivity to the components of the IMP.
• Burdened history of allergies.
• Participation in another clinical study less than 90 days before signing the informed consent form.
• History of cancer.
• Pregnancy or lactation.
• Administration of dopamine agonists, dopamine antagonists, oestrogens and antiestrogens, dopamine.
• Secondary amenorrhoea within 6 months or more.
• Surgical, pharmacological or physiological menopause (except hysterectomy).
• The prolactin level is more than 80 ng/mL.
• Other reasons which make the patient's participation in the study undesirable, according to the Investigator.

Research refers to the study of a pathological condition that occurs (applicable) only in the female population.