There are several types of vaginal contraceptive rings

　　Vaginal contraceptive rings can be divided into 3 categories based on the type of medicine they contain, the amount released and the time the ring remains in the vagina:

　　　　(1) A vaginal contraceptive ring that releases a large amount of progesterone and is used intermittently.

　　　　(2) A vaginal contraceptive ring that releases large amounts of estrogen and progesterone and is used intermittently.

　　　　(3) A vaginal contraceptive ring that releases a small amount of progesterone and is used continuously.

　　The first two are placed into the vagina for 21-28 days in each menstrual cycle, and the latter can be placed continuously for 3-12 months without needing to be taken out during the menstrual period. The vaginal contraceptive ring currently used in Shanghai belongs to the latter type. It is brown-red in color, has a peripheral diameter of 40 mm and a ring body of 4 mm. The ring contains 250 mg of the contraceptive megestrol, which releases an average of 130 micrograms per day. Each ring can be used continuously for one year.

　　After the vaginal contraceptive ring is inserted into the vagina, the contraceptive pill in the ring is continuously and slowly released, and then absorbed by the vaginal mucosa to exert a contraceptive effect. Its main function is to change the properties of cervical mucus and reduce the stringiness of cervical mucus during ovulation, making the mucus thicker and unfavorable. sperm Through it, it can produce a contraceptive effect, and the contraceptive effectiveness rate is about 97%. >>>>> What are the symptoms of breast pain?