Contraceptive pessary belongs to the external contraceptive pill, the main component of phenylmercury acetate has the effect of killing sperm, and the pessary surface of a layer of oil excipient, after entering the vagina can be transformed into oil, can prevent sperm from entering the cervix and impede the activity of sperm, the two components work together to play the role, so as to play the purpose of contraception. The suppository is very convenient to use and does not affect normal sex life, but the contraceptive effect is slightly worse than that of the pill and the IUD, and individual women may experience allergy and irritation when using the suppository. Since the pessary contains oil and grease, it will have a corrosive effect on rubber products, so do not use condoms while using the pessary. It takes 5-10 minutes after placing the pessary for it to fully melt before intercourse. If there is no ejaculation for 30 minutes, it is recommended to put in another pessary again, or else the contraceptive is prone to failure.