Diaphragms

Diaphragms are single-sized flexible silicone domes that fit over the cervix to prevent sperm reaching the uterus. The single-size diaphragm available in Australia will fit approximately 80% of users. It is recommended that a healthcare professional checks the insertion technique to ensure the diaphragm is covering the cervix before it is first used. For a summary of the characteristics of diaphragms, see Comparison of barrier methods of contraception.

Diaphragms are contraindicated if there is a history of toxic shock syndrome.

Before inserting the diaphragm, 4 mL of a lactic acid gel is placed in the dome of the diaphragm on the side that will face the cervix. The diaphragm is then inserted into the vagina to cover the cervix.

Water-, silicone- and oil-based lubricants can be used with the diaphragm.

Unlike other barrier methods, the diaphragm must be left in place for at least 6 hours after sexual intercourse for sperm to be incapacitated by the lactic acid gel.

Although the diaphragm can be inserted many hours before intercourse, if there is an interval of more than 2 hours between insertion and intercourse, the diaphragm must be removed and more gel inserted before intercourse occurs. If a second act of intercourse occurs within 6 hours, the diaphragm should not be removed but a further 4 mL of lactic acid gel should be inserted into the vagina (taking care not to dislodge the diaphragm).

The diaphragm must be taken out and washed every 24 hours. It is not recommended for use as a contraceptive during menstruation.