Operational Obstetrics & Gynecology
DMPA or DEPO-PROVERA*
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Depot Medroxyprogesterone Acetate (DMPA) was approved in late 1992 by the FDA for use as a long-acting, injectable contraceptive. Prior to 1992, many clinicians had used DMPA for this purpose without explicit FDA approval.
150 mg of DMPA are injected IM every three months, giving failure rates of slightly less than 1%.
It is believed to exert its' contraceptive effect by some or all of the following:
- Inhibiting ovulation
- Changing cervical mucous
- Changing the lining of the uterus
- Altering fallopian tube function
- Other, as yet unclassified mechanisms
The first injection is given within 5 days of the onset of menses. It is considered effective 7 days after it is given.
DMPA should be given every 3 months, but there is a 2-4 week "grace period" at the end of the three months during which DMPA can be given and contraceptive efficacy remains unchanged.
If the injection is more than 2-4 weeks late, then backup contraception should be used for the first month.
It may be given post-partum.
- For women not breast-feeding, it should be administered within the first 5 days after delivery.
- For women who are exclusively breast-feeding, it should be administered during the 6th post-partum week.
The following are considered reasons to avoid giving DMPA. Some might be considered absolute contraindications, while others are more relative. In general, you should avoid both.
- Undiagnosed vaginal bleeding
- Known or suspected pregnancy
- Known or suspected breast cancer
- Active thrombophlebitis
- History of embolism or cerebrovascular disease
- Active liver disease or dysfunction
- Known hypersensitivity to DEPO-PROVERA
Measurable changes in bone mineral density occur, but this loss is not associated with an increased risk of pathologic fractures.
The greatest loss is early in the use of DMPA and slows with longer use.
The clinical significance of this finding is uncertain.
Menstrual changes are the rule and not the exception among women using DMPA.
Half of all women will develop amenorrhea by the end of one year's use. Spotting and intermenstrual bleeding intermenstrual bleeding are also common. Occasionally, this bleeding can be heavy.
These abnormalities are often simply tolerated and considered an acceptable side-effect of this form of contraception. Alternatively, you may discontinue the injections and allow the drug to wear off. Finally, you may treat the abnormal bleeding with small doses of estrogen or oral contraceptive pills,but the impact on contraception of such treatment is unknown and patients should use backup contraception methods while BCPs or estrogen is being given.
Ovulation resumes, on average 4.5 months after the last injection. Delay to conception after the last injection is approximately 10 months.
In an uncontrolled study, 60% of women using DMPA gained weight during the first 6 months of use. The magnitude of the weight gain was 5 pounds at the end of 1 year, and 15-16 pounds at the end of three years.
The problem with this study was the absence of a satisfactory control group. Many BCP studies have demonstrated the trend of women, as a group, to gain weight over time, whether they take BCPs or not.
DMPA use probably does lead to some degree of additional weight gain, but the magnitude of this gain is uncertain.
Headaches/Breast Tenderness/Psychological Changes
These side-effects have all been described, but are uncommon. They may be temporary, so simply watching to see if they disappear is warranted unless the symptoms are severe.
Among the psychological effects are diminished libido, fatigue, depression, and nervousness. There is no way of reversing the effects of DMPA other than letting it wear off, a process which takes 4.5 months, on the average.
If pregnancy occurs despite the use of DMPA, there is no good evidence that the DMPA will be harmful to the pregnancy. Because of theoretical concerns, DMPA should not be taken if pregnancy is known or suspected.
*DEPO-PROVERA is the registered trademark of Pharmacia & Upjohn Company, Bridgewater NJ
Contents - Introduction - Medical Support of Women in Field Environments - The Prisoner of War Experience - Routine Care - Pap Smears - Human Papilloma Virus - Contraception - Birth Control Pills - Vulvar Disease - Vaginal Discharge - Abnormal Bleeding - Menstrual Problems - Abdominal Pain - Urination Problems - Menopause - Breast Problems - Sexual Assault - Normal Pregnancy - Abnormal Pregnancy - Normal Labor and Delivery - Problems During Labor and Delivery - Care of the Newborn
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Bureau of Medicine
and Surgery |
Operational
Obstetrics & Gynecology - 2nd Edition |
This web version of Operational Obstetrics & Gynecology is provided by The Brookside Associates. It contains original contents from the official US Navy NAVMEDPUB 6300-2C, but has been reformatted for web access and includes advertising and links that were not present in the original version. This web version has not been approved by the Department of the Navy or the Department of Defense. The presence of any advertising on these pages does not constitute an endorsement of that product or service by either the Department of Defense or the Brookside Associates. The Brookside Associates is a private organization, not affiliated with the United States Department of Defense. All material in this version is unclassified.
This formatting C. 2006
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