Q: I gave an IM injection of Depo-Provera 150mg/ml to a patient weighing 288 pounds following a first trimester abortion. I used a 1 inch needle and gave it in the gluteal muscle, her preferred site.
Do you feel this is adequate due to her weight and the fact that the needle was only 1 inch and not a 1 ½ inch needle?
I called Pfizer and the pharmacist stated there is no dose adjustment based on weight and that the pre-filled syringes use a 1 ½ inch needle.
Also, we have an underweight patient who would like her second Depo-Provera injection following a first trimester abortion. Her weight is 95 pounds and her height is 5’2”. Can you give advice about this issue?
A: You raise three questions. I will try to answer them all.
|1. Weight is not a factor in providing 150 mg injections of IM Depo-Provera.|
|2. I imagine your one injection with a one-inch needle will be effective. You could encourage her to use condoms for the duration of that injection – particularly in the last month. In the future use 1 ½ inch needles.|
|3. A very light woman may use 150 mg injections of Depo as her contraceptive.|
Robert A. Hatcher MD, MPH
Emeritus Professor of Gynecology and Obstetrics
Emory University School of Medicine
To learn more about the advantages and disadvantages of Depo-Provera injections, go to: www.managingcontraception.com and click on Choices 2013 edition. You can also order this wonderful new educational book from our website or by calling 404-875-5001. Do you have your copy yet? It is now available in English and Spanish.
Key Words: Depo-Provera injections, weight, trimester abortion, needle, adequate, Pfizer, pharmacist, dose adjustment, syringes, factor, effective, condoms
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