The timing of the first injection of Depo Provera
Gray, R.H.; Pardthaisong, T.; Mcdaniel, E.B.; Doyle, P.
Ippf Medical Bulletin 9(5): 3-4
1975
ISSN/ISBN: 0019-0357 PMID: 12258617 Document Number: 85969
The timing of the 1st injection of the contraceptive Depo Provera was studied by examining the risk of accidental pregnancy during 3 months following the 1st injection in 7930 women. The pregnancy rate was 1.62 pregnancies/1000 women if the injection was given within the 1st 8 days of the cycle and 6.22 pregnancies/100 women if given between cycle day 9 and 28. The difference is statistically significant (p less than .01). It is recommended that women who present later than cycle day 7 for an injection be given additional contraceptive protection for at least 1 month. There is no justification for rejecting a woman if she requests an injection at any time during her menstrual cycle.