While vaginal lidocaine gel does not significantly reduce pain from intrauterine device (IUD) insertion, it does appear to reduce the pain from tenaculum placement in nulliparous women and the likelihood that women will need cervical dilation for insertion, according to the results of a randomized controlled trial.
Despite the effectiveness of IUDs in preventing pregnancy, some women don’t choose this contraception method because they fear the pain of insertion, past research has found. Pain is also more likely in women who have not given birth. In fact, just 5.9% of nulliparous women use IUDs, compared with 16.8% of women with one or two prior births, wrote Rachel B. Rapkin, MD, MPH, of the University of South Florida in Tampa, and her colleagues (Obstet Gynecol. 2016;128:621-8. doi: 10.1097/AOG.0000000000001596).
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The researchers tested the effectiveness of self-administered lidocaine gel as pain relief with 59 nulliparous women aged 14-50 years from University of Pittsburgh Medical Center clinics between July 2012 and May 2013. All of the women requested an IUD. A total of 30 women were randomized to apply the 2% lidocaine vaginal gel 5 minutes before the IUD insertion. Another 29 women were randomized to apply a placebo gel. Nearly all the women reported that inserting the gel was somewhat or very easy and that they had no pain after insertion.
There was one unsuccessful IUD insertion in the placebo group. That woman had intolerable pain while attempting uterine sound so the procedure was aborted. She was included in the intention-to-treat analysis with all missing data set to 100 mm on a 100-mm visual analog scale.
In the intention-to-treat analysis, the median change in pain from baseline to IUD insertion was 61 mm for women who used the lidocaine gel. Women using placebo reported a median score of 69 mm, which was not significantly different from those using the lidocaine gel (P = .06). However, women using lidocaine did report significantly less pain when the tenaculum was placed: a median 32 mm on the pain scale, compared with 56 mm reported by those who used the placebo gel (P = .02).
Although 87% of the physicians reported that insertion was easy in the women with lidocaine, compared with 64% who said it was easy in women using the placebo gel, the difference was not significant (P = .07). However, significantly more women needed cervical dilation before IUD placement if they used the placebo (34.5%), compared with those using the lidocaine (3.3%, P = .002). The women also reported pain scores after speculum placement, uterine sounding, and 5 minutes after speculum removal, but none of these showed significant differences.
Overall, more than one-third of the women needed to take pain medication for at least 3 days after the IUD was inserted, but the majority of women (86%) would probably or definitely recommend an IUD to a friend, and 76% reported satisfaction with the insertion experience. Cramping and pain medication use after insertion did not vary between the two groups.
The generalizability of the trial may be limited because it enrolled participants who were largely white and college educated and it used clinicians with at least 4 years of IUD insertion experience.
The research was funded by the Society of Family Planning Research Fund. Dr. Rapkin reported having no financial disclosures. Her coauthors reported consulting work for Merck and research funding from Bayer Healthcare and Medicines 360 Inc. One of the coauthors is founder and president of the nonprofit Basic Health International.