Contraceptive Methods and Issues Around The Menopause: An Evidence Update
Contraceptive Methods and Issues Around The Menopause: An Evidence Update
12416
    The Obstetrician & Gynaecologist
                                                                                                                                        Review
    http://onlinetog.org
Please cite this paper as: Bakour SH, Hatti A, Whalen S. Contraceptive methods and issues around the menopause: an evidence update. The Obstetrician &
Gynaecologist 2017; DOI: 10.1111/tog.12416.
relationship breakdown and re-partnering is increasing, and          progestogen in most hormonal contraception methods
sexual intercourse occurs more frequently in new                     provides endometrial protection. The exception is the
relationships.4 Sexually transmitted infection (STI) rates are       Mirena (Bayer plc, Newbury, UK) levonorgestrel-releasing
increasing most rapidly in women over the age of 40 years.5          intrauterine system (IUS) (52 mg IUS), which is licensed for
Only condoms protect against STI transmission, including HIV.        this indication for 4 years but evidence supports its use for
                                                                     5 years.8
                                                                        Women using combined methods of contraception can use
Stopping contraception
                                                                     regimens with shorter pill-free intervals to reduce the risk of
During the perimenopause, follicle stimulating hormone               menopausal symptoms.12
(FSH) levels can fluctuate considerably.6 Neither a single FSH
measurement nor the presence or absence of menopausal
                                                                     Choice of methods of contraception
symptoms can reliably predict loss of fertility. For women
over the age of 50 years who do not use hormonal methods,            Women must be advised on all available methods of
contraception can be stopped after 1 year of amenorrhoea as          contraception, including long-acting reversible methods
fertility is unlikely to return. In women under 50 years of age,     (LARC), so they can make an informed choice.13 No
contraception should be continued for 2 years, as the return         method of contraception is contraindicated based on age
of fertile ovulation is more likely to occur.7                       alone, up to the age of 50 years.8 Table 1 summarises the
   Hormonal contraception can affect bleeding patterns               main advantages, risks and reliability of contraceptive
making it difficult for clinicians to advise when                    methods for perimenopausal women.14,15 Table 2 shows the
contraception can safely be stopped. For women over the age          contraceptive methods chosen by UK women in
of 50 years using oral progestogen-only methods, subdermal           this age group.16
implants and intrauterine systems, the Faculty of Sexual and            It is essential to acquire a personal, sexual and family
Reproductive Healthcare (FSRH) recommends that                       history, and pregnancy should be excluded (see Box 1).17
contraception should be continued for 1 year after recording         Body mass index and blood pressure should be checked and
two FSH levels at >30 IU/l, taken at least 6 weeks apart.8           STI screening offered, particularly before an IUC device is
   Combined hormonal contraception (CHC) affects FSH                 inserted. Pelvic examination is only required prior to fitting
levels so should be stopped for at least 2 weeks prior to testing,   an IUC. Cervical cytology should be offered in line with the
although evidence is limited.9 Return of ovulation is delayed        National Cervical Screening Programme.
when injectable methods such as medroxyprogesterone acetate
(Depo Provera [Pfizer Ltd., Sandwich, UK]) are stopped, so          Combined hormonal contraception
these should be stopped at least 1 year before                       The use of CHC beyond the age of 50 years is not
taking FSH levels.10                                                 recommended, although a lack of safety evidence in this age
   Alternatively, women can consider stopping their method           group means it cannot be completely ruled out.18 Combined
of contraception at the age of 55 years when most will have          methods can be given orally, transdermally (Evra [Janssen-
reached natural infertility.8 Very few women continue to have        Cilag International NV, Beerse, Belgium]) and vaginally
fertile ovulation beyond this age. Despite this guidance, it is      (NuvaRing [Merck & Co., Inc. NJ, USA]), but less data are
impossible to completely guarantee infertility after stopping        available on the patch and the vaginal ring. Combined
contraception, so careful counselling is essential to balance        monthly injections (Cyclofem and Mesigyna) are available
the consequences of unplanned pregnancy with the potential           in many countries, but not in the USA or Europe.
health risks of continuing contraception.                               Most combined pills contain the synthetic estrogen ethinyl
                                                                     estradiol. Newer methods (Zoely [Merck Sharp & Dohme
                                                                     Limited, Hoddesdon, UK] and Qlaira [Bayer plc, Newbury,
Hormone replacement therapy and
                                                                     UK]) contain estradiol but there is no established difference
contraception
                                                                     in their safety profiles. Estradiol formulations have shorter
Although very little data are available to inform practice in        hormone-free intervals, so may reduce the occurrence of hot
this area, sequential hormone replacement therapy (HRT),             flushes during the pill-free week in standard regimens.
the type recommended in the perimenopause, is not                    Combined pills cause shorter withdrawal bleeds and more
contraceptive as it inhibits ovulation in only 40% of                amenorrhoea than standard pills, but more unscheduled
women.11 Contraception must be used alongside HRT to                 bleeding; this may be unacceptable to perimenopausal
avoid unplanned conception. Progestogen-only methods and             women. With all ethinyl estradiol pills, if less frequent
intrauterine contraception (IUC) are suitable.                       bleeds are desirable or hot flushes occur during the pill-free
   Combined progestogen and estrogen HRT must be used in             week, tailored regimens with prolonged pill-taking or shorter
women with an intact uterus as there is no evidence that the         pill-free intervals are effective, reliable and safe.18
Table 1. Advantages, disadvantages and failure rates for all available contraceptive methods in perimenopausal women14,15
                                                                                                                               Risk of failure
                                                                                                                               in first year of
                                                                                                                               typical nonperfect
 Method                         Advantages                                 Disadvantages                                       use57 (%)
 Combined hormonal              Regular bleeding pattern                   Increased risk of thrombosis, and breast and                9.0
 contraception                  Reduction in menstrual bleeding and        cervical cancer
                                flushes                                     Daily dosing required
 Progesterone-only pills        Very few medical contraindications         Irregular bleeding                                          9.0
                                                                           Daily dosing required
 Progesterone-only              Long-acting method                         Masks menopause                                             6.0
 injectable                     Often induces amenorrhoea                  Bone mineral density concerns
                                                                           Unable to remove after injection
 Progesterone-only              Very few contraindications                 Irregular bleeding                                          0.05
 implant                        Easily reversible                          Requires trained operative
 Copper intrauterine            Hormone-free                               Heavy menstrual bleeding and pelvic cramps                  0.8
 device                         Does not mask menopause                    Unsuitable if woman has a distorted uterine
                                Long-acting method                         cavity
 Levonorgestrel-releasing       Long-acting method                         Irregular bleeding                                          0.2
 device                         Treatment for heavy menstrual bleeding     Unsuitable if woman has a distorted uterine
                                Endometrial protection with hormone        cavity
                                replacement therapy
increased.23 They are safe for use in women suffering from           at 12-week intervals), Noristerat (Bayer plc, Newbury, UK)
migraine with aura.24 The limited evidence available does not        (norethisterone enantate 200 mg, given intramuscularly at 8-
support a causal link between POP use and breast cancer.             week intervals) and the recently licensed Sayana Press
However, there is a small increased risk of breast cancer in         (Pfizer Limited, Sandwich, UK) (medroxyprogesterone
women who take POPs, but this risk is reduced when the user          acetate 104 mg, given subcutaneously at 13-week intervals).
stops taking these pills.25 Another advantage of POPs is they        All are reliable long-acting methods of contraception, with
can be used in smokers over the age of 35 years.24                   very low user failure rates. Although Depo Provera is
   Traditional POPs contain norethisterone or levonorgestrel,        licensed for 12 weeks, there is evidence that pregnancy rates
and newer POPs contain desogestrel. Both can be used until           remain low for up to 14 weeks after administration.31
the age at which natural loss of fertility is assumed.26 POPs           Depo Provera is the most commonly used injectable
help to reduce HMB and dysmenorrhea27 and there is no                method of contraception. Sayana Press has equivalent
delay in return of fertility when POPs are stopped.                  efficacy and an almost identical side effect profile, and is
   Disadvantages of POPs include an irregular bleeding pattern       licensed for self-administration in the UK.32 More than 50%
and narrow window of safety for missed pills. A missed pill is       of women become amenorrhoeic after 1 year of use and
one that is taken more than 3 hours late, or with desogestrel        nearly 70% after 2 years of use.33 This is very desirable for
pills, more than 12 hours late. Although some older studies          some women and can be a way to manage irregular bleeding
suggest that they may be of use, POPs do not improve                 in the perimenopause.
menopausal hot flushes8 like the combined contraceptive pill.           The main concern with injectable methods is bone health:
                                                                     approximately 5% of bone is lost within the first 2 years of
Implants                                                             use.34 Longer-term use causes no further loss of bone, but
The only contraceptive implant available in the UK and the           research suggests that bones take longer to recover when this
USA is the etonorgestrel-containing Nexplanon (Merck                method is stopped.35 It is unknown whether or not bones
Sharp & Dohme Limited, Hoddesdon, UK), a 4 cm x 2 mm                 make a full recovery. In a small study, there was no difference
rod that is implanted in the inner aspect of the upper arm,          in bone mineral density after 3 years between women who
usually on the non-dominant side. It has similar indications         became postmenopausal while using Depo Provera and
and a similar side effect profile to the desogestrel-containing      those who never used this method.36 Another trial found that
POPs. This implant should be fitted and removed by an                Depo Provera users have a higher fracture risk than non-
operator trained to Faculty of Sexual and Reproductive               users prior to starting, but Depo Provera does not increase
Healthcare (FSRH) safety standards.28                                the subsequent risk of fractures.37 Bone loss after 2 years of
   Nexplanon is the most effective reversible method of             Depo Provera use is equivalent to bone lost during
contraception and can be used for up to 3 years with                 pregnancy and breastfeeding for 6 months. The FSRH
immediate return of fertility on removal. There is no user           recommends that women consider stopping injectable
failure rate, but additional contraceptive protection is advised     contraceptives at the age of 50 years, but add that
if not fitted within the first 5 days of menstruation. It can be     continuing beyond this age is unlikely to result in
used safely by nearly all women throughout their                     unacceptable adverse outcomes.
reproductive years to menopause, even in women with                     Another disadvantage of Depo Provera is that the
comorbidities. Unlike injectable contraceptive methods, this         injection cannot be removed if side effects or health
implant has no effect on bone mineral density. There is no           concerns arise. The FSRH’s position is that the risks of the
evidence to suggest an increased failure rate in women               method outweigh the benefits in women with multiple risk
weighing up to 149 kg,28 and no limit to the number of times         factors for cardiovascular disease.8
the implant can be replaced at 3-yearly intervals.
   About 20% of women with this implant have amenorrhoea; a          Intrauterine device
desirable side effect for some women, for example, those with        The intrauterine device (IUD) is an effective and safe form of
irregular perimenopausal bleeding after exclusion of pathology.      long-term contraception in women over 40 years of age.
However, 1 in 5 women have the device removed within the             IUDs should contain at least 300 mm of copper8 wound onto
first year because of persistent or irregular bleeding.29 This can   a plastic frame, with bands of copper on the horizontal arms
mask other causes of irregular bleeding such as endometrial          as well as the stem (Figure 1). The TT380 slimline (Durbin
cancer, although this diagnosis remains rare in perimenopausal       PLC, South Harrow, UK) and Cu T 380 A (Pregna
women using hormonal contraception.30                                International Ltd, Mumbai, India) are examples of gold-
                                                                     standard 10-year IUDs. Also available is Gynefix (Contrel
Injectable contraception                                             Europe NV, Gent, Belgium), a frameless device with copper
Three injectable contraceptives are available: Depo Provera         bands mounted onto a monofilament thread (Figure 2). The
(medroxprogesterone acetate 150 mg, given intramuscularly            expected reduction in IUD-associated dysmenorrhoea with a
                                                                 Intrauterine system
                                                                 An IUS is a reliable, cost-effective contraceptive option for
                                                                 women, which releases very low systemic levels of
                                                                 levonorgestrel locally into the endometrium. Approximately
                                                                 4% of UK perimenopausal women40 use an
                                                                 IUS for contraception.
                                                                    Two IUS devices are currently available; Mirena or
                                                                 Levosert (Gedeon Richter Plc., Budapest, Hungary), both of
                                                                 which contain 52 mg of levonorgestrel (52 mg IUS), and
                                                                 Jaydess (Bayer plc, Newbury, UK) which contains 13.5 mg
                                                                 of levonorgestrel (13.5 mg IUS). Mirena is licensed for
                                                                 contraceptive use for 5 years; Levosert and Jaydess for
                                                                 3 years. However, the FSRH evidence-based guidance
                                                                 supports the use of Mirena in women older than 45 years
                                                                 of age for up to 7 years, or to menopause if the woman
                                                                 remains amenorrhoeic.39
                                                                    Mirena is licensed for the treatment of HMB, and to give
                                                                 endometrial protection when used with estrogen-only
                                                                 HRT.41 Neither Jaydess or Levosert are licensed for these
                                                                 indications. The newer and lower dose-containing Jaydess
                                                                 has an insertion diameter smaller than the 52 mg IUS, so can
                                                                 be used in smaller uteri, nulliparous women and older
                                                                 women in the later years of reproduction.42
Figure 2. Example of a frameless intrauterine device.               For women of perimenopausal age, the most important
                                                                 health benefit of the 52 mg IUS is its effect on menstrual
                                                                 bleeding. Within 3 months of insertion this IUS reduced
frameless device has not been shown in practice, but it might    blood loss by over 80% in women with HMB. A Cochrane
be useful for women with distorted cavities; for example         review42 showed that using an IUS is more effective than
women with small fibroids where a framed device may be           norethisterone for the management of HMB. IUS devices are
harder to fit.                                                   equal to ablation and hysterectomy for improving women’s
   IUDs can be used both as emergency and continuing             quality of life. IUSs are also effective for reducing fibroid-
contraception for a period of 5–10 years. They prevent           associated bleeding, and improve endometriosis-associated
fertilisation when inserted precoitally, and when inserted       pain. Guidelines published by the National Institute for
postcoitally, they prevent implantation after fertilisation.38   Health and Care Excellence (NICE) should be followed if the
When inserted in women older than 40 years they can be           IUS is fitted to manage HMB. A 52-mg IUS can also been used
used until menopause,8 although this use is outside of the       for endometrial protection during tamoxifen treatment.43
manufacturer’s license. IUDs must be removed after                  There is no evidence to support a link between breast
menopause or when no longer required.                            cancer and IUS use. IUSs have minimal systemic side effects,
no risk of venous thromboembolism or other systemic               happened without using the method.41 With lower fertility
diseases, and no evidence of weight gain, hence they are a safe   rates in the perimenopause, withdrawal can be used as an
option for perimenopausal women, especially those                 adjunct to other methods, like NFP.
with HMB.
   IUSs should be removed after menopause. Actinomyces-           Sterilisation
like organisms (ALOs) can be found in IUD and IUS users. In       Female sterilisation is a permanent and highly successful
the absence of pain, pyrexia or unscheduled bleeding the          form of contraception used by about 18% of UK women over
device can be left in situ as the risk of actinomyces-related     the age of 40 years.40 All women considering sterilisation
PID is very low.44                                                must be counselled regarding LARC methods, as these are as
                                                                  reliable as sterilisation. A woman who is approaching
Barrier contraception                                             menopause and will shortly reach natural sterility should
Both men and women have barrier methods of contraception          consider LARC rather than pursue a surgical method of
available to them. Condoms account for 10% of                     time-limited value.
contraceptive use in the perimenopausal age group40. Use             Sterilisation involves occluding the fallopian tubes and can
of diaphragms and caps with spermicides are used by <1% of        be done laparoscopically, via mini-laparotomy, during
UK women. Barrier contraception is safe to use until              caesarean section, or hysteroscopically. Hysteroscopic
menopause is confirmed.                                           techniques can be done under local anaesthetic; however,
   Condoms are 98% effective and women’s barrier methods          another form of contraception must be used until tubal
are up to 95% effective; however, effectiveness of both           occlusion is confirmed after 3 months.
methods is user-dependent.45 Erectile dysfunction can                Vasectomy has a lower failure rate after proven
prevent condom use for some men. Diaphragms and caps              azoospermia (1 in 2000)47 and lower complication rates,
must be used with spermicide, correctly inserted, and remain      although chronic postvasectomy pain occurs in up to 14% of
in place for 6 hours after intercourse.45 Condoms have the        men.47 Female sterilisation has a failure rate of 1:200.47 Other
advantage of protecting against STIs, rates of which are          than preventing pregnancy, sterilisation confers none of the
known to be increasing in perimenopausal women.                   other benefits of hormonal contraceptives, and is associated
   Oil-based lubricants and estrogen-containing vaginal           with surgical risks.
creams and pessaries should not be used with condoms or
latex diaphragms.45 They can weaken latex and most non-           Emergency contraception
latex condoms, thereby increasing the risk of failure caused      There are three methods of emergency contraception (EC)
by breakage. They do not affect silicone diaphragms and           available in the UK: levonorgestrel (LNG; Levonelle [Bayer
female condoms. Non-oil-based lubricants should be used           plc, Newbury, UK]), an oral progestogen; ulipristalacetate
and these can also improve sexual difficulties secondary to       (UPA; ellaOne [Laboratoire HRA Pharma, Paris, France]),
vaginal dryness. Non-latex diaphragms and condoms should          an oral selective progestogen receptor modulator; and the
be offered to those with latex allergy.                           copper IUD. All are safe for use during the perimenopause.
                                                                  LNG and UPA inhibit or delay ovulation for up to 7 days,
Natural family planning methods                                   which is beyond the natural span of sperm within the genital
Fertility awareness methods, also called ‘natural methods’, are   tract, and can both be used more than once in the
used by 4% of older women in the UK.40 These methods              same menstrual cycle.15
include monitoring body temperature, cervical mucus and the          Levonorgestrel can be used up to 72 hours after
length of the menstrual cycle, and plotting the values on a       unprotected sexual intercourse (UPSI) but becomes less
chart to predict the fertile time. Devices such as Persona       effective as time passes.49 UPA remains effective for up to
(Swiss Precision Diagnostics, Bedford, UK) are also available     120 hours after UPSI.49 Although levonorgestrel works only
to buy, which monitor urine hormone levels.46 Natural family      up until the start of the pre-ovulatory LH surge,50 UPA works
planning (NFP) methods become less reliable in the                up to just before the LH peak.51
perimenopause because ovulation becomes more difficult to            Copper IUDs are the most effective form of EC and should
predict as cycles become less regular and ovulation markers are   always be offered when EC is requested. IUDs effectively
difficult to interpret. Both the woman and her partner must be    prevent implantation after fertilisation as soon as they are
motivated to use this method consistently and correctly.          fitted. This mechanism of action should be explained because
                                                                  methods that act after fertilisation are not acceptable to some
Withdrawal method                                                 women. IUS devices are not licenced for use as EC and
Withdrawal is natural form of contraception used by               should therefore not be used.
approximately by 5% of UK perimenopausal couples.40 It               Following EC with levonorgestrel, reliable continuing
prevents approximately 50% of pregnancies that would have         contraception should be started as soon as possible –
Intrauterine contraception
Like the frameless IUD, Gynefix, a frameless levonorgestrel-       made the development of an acceptable method difficult. The
releasing IUS, has also been developed but is not yet licensed.53   ethics of contraception for men should be considered as it
However, the intrauterine ball (IUB) (Figure 3) has recently        prevents pregnancy in women but might be associated with
been licensed in Austria and will likely be marketed elsewhere      risks or side effects for the man. Contraceptives for men
in Europe and North America. It is a frameless IUD consisting       might be suitable for some couples in the perimenopause,
of a shaped memory alloy (Nitinol) thread that holds 20 tiny       especially if there are medical problems precluding the use of
copper spheres. The device becomes spherical once delivered         other methods, but it is unlikely that these will be marketed
into the uterus and might have greater potential for use in         in the near future.
non-uniform endometrial cavities.54 As a hormone-free
method, there will be no contraindications to its use in            Progesterone receptor modulators
perimenopausal women.                                               Work continues to develop a vaginal ring releasing UPA, a
                                                                    selective progesterone receptor modulator (PRM) currently
Microchip drug-release technology                                   licensed as an EC, which will provide effective estrogen-free
Microchip drug-release technology, currently in development,        contraception.56 Benign endometrial thickening and
will allow a progestogen-releasing microchip (Figure 4) to be       glandular cystic dilation can occur with this method, as
implanted for up to 16 years of use, which can be switched on       well as unscheduled heavy bleeding.56 Research is currently
and off with a remote control.55 This would allow planned           exploring the safety of this method of contraception,
pregnancy followed by immediate reactivation. Although this         especially     given     that    endometrial   changes     in
may be the future of LARC, there is potential for malicious         perimenopausal women could be misdiagnosed if bleeding
control of the device.                                              irregularities require investigation.
                                                                       Research into the contraceptive effects of mifepristone, a
Male contraception                                                  selective PRM that effectively causes endometrial atrophy, is
Contraception for men has been widely studied but so far the        unlikely to continue because of its use in early medical
only available licensed methods are condoms and                     abortion, and resulting licensing restrictions and
sterilisation. The drop in testosterone levels associated with      methodical concerns.
azoospermia, and the time taken to achieve azoospermia, has
                                                                    Vaccines
                                                                    Vaccines against gametes have been a promising avenue of
                                                                    research in the past, but unpredictable response to
                                                                    vaccination and then early loss of immunity have meant
                                                                    their promise has not been fulfilled.57
                                                                    Conclusion
                                                                    In the absence of accurate evidence-based advice on fertility,
                                                                    contraception and HRT, perimenopausal women remain at
                                                                    risk of an unplanned pregnancy. There is no method of
                                                                    contraception that is contraindicated for women under the age
Figure 3. Example of an intrauterine ball.                          of 50 years on the basis of age alone. HRT does not provide
adequate contraception. After taking a comprehensive medical                       6 Burger HG. Diagnostic role of follicle-stimulating hormone (FSH)
                                                                                     measurements during the menopausal transition – an analysis of FSH,
history, all women should be given information on all suitable                       oestradiol and inhibin. Eur J Endocrinol 1994;130:38–42.
methods of contraception so that they can make an informed                         7 World Health Organization. Progress in Reproductive Health. Contraception
choice. When giving contraceptive advice to perimenopausal                           and the Late Perimenopause. 40(2). 1996.
                                                                                   8 Faculty of Sexual and Reproductive Healthcare Clinical Effectiveness Unit.
women with multiple comorbidities, clinicians should                                 FSRH clinical guidance: contraception for women over 40. London: FSRH;
carefully consider the associated risks. New research and                            2010 [http://www.fsrh.org/pdfs/ContraceptionOver40July10.pdf].
product developments will widen the contraceptive choice for                       9 Castracane VD, Gimpel T, Goldzieher JW. When is it safe to switch from oral
                                                                                     contraceptives to hormonal replacement therapy? Contraception
women in this age group.                                                             1995;52:371–6.
                                                                                  10 Jain J, Dutton C, Nicosia A, Wajszczuk C, Bode FR, Mishell DR Jr.
                                                                                     Pharmacokinetics, ovulation suppression and return to ovulation following
Disclosure of interests                                                              a lower dose subcutaneous formulation of Depo-Provera. Contraception
                                                                                     2004;70:11–8.
SB is a TOG Editorial Board member, a member of the                               11 Gebbie AE, Glasier A, Sweeting V. Incidence of ovulation in perimenopausal
MRCOG Membership Exam Part III Committee, an                                         women before and during hormone replacement therapy. Contraception
                                                                                     1995;52:221–2.
MRCOG Membership Exam Part II Standard Setter, a                                  12 Casper RF, Dodin S, Reid RL. The effect of 20 lg ethinyl estradiol/1 mg
reviewer for StratOG and BJOG and a former member of                                 norethinderone acetate (MinestrinTM), a low-dose oral contraceptive, on
the Royal College of Obstetricians and Gynaecologists’                               vaginal bleeding patterns, hot flashes and quality of life in symptomatic
                                                                                     perimenopausal women. Menopause 1997;4:139–47.
Education Quality Assurance Committee.                                            13 National Collaborating Centre for Women’s and Children’s Health, National
SW is a member of the British Menopause Society, Chair of                            Institute for Health and Care Excellence. Long-acting reversible
the West Midlands Association for Contraception and Sexual                           contraception: the effective and appropriate use of long-acting reversible
                                                                                     contraception (CG30). London: RCOG Press; 2013 [http://www.nice.org.uk/
Health, and a Faculty of Sexual and Reproductive Health-                             guidance/cg30/evidence/full-guideline-194840605].
registered trainer for the diploma and letters of competence                      14 Association of Reproductive Health Professionals. Choosing a birth control
in contraceptive techniques.                                                         method. Contraceptive failure rates: table. Washington, DC: ARHP; 2014
                                                                                     [https://www.arhp.org/Publications-and-Resources/Quick-Reference-Guide-
                                                                                     for-Clinicians/choosing/failure-rates-table].
Contribution to authorship                                                        15 Faculty of Sexual and Reproductive Healthcare of the Royal College of
This paper was the sole work of SB, AH and SW. All authors                           Obstetricians and Gynaecologists. UK medical eligibility criteria for
                                                                                     contraceptive use. London: FSRH; 2016 [https://www.fsrh.org/standards-
approved the final version.                                                          and-guidance/external/ukmec-2016-digital-version/].
                                                                                  16 Lader D. Opinions survey report No. 41: contraception and sexual health
Acknowledgements                                                                     2008/09. Richmond: Office for National Statistics; 2009.
                                                                                  17 Faculty of Family Planning and Reproductive Healthcare of the Royal College
Thanks to Claire Bailey, Specialist Trainee, for her comments                        of Obstetricians and Gynaecologists. UK Selected practice
on the manuscript.                                                                   Recommendations for Contraceptive Use. London: Faculty of Sexual Family
                                                                                     Planning and Reproductive Healthcare; 2002.
                                                                                  18 Faculty of Sexual and Reproductive Healthcare of the Royal College of
Supporting Information                                                               Obstetricians and Gynaecologists. FSRH clinical guidance: combined
                                                                                     hormonal contraception – August 2012. London: FSRH; 2012 [http://
  Additional supporting information may be found in the                              www.fsrh.org/pdfs/CEUGuidanceCombinedHormonalContraception.pdf].
                                                                                  19 Beaber E, Buist DS, Barlow WE, Malone KE, Reed SD, Li CL. Recent oral
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                                                                                  20 Hannaford PC, Selvaraj S, Elliot AM, Angus V, Iversen L, Lee AJ. Cancer
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