Contraception Flashcards
perfect and typical use failure rate for NFP
Perfect: 0.4-5%
Typical: 24%
perfect and typical use failure rate for male condoms
Perfect: 2%
Typical: 18%
perfect and typical use failure rate for female condoms
Perfect: 5%
Typical: 21%
perfect and typical use failure rate for CHC
Perfect: 0.3%
Typical: 9%
perfect and typical use failure rate for POP
Perfect: 0.3%
Typical: 9%
perfect and typical use failure rate for injectable contraception
Perfect: 0.2%
Typical: 6%
perfect and typical use failure rate for IUS
Perfect: 0.2%
Typical: 0.2%
perfect and typical use failure rate for IUD
Perfect:0.6%
Typical: 0.8%
perfect and typical use failure rate for implant
Perfect: 0.05%
Typical: 0.05%
perfect and typical use failure rate for male sterilisation
Perfect: 0.1%
Typical: 0.15%
perfect and typical use failure rate for female sterilisation
Perfect: 0.5%
Typical: 0.5%
Types of progestin only oral contraception
Noresthisterone 350mcg
Levonogestrel 30mcg
Desogestrel 75mcg
Mechanism of action of desogestrel, levonorgestrel and noresthisterone progestin only oral contraception
All cx mucus effect (thickens)
Desogestrel suppresses ovulation in 97% users
LNG/NET variably suppress ovulation (~50%) but not reliably
Bleeding pattern on NET/LNG POP
50–70% of cycles in women using the POP
will be of ‘normal’ length, i.e. between 25 and 35 days
25% of cycles will be shortened
5–10% of women will have persistent amenorrhoea
Time to effect of all POP
48hrs
What is considered a missed pill for LNG POP?
> 3hrs (ie >27hrs since last pill)
What is considered a missed pill for NET POP?
> 3hrs (ie >27hrs since last pill)
What is considered a missed pill for DSG POP?
> 12hrs (ie >36hrs since last pill)
Advice to a woman who is late taking POP
Take as soon as remember even if this means two on same day, condoms 48hrs. EC if upsi after missed pill and <48hrs from restarting
Does weight impact on efficacy of POP
No (but might have more BTB)
If a POP user vomits 3hrs after taking her pop does she need to retake it?
No FSRH guidelines = <2hrs need to retake and if >3hrs since time to take tx as missed pill
Drug interactions reducing efficacy for POP
Liver enzyme inducers
Epileptics: carbamazepine, phenobarbital, phenytoin, topiramate (technically can be considered if <200mg by specialist)
Antibiotics: rifampicin/rifabutin
HIV ARVs: efavirenz/nevirapine/ritonovir
St John’s wort
Others: modafinil, bosentan, apreitant, lumacaftor/orkembi
Describe the impact of using POP whilst on lamotrigine
POP may reduce lamotrigine levels and decrease seizure control - best started with monitoring of lamotrigine levels and with neuro input
What advice should be give to a woman using rifampicin for the treatment of TB with respect to her contraception
If short course <2/12 condoms should be advised during use and for 28 days after if using POP/CHC/Implant contraception
If using longer than 2/12 should be advised to consider switching to IUC/depo