Contraception Flashcards
Mechanism of action COCP
Inhibits ovulation
Mechanism of action progesterone only pill (excluding desogestrel)
Thickens cervical mucus
Mechanism of action desogestrel-only pill
Primary: inhibits ovulation
Also: thickens cervical mucus
Mechanism of action injectable contraceptive (medroxyprogesterone acetate)
Primary: inhibits ovulation
Also: thickens cervical mucus
Mechanism of action implantable contraceptive (etonogestrel)
Primary: inhibits ovulation
Also: thickens cervical mucus
Mechanism of action IUD
Decreases sperm motility and survivalMechanism of action
Mechanism of action IUS (levonorgestrel)
Primary: prevents endometrial proliferation
Also: thickens cervical mucus
Mechanism of action levonorgestrel as emergency contraception
Inhibits ovulation
Mechanism of action ulipristal as emergency contraception
Inhibits ovulation
Mechanism of action IUD as emergency contraception
Primary: toxic to sperm and ovum
Also: inhibits implantation
Alternative condoms in latex allergy
Polyurethane
When to wear/change combined contraceptive patch (Evra)
For first 3 weeks, patch worn every day and needs changing each week
During 4th week, patch not worn - withdrawal bleed
Action if Evra patch change delayed at end of week 1 or 2
If less than 48 hours, change immediately and no further action
If greater than 48 hours, change immediate and barrier contraception for 7 days. If UPSI in last 5 days, emergency contraception
Action if Evra patch change delayed at end of week 3
Patch removed, new patch applied on usual cycle start date of next cycle, even if withdrawal bleed is occurring. No additional contraception
Action in Evra patch change delayed at end of patch-free week
Additional barrier contraception for 7 days
Advantages COCP
Contraceptive effects reversible on stopping
Usually makes period light, regular, less painful
Conditions COCP reduces risk of
Ovarian cancer
Endometrial cancer
Colorectal cancer
PID
Ovarian cysts
Benign breast disease
Acne
Disadvantages COCP
May forget
No protection against STI
Temporary side effects - headache, nausea, breast tenderness
Conditions COCP increases risk of
Breast cancer
Cervical cancer
Stroke
Ischaemic heart disease
UKMEC categories
UKMEC 1 - no restriction
UKMEC 2 - advantages generally outweigh disadvantages
UKMEC 3 - disadvantages generally outweigh advantages
UKMEC 4 - unacceptable health risk
UKMEC 3 COCP
- More than 35 and smoking less than 15/day
- BMI >35
- FHx VTE in first degree relative <45
- Controlled HTN
- Immobility, e.g. wheel chair user
- BRCA1/2
- Current gallbladder disease
UKMEC 4 COCP
- More than 35 and smoking over 15 cigarettes per day
- Migraine with aura
- History of VTE or thrombogenic mutation
- History of stroke or IHD
- Breastfeeding <6 weeks postpartum
- Uncontrolled hypertension
- Current breast cancer
- Major surgery with prolonged immobilisation
- Positive antiphospholipid antibodies
Diabetes and COCP
Diabetes mellitus diagnosed >20 years ago UKMEC 3 or 4 depending on severity
Additional contraception when starting COCP
If started within first 5 days of cycle, no need for additional contraception
If started at any other point, alternative contraception for 7 days
Causes of reduced efficacy of COCP
- Vomiting within 2 hours of taking
- Medication that may induce diarrhoea or vomiting, e.g. orlistat
- Liver enzyme inducing drugs
COCP one missed pill
Take last pill, even if means taking 2 pills in one day
No additional contraceptive needed
COCP two missed pills
Take last pill even if taking two pills in one day, leave any earlier missed pills
Alternative contraception until taken pills for 7 days in a row
COCP two missed pills emergency contraception week 1 (days 1-7)
Emergency contraception should be considered if UPSI in pill free interval or week 1
COCP two missed pills emergency contraception week 2 (days 8-14)
No need for emergency contraception
COCP two missed pills emergency contraception week 3 (days 15-21)
Finish pills in current pack (1/day) then start a new pack next day - omit pill free interval
Contraception UKMEC 2 in ≥40
COCP (≥40)
Depo-provera (>45)
Advantages COCP in perimenopausal period
May help maintain bone mineral density
May help reduce menopausal symptoms
Pill containing <30 µg oestrogen may be more suitable
Limitations depo-provera in >40
May be delay in return of fertility of up to 1 year for women >40 years
Associated with small loss in bone mineral density which is usually recovered after discontinuation
When to stop non hormonal contraception in menopausal women
If <50, after 2 years of amenorrhoea
If ≥50, after 1 year of amenorrhoea
Age to stop COCP
50 years - switch to non-hormonal or progesterone-only method if ongoing contraception needed
Age to stop depo-provera
50 years - switch to either non-hormonal method and stop after 2 years of amenorrhoea, or switch to progesterone only method and stop after 1 year if FSH ≥30 or at 55 y/o