14 - Contraception Flashcards
What are the following for the contraceptive implant:
- MOA
- Indications and contraindications
- Correct use
- Benefits/Side effects
MOA: Progestrogen only (etonogestrel). Inhibits ovulation and thickens cervical mucus.
Indications: contraception, may help dysmenorrhoea
Contraindications: pregnancy, St John’s Wort, Enzyme inducing drugs (e.g carbamazepine/griseofulvin/TB), history of breast cancer/heart disease/liver disease/unexplained pV bleeding
Correct Use: Lasts 3 years. Need to use condoms for 7 days after implantation
Benefits: no effect on bone mineral density, may be protective of endometrial cancer, can be used breastfeeding, can be used in all BMIs, little risk of VTE, 99% effective, fertility returns straight away
Side effects: doesn’t prevent STIs, changes/irregularity in menstrual bleeding rule of thirds
What are the following for the IUD:
- MOA
- Indications and contraindications
- Correct use
- Benefits/Side effects
MOA: thickens cervical mucus, toxic to sperm/doesn’t allow capacitation, changes endometrial lining stopping implantation
Indications: long lasting birth control, emergency contraception up to 5 days after unprotected sex
Contraindications: history of PID, recent STI exposure, current pregnancy/4 weeks post partum, uterine structural abnormalities, current gynae malignancy, allergy to copper, history of DVT/liver disease/breast cancer
Correct Use: immediate contraceptive after insertion, needs to be replaced after 5-10 years. 6 week check up and then pt needs to check strings every 1/12
Benefits/Side effects: heavier longer periods, uterine perforation, ectopics,
return of fertility immediately, see image for more
What are the main contraindications for progesterone only contraceptives?
What are the following for the IUS:
- MOA
- Indications and contraindications
- Correct use
- Benefits/Side effects
MOA: progestogen thins endometrium preventing implantation also thickened cervical mucus. Stops ovulation
Indications: first line therapy for menorraghia as often causes amenorrhea, second line for dysmenorrhea, contraception
Contraindications: see image
Correct Use: effective immediately if inserted first 7 days of cycle, otherwise use condoms for 7 days. Lasts for 3-5 years. check for pregnancy and STIs before insertion
Benefits: good if forget to take pills, lighter periods/amenorrhea, fertility returns immediately, can be used if COCP contraindicated
Side effects: spotting/irregular bleeding for first 6/12, risk of perforation, risk of STIs/PID, ectopic risk, body my expel it
What are the following for the Depo Provera (medroxyprogesterone acetate) injection:
- MOA
- Indications and contraindications
- Correct use
- Benefits/Side effects
MOA: supresses LH and FSH so no ovulation, thickens cervical mucus so barrier to sperm entry, thins endometrium
Indications: long term contraception
Contraindications: current breast cancer, Severe arterial disease, Pregnancy, Vascular disease, People who want to return to fertility in the near future
Correct Use: deep IM every 12 weeks (14 weeks max if 12weeks+5 check not pregnant and advise condoms for 7 days).
If day 1-5 of cycle effective immediately, otherwise condoms for 7 days. 94-99% effective
Benefits: very effective, can be used when breastfeeding/migraines, may lighten bleeding/pms, no known interactions with any drugs, reduce risk of ovarian/endometrial cancer, can be used in all BMIs
Side Effects: can take a year for fertility to return, unscheduled bleeding, weight gain, loss of bone mineral density if using over a year so review every 2 years for osteoporosis, increased risk of breast cancer, need to stop over age 50
What are the following for the combined contraceptive patch Evra:
- MOA
- Indications and contraindications
- Correct use
- Benefits/Side effects
MOA: preventing ovulation, thinning the endometrial lining and thickening cervical mucus
Indications: contraception and menstrual symptoms
Contraindications: breast feeding, up to 6 weeks post partum, current breast cancer, over 35, smoking over 15/day, see image
Correct use: apply to upper arm, abdomen, buttock or back for 7 days for three weeks then a week off. 91-99% effective.
Use barrier method when starting unless starting on day 1-5 of cycle. N+V/Diarrhoea do not affect. Detached patch >48 hours may need emergency contraception if not used for 7 days before
Benefits: as effective as COCP, not affected by vomiting
Side effects: delay in fertility return by few months, skin irritation, increased risk of VTE, breast discomfort, dysmenorrhea, n+v, liver inducing enzymes may decrease effectiveness
What are the following for the latex free combined NuvaRing:
- MOA
- Indications and contraindications
- Correct use
- Benefits/Side effects
MOA: prevents ovulation, thins the endometrial lining and thickens cervical mucus
Indications: contraception
Contraindications: see image
Correct use: place in for 21 days then remove for 7. can be removed for up to 3 hours if uncomfortable in sex. if 8 or more days since ring removed consider emergency contraception
Benefits: not effected by vomiting and diarrhoea, effective as the pill
Side effects: foreign body sensation, vaginal infections, headaches, delay in fertility return for few months, can be broken or expelled during use, blood pressure increase, risk of VTE
What are the following for the COCP:
- MOA
- Indications and contraindications
- Correct use
- Benefits/Side effects
MOA: preventing ovulation, thinning the endometrial lining and thickening cervical mucus. can be monophasic or phasic
Indications: acne, contraception, symptom control of endometriosis, hyperadrogenism (PCOS), menstrual disorders like menorraghia/dysmennorhea
Contraindications: over 35, history of DVT/VTEs, migraines with aura, breastfeeding, BMI>35, smoker, HTN, breast cancer, liver tumour
Benefits: lighter less painful menses, reduced acne, protective of certain cancers, normal fertility returns straight away
Side effects: less effective than long acting methods, breast pain/tenderness, N+V, abdominal pain, headache, mood changes, risk of VTE, risk of breast/cervical cancer
What are the rules for missed pills when on the COCP?
- If one pill missed take pill ASAP and do not need emergency contraception as long as the HFI was 7 days and all pills taken normal before break. No condoms needed
- If 2 or more missed in week 1 need to take last missed pill ASAP. Need to consider emergency contraception and use condoms for next 7 days
- If 2 or more missed in week 2 or 3 same as above but don’t need emergency contraception if 7 days before correct pill taking
- If less than 7 days left of pills skip break!!
- Consider follow up pregnancy tests after emergency contraception
What are the following for the POP:
- MOA
- Indications and contraindications
- Correct use
- Benefits/Side effects
MOA: primarly thickens cervical mucus, only stops ovulation in 60%, thin endometrium, reduced activity of cilia in tubes
Indications: contraceptive for when oestrogen is Cx
Contraindications: breast cancer (only UKMEC 4), cirrhosis, liver tumours, stroke, SLE, enzyme inducing drugs
Correct use: need to use contraception for 48 hours if starting after day 1-5 of cycle. need to take at same time everyday within 3 hour frame, no break between packs
Benefits: reduces risk of endometrial cancer, desogesterel can manage dysmenorrhea, immediate return of fertility, good if oestrogen Cx
Side effects: breast tenderness, unscheduled bleeding, headaches, acne, risk of ectopics, risk of breast cancer, increased risk of ovarian cysts
How does vomiting and diarrhoea affect the COCP/POP?
- If vomit within 2 hours of taking pill need to take another one
- If more than 6-8 watery stools a day need to use other methods of contraception. If IBD not suitable to use COCP for contraception
What should you do when missing a POP?
- Missed pill if over 3 hours late (or 12 hours with desogesterol)
- Take pill ASAP and use condoms for next 48 hours
- Consider emergency contraception if unprotected sex occured between missed pill and 48 hours in taking next pill
What are the following for the diaphragm/cap with spermicide (barrier contraception like condoms):
- MOA
- Indications and contraindications
- Correct use
- Benefits/Side effects
MOA: they cover the cervix to stop sperm entry. Caps are used with spermicide which is extra efficacy
Indications: contraception
Contraindications: toxic shock syndrome, vaginal prolapse, latex allergy, cervical cancer, high risk of HIV, less than 6 weeks post partum
Correct Use: check for holes before insertion, apply spermicide (no oil-based), place in vagina up to 3 hours before intercourse and leave in for a minimum of 6 hours after. Needs to be removed 30-48 hours after
Assess after 1-2 weeks by doctor to see if correct fit
Benefits: allows spontaneity, no interactions with any other drugs, little adverse effects
Side effects: STI, need training to fit, weight gain >3kg or pregnancy will need refitting, higher risk of UTIs, low efficacy around 88% typical use, allergies to cap/spermicide
What are the following for female internal condoms:
- MOA
- Indications and contraindications
- Correct use
- Benefits/Side effects
MOA: barrier to sperm
Indications: contraception
Contraindications: latex allergy
Correct use: can be applied up to 8 hours before intercourse
Side effects: penis may end up between condom and vaginal wall so perfect use hard, 95% effective, may be noisy, not widely available
How do fertility awareness methods work and who is not suitable to use this method?
- Need to record body temperature, menstrual cycle length and cervical mucus changes. Can take 3-6 cycles to learn the method. When highly fertile use barrier methods
- Conditions that affect cervical mucus: menstrual irregularities first 4 weeks post-partum, recent use of hormonal contraception, drugs like cold remedies, analgesics, tetracyclines
- Also cannot be used in patients who “cannot” get pregnant e.g on teratogenic drugs, Eisenmenger syndrome