Pharmacology Flashcards
If 1 pill missed of COCP ?
Take pill even if have to take 2 pills in one day and carry on as normal
No emergency contraception needed
If 2 pills missed of COCP in week 1?
Emergency contraception needed (if has had intercourse in the pill free week or week 1)
Take the last pill even if have to take 2 in one day and omit earlier missed pills. Then continue as normal.
Use condoms/other contraception for 7 days
If 2 pills missed of COCP in week 2?
Take the last pill even if have to take 2 in one day and omit earlier missed pills. Then continue as normal.
Use condoms/other contraception for 7 days
Emergency contraception not needed
If 2 pills missed of COCP in week 3?
Take the last pill even if have to take 2 in one day and omit earlier missed pills. Then continue as normal.
Use condoms/other contraception for 7 days
Emergency contraception not needed
should finish the pills in her current pack and start a new pack the next day; thus omitting the pill free interval
What is used as emergency contraception?
Levonorgestrel (a progesterone) - 1.5mg single dose
EllaOne/Ulipristal (progesterone receptor modulator) - 30mg single dose
Copper IUD
When can levonorgestrel (levonelle) be used as emergency contraception?
Within 72 hours of UPSI
Dose must be repeated if she vomits within 2 hours of taking
When can EllaOne/Ulipristal be used as emergency contraception?
120 hours after UPSI
Who should not receive Ulipristal?
Caution in severe asthmatics
How does Ulipristal work as emergency contraception?
Inhibits ovulation by inhibiting LH secretion / no LH surge (progesterone receptor modulator)
Does Ulipristal effect regular hormonal contraception?
Yes - reduce the effectiveness of other hormonal contraception:
- COCP should be started/restarted 5 days after taking
- POP should be restarted 7 days later
When can an IUD be used as emergency contraception?
Within 5 days of UPSI OR up to 5 days after ovulation
Pharmacological mx of ectopic pregnancy
Methotrexate
What drugs are used in the management of urge incontinence?
Antimuscarinics: Oxybutynin, Tolterodine & Darifenacin
B3 agonist: Mirabegron
What drug is used for symptomatic relief in obstetric cholestasis?
Ursodeoxycholic acid
Which antibiotic is used for the treatment of group b strep?
Benzylpenicillin
What SSRI can be used in postnatal depression?
Paroxetine (Fluoxetine has too long a half life)
What is the name of the contraceptive patch?
Evra patch
How is the contraceptive patch taken/used?
4 weeks - wear for 3 weeks and have 1 week off (need to change the patch weekly for those first 3 weeks)
Delay in changing the contraceptive patch at the end of week 1 or 2?
If <48 hours change immediately and no other precautions needed
If >48 hours change immediately and use barrier contraception for the next 7 days.
Consider emergency contraception if the lady has had UPSI during this patch free interval or in the past 5 days
Delay in removal of the contraceptive patch at the end of week 3?
Remove ASAP and apply new patch on the usual cycle start day
If forget to reapply patch at the end of patch free week (week 4)?
Use barrier contraception for the next 7 days
What antibiotic is used for mastitis and how long for?
10-14 days of Flucloxacillin
Time until contraceptives are effective?
IUD - instant
POP - 2 days
COCP, injection, implant, IUS - 7 days
What contraception can be used in a patient with breast cancer?
Copper IUD
ALL hormonal contraceptives are contraindicated in breast cancer
What medication is safe to use in pregnancy for thrush/candidiasis?
And why can’t fluconazole be used?
Clotrimazole Pessary
Fluconazole is contraindicated in pregnancy due to risk of congenital abnormalities
Dose of Folic Acid used in Pregnancy
Normal risk of neural tube defects: 0.4mg a day pre-conception and continue till 13 weeks
5mg daily if higher risk of neural tube defects
How long after stopping the COCP does breast cancer risk return to that of a normal woman / woman not on COCP ?
10 years after stopping COCP
How long can a copper IUCD be left in for ?
5-10 years
How long can the Mirena IUS be left in for?
Up to 5 years
What are the risks and side effects associated with the IUCD ?
Expulsion Perforation PID / infection from insertion Increased risk of ectopic pregnancy Dysmenorrhoea Menorrhagia
List some contraindications to the IUCD
Copper allergy Wilson's disease Pregnancy Acute PID Cervical cancer Distorted uterine cavity (fibroids)
How does IUCD work as a contraceptive?
Prevents implantation
Toxic to sperm
What’s the name of the progesterone implant?
Nexplanon
How often does the nexplanon implant need to be changed?
After 3 years
How does the nexplanon implant work?
Inhibits ovulation (Progesterone inhibits LH)
Side effects / negatives of the nexplanon implant ?
Delay returning to fertility
Erratic bleeding
Common side effects of the COCP
- Breast tenderness
- VTE / stroke risk increased
- Increased risk of breast cancer (and cervical cancer)
- Mood changes
- Weight gain
- Headaches
- Bloating
- Reduced libido
- Breakthrough bleed
What can reduce the effectiveness of the COCP ?
Ullipristil Acetate (emergency contraception, progesterone receptor modulator)
CYP450 INDUCERS
(Carbamazepine, Rifampicin, Alcohol, Phenytoin, Griseofulvin/Gliclazide, St John’s Wart)
MOA COCP
Inhibits ovulation
Thickens cervical mucus
Prevents implantation (atrophic endometrium and inhibits progesterone receptor synthesis in the endometrium)
Contraindications to COCP
Absolute (UKMEC 4):
- > 35 and smoking >15 a day
- Migraine with aura
- Personal history of VTE disease or thrombogenic mutation
- History of stroke or IHD
- Uncontrolled HTN
- Breast feeding <6 weeks postpartum
- Breast cancer (current)
- Major surgery / prolonged immobilisation
Relative (UKMEC 3):
- > 35 and smoking <15 a day
- BMI >35
- FMH thromboembolism (first degree relative)
- Controlled HTN
- Known BRCA1/2 gene mutations
MOA POP
Thickens cervical mucus Inhibits implantation (inhibits progesterone receptor synthesis in the endometrium)
Inhibits ovulation in some women
SE POP
Erratic bleeding Breast tenderness Weight gain Acne Less effective than COCP / pregnancy
Contraindications for the POP
Current breast cancer
Trophoblastic disease
Severe liver disease
What are the hourly windows for missing the POP
Levonorgestrel = 3-4 hour window
Cerazette (desogestrel) = 12 hour window
How often should the progesterone depot injection be given?
Every 3 months
What is the COC ring called?
Nuvaring
What are the side effects of the Mirena IUS
Increased risk of PID
Increased risk of ectopic pregnancy
Perforation
Expulsion
List some examples of ‘natural methods’ of contraception
Withdrawal
Breast feeding (90% effective in the first 6 months)
Calendar method
Assess cervical mucus (thin until ovulation, thick after ovulation)
Basal body temperature (increases after ovulation)
Measure LH surge using ‘persona’ urine test
List some examples of barrier contraception
Condoms - male and female Diaphragm Cervical cap Sponge Spermicides (nonoxinol-9)
Who shouldn’t use spermicides as contraception?
HIV positive: increases risk of transmission as it irritates the vagina
What is the failure rate associated with COCP and POP
0.3%
What is the failure rate associated with the IUCD
0.6%
What is the failure rate associated with progesterone injection
0.3%
What is the failure rate associated with Mirena IUS
0.1%
What is the failure rate associated with condoms (male and female)
Male - 2%
Female - 5%
What is the failure rate associated with the diaphragm
6%
What is the failure rate associated with natural methods
9-25%
What is the failure rate assocaited with vasectomy
0.1%
What are the Fraser guidelines?
Those under 16 y/o may be prescribed contraception without parental permission if:
- They understand the doctors advice
- They cannot be persuaded to inform their parents
- They are likely to begin or continue having intercourse with or without contraception
- Physical or mental health will suffer without treatment
- It is in the young person’s best interest
What is the difference between the Fraser guidelines and Gilick competence?
Fraser guidelines apply to contraception ONLY, whereas Gilick competence applies to children <16 who have legal capacity to consent to examination and treatment
What drug should be given alongside inserting the IUD?
Azithromycin prophylaxis if STI screen results unavailable
MOA Misoprostol
Prostaglandin analogue
Causes myometrium contractions
Risk of cancers associated with COCP
Increased risk:
- Breast
- Cervical
Reduced risk:
- Endometrial
- Ovarian