Contraception and infertility - Drugs

26 important questions on Contraception and infertility - Drugs

COC monophasic: 24 active combined/2 EE/2 inactive w iron

Lo Loestrin Fe
(very low dose estrogen used= 10 mcg)

COC extended cycle: 84 days of EE + LNG followed by 7 placebo days

Jolessa

COC extended cycle: 84 days of EE + LNG followed by 7 days of low dose EE

Seasonique, Amethia, Camrese, Camrese Lo
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Progestin only "mini pill"/POP: fixed dose of norethindrone

Erin, Camila, Nora-BE, Incassia

Progestin only "mini pill" approved for use without Rx

Opill

What do POPs require?

Good adherence- take daily within 3 hrs of scheduled time

Why are POPs sometimes used for migraine prophylaxis and safe in women who have migraines with aura?

Estrogen cannot be used with this type of migraine due to risk of stroke

Why do patches have an even higher risk of thromboembolism?

Higher estrogen exposure- avoid in anyone with high clotting risk

Weight considerations with patches

Increased TE risk if BMI >/= 30 [avoid] and less effective if >198 lbs (90 kg): xulane, zafemy.
Decreased efficacy: Twirla

With extended cycle COCs, how often does period occur?

Every 3 mo

Dose of estrogen and progestin in monophasic COC

Same amount throughout active pill days

Which COCs mimic the estrogen and progesterone levels during the menstrual cycle?

Biphasic, triphasic and quadriphasic pill packs

Progestin with highest clot risk

Drospirenone

Other progestins with low anti-androgenic activity

Norgestimate, desogestrel, dienogest

How do hormonal contraceptives work?

Inhibit production of FSH and LH, which prevents ovulation.
Also alter cervical mucus, which stops sperm from penetrating egg.

Even though reducing estrogen dose can reduce risk of side effects, what can happen if the dose is too low?

Breakthrough bleeding (spotting), esp during early-mid part of cycle

Recognizable symptoms of clots (DVT, PE)

ACHES:
Abdominal pain that is severe- mesenteric or pelvic vein thrombosis
Chest pain- SOB can indicate PE (clot in lungs)
Headaches- sudden/severe with vomiting or one side weakness can indicate stroke
Eye problems- blurry vision, flashing lights, partial/complete vision loss can indicate clot in eye
Swelling or sudden leg pain- can indicate DVT (clot in leg)

Why can drospirenone NOT be used with kidney, liver or adrenal gland disease?

It increases potassium (K-sparing diuretic)

Injectable depo-provera can cause what?

Loss in bone mineral density

Antibiotics that can decrease efficacy of hormonal contraceptives

CYP450 inDucers: rifampin, rifabutin, rifapentine

After rifampin has been stopped, how long is a back-up contraception needed?

6 weeks

Can antifungals decrease efficacy of hormonal contraceptives?

Yes (eg. Griseofulvin)

Misc. Drugs that decrease efficacy of hormonal contraceptives

St. John's wort
Smoking tobacco

Ritonavir-boosted PIs
Colesevelam

Return to fertility for injectable medroxyprogesterone (depo-provera)

Up to 18 mo (long)

Daily recommendation with injectable medroxyprogesterone

Take the recommended daily intake of calcium and vitamin D

Return to fertility for COC, POP, IUD and implants

2-4 mo (short)

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