Premarin

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What Is Premarin?

Premarin is a branded generic of conjugated estrogens, a systemic oral estrogen used as menopausal hormone therapy (MHT / HRT). Estrogen replaces the hormone lost after natural or surgical menopause, relieving the symptom cluster known as the climacteric syndrome.

Strengths: 0.3 mg, 0.625 mg, 1.25 mg (oral tablets, 28 or 54-tablet packs). Manufactured by Wyeth/Pfizer.

Genitale herpes (eerste episode):

• Vasomotor symptoms (hot flushes, night sweats) — most effective treatment available, ~75–90% reduction in trials.
• Genitourinary syndrome of menopause — vaginal dryness, dyspareunia, recurrent UTIs. Vaginal estrogen is preferred for symptoms limited to the genitourinary tract.
• Postmenopausal osteoporosis prevention — reduces fracture risk by ~30–50% with extended use. No longer first-line when bisphosphonates or denosumab are indicated.
• Premature ovarian insufficiency (POI) — physiological replacement in women under 40 with premature menopause.
• Female-to-male → female gender-affirming hormone therapy (off-label on this site; specialist-guided).

Critical: Progestin Opposition

If you have a uterus, you must take estrogen combined with a progestin. Unopposed estrogen stimulates endometrial proliferation, raising endometrial cancer risk ~8–15×. Options:

• Combined continuous — estrogen daily + progestin daily (no withdrawal bleed after 3–6 months)
• Sequential (cyclic) — estrogen daily + progestin 10–14 days per month (withdrawal bleed each cycle)
• Mirena IUD — delivers local progestin to the endometrium; allows estrogen monotherapy elsewhere

Women who have had a hysterectomy can take estrogen alone without a progestin. See our progesterone products: Endogest, Gestheal, Susten Capsule.

Hoe in te nemen

1. Take one tablet once daily, at roughly the same time each day, with water. With or without food.
2. Start at the lowest effective dose — typically 0.3 mg conjugated estrogens or 0.5–1 mg estradiol — and titrate up only if symptoms are incompletely controlled after 4–6 weeks.
3. If cycle-regimen is used, the progestin is taken for the last 10–14 days of each 28-day cycle; withdrawal bleeding is expected.
4. For continuous-combined regimen, take both hormones daily; irregular bleeding may occur for the first 3–6 months.
5. Use the lowest effective dose for the shortest effective duration. Review annually with a clinician. Most guidelines recommend discontinuation after 3–5 years.

Risks and Safety (WHI and Follow-Up Evidence)

The Women’s Health Initiative (WHI) trials redefined HRT risk understanding. Key findings per 10,000 women per year of combined estrogen-progestin HRT:

• Breast cancer: +8 cases (with progestin); estrogen alone did not raise breast cancer risk over ~7 years in WHI
• Stroke: +8 strokes
• VTE (DVT/PE): +18 events — highest risk in first year; oral > transdermal
• Coronary heart disease: +7 events in older HRT starters (60+), but possibly protective in younger starters (<60)
• Hip fracture: −5 (protective)
• Colorectal cancer: −6 (protective, combined HRT)
• Endometrial cancer: +1 (lower with progestin opposition)

Risk-benefit is most favourable in women under 60 with severe symptoms and no contraindications. Transdermal estrogen (patch, gel) may reduce VTE risk vs oral.

Bijwerkingen

Vaak voorkomend: breast tenderness, nausea, headache, fluid retention, mood changes, vaginal bleeding (normal in first 3–6 months of continuous-combined regimen).

Minder vaak: melasma, gallstones, contact-lens intolerance, libido changes.

Serious (rare) — seek urgent care: chest pain, shortness of breath, severe leg swelling (VTE/PE), sudden severe headache with neurological changes (stroke), breast lump, yellowing of skin/eyes (liver problem), heavy or prolonged vaginal bleeding.

Who Should Not Take Premarin

• Current, suspected, or history of breast cancer or estrogen-dependent cancer
• Current or history of VTE (DVT, PE), thrombophilia, active thromboembolic disease
• History of stroke, TIA, or recent MI
• Active liver disease or cholestatic jaundice history (with previous pregnancy or estrogen use)
• Undiagnosed vaginal bleeding
• Known pregnancy
• Endometrial hyperplasia (investigate first)
• Overgevoeligheid bekend

Geneesmiddelinteracties

• Enzyme inducers (rifampicin, phenytoin, carbamazepine, St John’s Wort) reduce estrogen levels — higher-dose estrogen or alternative route may be needed.
• Thyroxine (levothyroxine): estrogen raises thyroid-binding globulin, may increase thyroxine requirement.
• Warfarine: estrogen reduces warfarin effect slightly; monitor INR.
• Grapefruitsap: may raise estrogen levels modestly.

Opslag

Store at room temperature (15–25 °C / 59–77 °F), away from moisture and direct light. Keep in original packaging. Keep out of reach of children.

Veelgestelde vragen

When should I start HRT?

Modern guidelines suggest starting HRT within 10 years of menopause onset or before age 60 (“window of opportunity”) for best cardiovascular safety profile. Starting HRT after age 65 has a less favourable risk-benefit ratio unless severe symptoms persist.

Do I need a progestin if I have a uterus?

Yes — always. Unopposed estrogen raises endometrial cancer risk 8–15×. Take estrogen with micronized progesterone (endogest, gestheal, etc.), dydrogesterone, medroxyprogesterone, or a Mirena IUD.

How long can I stay on HRT?

Modern practice: lowest effective dose, shortest duration — typically 3–5 years, reviewed annually. Extended use is appropriate for severe symptoms, premature menopause, or osteoporosis; discussed on an individual basis.

Is HRT safer as a patch or gel than a pill?

Transdermal estrogen has a lower VTE risk (no first-pass hepatic effect) and is preferred for women with VTE risk factors, migraine, or hepatic concerns. Oral is convenient and well-studied but carries slightly higher thrombotic risk.

What about bioidentical hormones?

Estradiol (the molecule in Progynova) is bioidentical. Conjugated estrogens (Premarin) are not strictly bioidentical. Micronized progesterone is bioidentical. “Compounded bioidentical” custom-mixed products at non-standard doses have no proven advantage and often lack quality control — most gynaecology societies do not recommend them.

Will HRT cause breast cancer?

Risk depends on type and duration. Estrogen-only (women without uterus): no clear breast cancer risk increase over ~7 years in WHI. Combined estrogen-progestin: ~+8 cases per 10,000 women per year. Risk returns to baseline within 2–5 years of stopping.

Will HRT help my mood or sleep?

Often — especially if vasomotor symptoms are disrupting sleep or causing irritability. HRT is not an antidepressant; severe mood symptoms may need separate treatment.

Can HRT cause weight gain?

Weight gain is more commonly linked to the perimenopausal transition itself (shifting body composition, declining estrogen) than HRT. Modern low-dose HRT is typically weight-neutral.

What should I do if I have vaginal bleeding on HRT?

Expected for 3–6 months on continuous-combined HRT. Withdrawal bleeding is expected on cyclic HRT. Unexpected or prolonged bleeding beyond 6 months needs clinical review (endometrial biopsy or ultrasound) to rule out endometrial hyperplasia or cancer.

What about non-hormonal alternatives?

For vasomotor symptoms: SSRIs/SNRIs (paroxetine, venlafaxine), gabapentin, clonidine, cognitive-behavioural therapy, fezolinetant (newer neurokinin-3 antagonist). For genitourinary symptoms: vaginal moisturisers, lubricants, ospemifene. Discuss with a clinician.

Related Hormone & Women’s Health Products

• Premarin Cream (Vaginal Estrogen)
• Progynova (Estradiol Valerate)
• Endogest (Progesterone 100 mg)
• Gestoford (Progesterone 100 mg)
• Gestheal (Progesterone 200 mg)
• Susten Capsule (Progesterone)
• Susten Injection (Progesterone)

Gerelateerde alternatieven

Andere producten in Women's Health die klanten ook bekijken:

• Ovral G
• Cb-Lin
• Progynova
• Gestheal
• Evalon Cream

More options in Hormone Replacement Therapy (HRT) Medication for Menopause

Gerangschikt op recente bestelvolumes van MedsBase — wat andere klanten in deze categorie kiezen.

Cabgolin

US$14.00 – US$68.00Faixa de preço: US$14.00 até US$68.00

Progynova

US$24.00 – US$134.00Faixa de preço: US$24.00 até US$134.00

Gestheal

US$20.00 – US$210.00Faixa de preço: US$20.00 até US$210.00

Gestoford

US$13.00 – US$128.00Faixa de preço: US$13.00 até US$128.00