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Progestin-only contraceptive (perimenopause)

Slynd

Drospirenone 4 mg — progestin-only pill

A 24/4 progestin-only pill with antiandrogenic and anti-mineralocorticoid activity — estrogen-free contraception for perimenopausal women, with a more forgiving missed-pill window than older POPs.

Medically reviewed by Kindr Health Clinical Team · Last reviewed 2026-07-03

What it is

Slynd is an oral progestin-only contraceptive (POP) containing 4 mg of drospirenone, taken as 24 active pills followed by 4 inactive pills (a 24/4 regimen). It was FDA-approved for pregnancy prevention.

Drospirenone is a synthetic progestin derived from spironolactone. Unlike older progestins, it has anti-mineralocorticoid activity (reduces water retention) and antiandrogenic activity (can help with acne and androgenic symptoms).

Because it contains no estrogen, it is an option for perimenopausal women who need contraception but have estrogen contraindications — including migraine with aura, smoking over 35, a history of VTE, or elevated cardiovascular risk.

How it works

Drospirenone suppresses ovulation primarily by inhibiting the mid-cycle LH surge, and thickens cervical mucus to reduce sperm penetration. The 24/4 regimen (rather than the traditional 28-active POP) allows a more consistent suppression of ovarian activity.

The 24-hour missed-pill window: if a pill is missed by less than 24 hours, no backup contraception is needed. This is more forgiving than traditional POPs, which require backup after a delay of more than 3 hours.

Who it's for

Perimenopausal women who need contraception but cannot take estrogen
Women with migraine with aura, smokers over 35, or a VTE history who need effective contraception
Women who want a pill with antiandrogenic benefit (acne, mild androgenic symptoms)

Who should not take it

Patients with renal or adrenal insufficiency — drospirenone increases potassium, risk of hyperkalemia
Patients on potassium-sparing diuretics, ACE inhibitors, ARBs, or chronic NSAID therapy (hyperkalemia risk)
Pregnancy or known pregnancy
Women seeking treatment for vasomotor symptoms (hot flashes) — Slynd does not treat these; HRT or a non-hormonal option like fezolinetant or paroxetine would be considered

Common side effects

Unscheduled or irregular bleeding (most common in the first months, often improves)
Nausea, headache, breast tenderness
Acne (may improve due to antiandrogenic effect, but can worsen initially in some)
Rare: hyperkalemia in patients with renal impairment or interacting medications

Evidence summary

FDA approval based on a phase 3 trial demonstrating high contraceptive efficacy with the 24/4 drospirenone regimen.
The 24-hour missed-pill window is supported by pharmacokinetic studies showing maintained ovulation suppression.

FAQ

Is Slynd hormone replacement therapy (HRT)?

No. Slynd is a progestin-only contraceptive. It prevents pregnancy but does not treat menopausal vasomotor symptoms or genitourinary syndrome. Women in perimenopause who also have hot flashes, vaginal dryness, or sleep disruption may need HRT or a non-hormonal menopause therapy in addition to (or instead of) contraception.

Can I take Slynd and HRT at the same time?

It depends on your clinical situation. Contraception and menopause symptom treatment are separate goals. Your Kindr provider evaluates whether both are appropriate or whether a single regimen better fits your needs. Do not combine them without clinical guidance.

How is Slynd different from other mini-pills?

Traditional progestin-only pills (e.g., norethindrone) use a 28-active regimen and require backup contraception if a pill is more than 3 hours late. Slynd uses a 24/4 regimen with a 24-hour missed-pill window, making it more forgiving.

Does Slynd help with perimenopause symptoms?

Its antiandrogenic activity can help with acne and mild androgenic symptoms, and it may reduce water retention. It does not treat hot flashes, night sweats, or vaginal dryness — those require HRT or a targeted non-hormonal therapy.

When can I stop Slynd?

Contraception is recommended until menopause is confirmed (12 months without a period). Your provider helps time the transition off contraception and, if needed, onto menopause care.

Sources

Medically reviewed by Kindr Health Clinical Team
Kindr Health Inc. — Editorial & Clinical Team (physician-supervised)
NPI 1609792902 · Last reviewed: July 3, 2026

Other medications

Estradiol →

Hormone therapy

Micronized Progesterone →

Hormone therapy

Testosterone (low-dose, female-physiologic) →

Hormone therapy

Semaglutide →

GLP-1 weight care

This page is educational and is not a substitute for a clinical evaluation. Whether any medication is appropriate for you depends on your full medical history. Kindr providers make individualized prescribing decisions during a clinical visit.