Progestin-Only Pill

How it works

Progestin thickens cervical mucus, making it harder for sperm to pass. The endometrium becomes thinner. With norethindrone and norgestrel forms, ovulation is suppressed in about half of cycles. With desogestrel and drospirenone forms, ovulation suppression is higher. The effect depends on regular use. After stopping, fertility usually returns quickly. The pill does not protect against STIs; a condom should be added.

Types and timing window

• Norethindrone or norgestrel: 3-hour window. If taken more than 3 hours late, it counts as missed. The mucus effect is established after 48 hours of regular use.
• Desogestrel (75 mcg): 12-hour window. More flexible. Suppresses ovulation more strongly.
• Drospirenone: 24-hour window. 24 active + 4 placebo regimen. Has an antimineralocorticoid effect; potassium monitoring may be needed.

At SoftCare, the type of pill is chosen based on how well it fits the patient’s routine. For patients who often forget, desogestrel or drospirenone is preferred. Those using norethindrone are advised to set an alarm.

Who it is suitable for

• Breastfeeding women
• Those who cannot use estrogen (migraine with aura, history of thrombosis, smokers over 35)
• Those who had side effects on the combined pill
• Those who want to protect their milk supply while breastfeeding
• Those who want to start early after giving birth

Contraindications:

• Active breast cancer
• Unexplained vaginal bleeding
• Severe liver disease
• Known thrombosis (caution with some forms)
• For drospirenone, hyperkalemia or kidney failure

In the CDC US MEC 2024, progestin-only pills are category 1 or 2 in many situations. They have fewer contraindications than the combined pill.

When to start

• Can be started on any day of the cycle, as long as pregnancy is ruled out.
• If started within the first 5 days of your period, it is effective immediately.
• At other times, condoms are used for the first 48 hours (norethindrone) or 7 days (other forms).
• While breastfeeding, it can be started 3–6 weeks after giving birth; it does not affect milk supply.
• Can be started the same day after a miscarriage or abortion.

Before starting, we ask about your blood pressure and list of medicines. If drospirenone is to be started, your potassium level may be checked. Changes in bleeding during the first 3 months are explained.

Managing missed pills

Norethindrone or norgestrel (3-hour window):

• If taken more than 3 hours late, it counts as missed.
• Take it as soon as you remember.
• Take the next pill at the usual time.
• Use condoms for the next 48 hours.
• If you had sex in the last 5 days, emergency contraception is considered.

Desogestrel (12-hour window):

• If taken more than 12 hours late, it counts as missed.
• Take it as soon as you remember.
• Use condoms for the next 48 hours.

Drospirenone (24-hour window):

• If taken more than 24 hours late, it counts as missed.
• Take it as soon as you remember.
• Use condoms for the next 7 days.

If you vomit or have diarrhea (within 3 hours of taking the pill), take an extra pill the same day and use condoms for 48 hours. At SoftCare, written instructions for missed pills are provided.

Changes in bleeding

The most common side effect is a change in bleeding pattern. Possibilities:

• Irregular spotting
• Frequent bleeding
• Infrequent bleeding
• Amenorrhea

It is hard to predict in advance. It is more noticeable in the first 3–6 months. In many women it decreases over time. If the bleeding is bothersome, short-term treatment or changing the pill can be discussed. With heavy or ongoing bleeding, pregnancy, infection and cervical disease are ruled out. Amenorrhea does not mean pregnancy; if in doubt, a test is done.

Side effects

Common:

• Irregular bleeding
• Headache
• Acne
• Breast tenderness
• Mood changes
• Ovarian cysts (most resolve on their own)

Rare risks:

• Thrombosis (much lower than with the combined pill)
• Ectopic pregnancy (absolute risk is low)
• Effects on the liver (rare)

If you have chest pain, shortness of breath, leg swelling or a sudden headache, stop the pill and seek urgent care. Those taking drospirenone are monitored for signs of high potassium (muscle weakness, palpitations).

Breastfeeding

The progestin-only pill is preferred during breastfeeding. It does not affect milk supply or the baby’s development. It can be started 3–6 weeks after giving birth. Starting early does not reduce milk supply. At SoftCare, desogestrel or norethindrone is recommended for breastfeeding patients; drospirenone is assessed with regard to potassium.

How it differs from the gold IUD and other methods

At SoftCare, the gold IUD is our first choice. The progestin-only pill may be preferred in these situations:

• A breastfeeding patient who does not want an IUD
• A patient who cannot use estrogen and is happy to take a daily pill
• A short-term protection plan

The gold IUD is hormone-free and carries no risk of forgetting. The combined pill contains estrogen and has a higher thrombosis risk. The implant and hormonal IUD carry no risk of forgetting. The progestin-only pill is the most timing-sensitive method. It does not protect against STIs; a condom should be added. The decision is based on breastfeeding status, risk of forgetting and history of thrombosis.

Drug interactions

Some medicines can reduce the pill’s effectiveness:

• Rifampicin
• Some antiepileptics (carbamazepine, phenytoin)
• St John’s wort
• Some HIV medicines

For those taking these medicines, backup protection or LARC is preferred. At SoftCare, we ask about your list of medicines.

Follow-up

• Check for bleeding and side effects in the first 3 months
• Annual gynecological examination
• Pap smear and HPV screening continue as routine
• If pills are often missed, switching to LARC is discussed
• Potassium monitoring for those taking drospirenone

At SoftCare, patients starting the pill receive the timing window and missed-pill instructions in writing.

Our approach at SoftCare

At SoftCare Clinic, assessment for the progestin-only pill starts with your gynecological history, breastfeeding status and list of medicines. The gold IUD is our first recommendation; the mini pill is discussed with patients who are breastfeeding or cannot use estrogen. The type of pill (norethindrone, desogestrel, drospirenone) is chosen based on adherence and potassium status. The timing window is given in writing. A check-up is planned within the first 3 months. If pills are often missed, switching to LARC is discussed. If there is an STI risk, condoms and testing are recommended.

Appointments: +90 212 241 30 10 · softcareclinic.com

References

• 1. Centers for Disease Control and Prevention (CDC). U.S. Selected Practice Recommendations for Contraceptive Use, 2024 – Progestin-Only Pills.
• 2. Centers for Disease Control and Prevention (CDC). U.S. Medical Eligibility Criteria for Contraceptive Use, 2024.
• 3. NHS. The progestogen-only pill.
• 4. American College of Obstetricians and Gynecologists (ACOG). Progestin-Only Hormonal Birth Control: Pill and Injection.
• 5. UpToDate. Progestin-only pills.
• 6. Drugs and Lactation Database (LactMed). Desogestrel and Drospirenone.
• 7. T.C. Sağlık Bakanlığı. Gebeliği Önleyici Yöntemler.
• Note: Timing windows and missed-pill rules vary by type of pill. At SoftCare, the gold IUD is our first choice; the progestin-only pill is discussed with selected patients. This reference list is for information purposes.

A citation does not mean that SoftCare wrote that text.

Medically reviewed by Op. Dr. Şükrü Sanus, Obstetrician & Gynecologist · Last medical review: 2 October 2026