What Is Larin 24 Fe 1/20? Uses, Dosage, and What You Need to Know in 2026

Larin 24 Fe 1/20 is a prescription combination oral contraceptive — a birth control pill — that contains two hormones: norethindrone acetate (a progestin) and ethinyl estradiol (an estrogen). It's manufactured by Northstar Rx LLC and is one of many generics in the norethindrone/estradiol family of birth control pills. Here's everything you need to know about it in 2026.

What Is Larin 24 Fe 1/20 Used For?

Larin 24 Fe 1/20 is FDA-approved for one primary indication: prevention of pregnancy in women of childbearing age. It is not a morning-after pill and will not terminate an existing pregnancy.

Some related norethindrone/EE formulations are also FDA-approved for treatment of moderate acne in women who also want oral contraception for at least six months. Check with your prescriber whether Larin 24 Fe specifically carries this indication or whether a different formulation would be more appropriate for acne management.

What Does the 24 Fe and 1/20 Mean?

The name tells you a lot about this medication:

"24" = 24 active hormone tablets per 28-day pack (compared to older pills with 21 active tablets)

"Fe" = ferrous fumarate (iron) in the 4 placebo tablets — included to maintain pill-taking habits but serving no therapeutic contraceptive purpose

"1/20" = 1 mg norethindrone acetate + 20 mcg ethinyl estradiol per active tablet — a low-dose formulation

The 24-day active schedule was developed to shorten the hormone-free interval from 7 days (traditional 21+7 packs) to just 4 days. This reduces estrogen withdrawal effects during the inactive pill days and typically results in a lighter, shorter withdrawal bleed.

How Effective Is Larin 24 Fe 1/20?

In clinical trials, the Pearl Index for Larin 24 Fe was 1.82 per 100 woman-years (95% CI 0.59–4.25) — meaning approximately 1.82 pregnancies per 100 women per year of use under study conditions. With perfect use, combination oral contraceptives are over 99% effective. With typical use (accounting for real-world missed pills), effectiveness is approximately 93%.

How to Take Larin 24 Fe 1/20 Correctly

Take one tablet daily at the same time each day. Consistency within a 24-hour window is critical.

You can take it with or without food. Taking it with food or at bedtime may reduce nausea.

Start timing: You can start with a Day 1 start (first day of your period) or a Sunday start. With Sunday start, use backup contraception for the first 7 days.

If you vomit or have severe diarrhea within 3–4 hours of taking your pill, treat it as a missed pill.

Missing pills reduces effectiveness. Follow the instructions in your pill pack for how to handle missed doses.

Who Should NOT Use Larin 24 Fe 1/20?

Larin 24 Fe is contraindicated for:

Women over 35 who smoke (boxed warning)

Women with high risk of arterial or venous thrombotic diseases (history of DVT, PE, stroke, MI)

Women with uncontrolled hypertension

Women with liver tumors or active liver disease

Women who are pregnant

Women taking hepatitis C drug regimens containing ombitasvir/paritaprevir/ritonavir

Women with migraines with aura (associated with increased stroke risk)

Is Larin 24 Fe a Controlled Substance?

No. Larin 24 Fe 1/20 is not a DEA-controlled substance. It can be prescribed via telehealth, refilled up to a 90-day supply, and transferred between pharmacies without the restrictions that apply to Schedule II–V medications.

What Makes Larin 24 Fe Different From Other Birth Control Pills?

The key differentiator is the 24+4 regimen. Traditional birth control pills (like Larin Fe 1/20 without the "24") have 21 active and 7 placebo tablets. The extended active hormone period of Larin 24 Fe reduces the hormone drop during inactive days, which can mean fewer hormone-related symptoms (like headaches or cramps) during the placebo week, and typically a lighter, shorter period.

Want a deeper dive into how Larin 24 Fe works? See: How Does Larin 24 Fe Work? Mechanism of Action Explained. If you need help finding it in stock, medfinder can help locate it at nearby pharmacies.