TheraRadar

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Data updated: Mar 10, 2026

KELNOR 1/50

ETHINYL ESTRADIOL
Approved 1991-12-30
1
Indication
--
Phase 3 Trials
34
Years on Market

Details

Status
Prescription
First Approved
1991-12-30
Routes
ORAL-28
Dosage Forms
TABLET

Companies

KELNOR 1/50 Approval History

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What KELNOR 1/50 Treats

1 FDA approvals

Originally approved for its first indication in 1991 .

  • Other (1)

KELNOR 1/50 Boxed Warning

Cigarette smoking increases the risk of serious adverse effects on the heart and blood vessels from oral contraceptive use. This risk increases with age and with heavy smoking (15 or more cigarettes per day) and is quite marked in women over 35 years of age. Women who use oral contraceptives are strongly advised not to smoke....

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Key Completed Trials

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Completed studies with published results, ranked by significance

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Trial Timeline

Full development history with FDA approval milestones

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Understanding FDA Approval Types
Count Type What it means
- ORIG Original approval - drug first enters market
- SUPPL - Efficacy New indication (new disease/condition approved)
- SUPPL - Labeling Label text changes (warnings, dosing updates)
- SUPPL - Manufacturing Production changes (new facility)
- SUPPL - Chemistry Formulation changes (new dosage strength)

Green lines in the timeline show ORIG and Efficacy approvals - the clinically meaningful milestones.

KELNOR 1/50 FDA Label Details

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Indications & Usage

Kelnor 1/50 is indicated for the prevention of pregnancy in women who elect to use oral contraceptives as a method of contraception. Oral contraceptive products such as Kelnor 1/50, which contain 50 mcg of estrogen, should not be used unless medically indicated. Oral contraceptives are highly effective. Table 1 lists the typical accidental pregnancy rates for users of combination oral contraceptives and other methods of contraception. The efficacy of these contraceptive methods, except sterilization and progestogen implants and injections, depends upon the reliability with which they are used....

⚠️ BOXED WARNING

Cigarette smoking increases the risk of serious adverse effects on the heart and blood vessels from oral contraceptive use. This risk increases with age and with heavy smoking (15 or more cigarettes per day) and is quite marked in women over 35 years of age. Women who use oral contraceptives are str...

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Data Sources

Data sourced from official FDA and NIH databases. Click links to verify on original sources.