How Do Transdermal Contraceptives Work?

Reviewed on 12/27/2021

How do transdermal contraceptives work?

Transdermal contraceptives are hormonal patches applied on the skin to prevent pregnancy from vaginal intercourse. Transdermal contraceptives work the same way as oral contraceptives do, however, the medication is delivered in measured doses every day by skin patches and is absorbed through the skin.

Transdermal contraceptives contain a combination of progestin and estrogen, synthetic forms of the natural female sex hormones progesterone and estrogen. Transdermal contraceptives work by interfering with a woman’s natural hormonal balance that enables ovulation, egg fertilization, implantation, and maintenance of pregnancy. 

The progestin and estrogen absorbed from transdermal contraceptives bind to progesterone and estrogen receptors, protein molecules in cells that respond to these hormones, and disrupt the hormonal balance to prevent pregnancy. Transdermal contraceptives work in the following ways:

How are transdermal contraceptives used?

Transdermal contraceptives are applied on the first day of menstruation on clean, dry skin on the abdomen, buttock, or upper torso excluding breasts. Each transdermal contraceptive patch is replaced with a new one after a week, for 3 consecutive weeks. A week’s gap is allowed before starting the next cycle, during which time menstruation will occur.

Transdermal contraceptives are approved by the FDA for contraception in females of reproductive potential with a body mass index (BMI) of less than 30 gm/sqm, for whom a combined hormonal contraceptive is appropriate.

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What are side effects of transdermal contraceptives?

Side effects of transdermal contraceptives may include the following:

Information contained herein is not intended to cover all possible side effects, precautions, warnings, drug interactions, allergic reactions, or adverse effects. Check with your doctor or pharmacist to make sure these drugs do not cause any harm when you take them along with travel medicines. Never stop taking your medication and never change your dose or frequency without consulting your doctor.

What are names of transdermal contraceptive patches?

Generic and brand names of transdermal contraceptive patches include:

References
https://reference.medscape.com/drugs/contraceptives-transdermal

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