Continuous Versus Cyclic Use of Oral Contraceptive Pills in Adolescents

The Hospital for Sick Children

Status and phase: Unknown; Phase 3

Conditions: Contraception

Treatments: Drug: Desogestrel-Ethinyl Estradiol 21 tablets; Drug: Desogestrel-Ethinyl Estradiol 28 tablets

Study type: Interventional

Funder types: Other

Identifiers

NCT00326404

1000008437

Details and patient eligibility

About

The primary purpose of this study is to compare the compliance rates of adolescents who take oral contraceptives (OCPs) continuously to those who take OCPs cyclically.

Full description

Oral contraceptive pills have traditionally been prescribed in a cyclical manner, where there are 21-24 days of active pills and 4-7 days of placebo pills or a pill-free interval, creating a 28-day cycle. It has now been proven that as long as a woman has both estrogen and progesterone, her uterine lining is protected and is thin. To that effect, a new OCP (Seasonale®, Barr Laboratories, Pomona, NY) has been packaged in the United States that combines 84 days of active pills with 7 days of placebo pills. This allows a withdrawal bleed every 3 months.

Like in adult women, OCPs are the most popular form of birth control and cycle control in adolescents. But, for a variety of reasons, adolescents tend to have poorer compliance when taking OCPs. Adult women tend to be noncompliant about 6% of the time, but, by the end of one year, adolescents have a non-compliance rate of 34-66%.

There have been few studies that even describe improved compliance and decreased ovarian follicular development in women who take OCPs continuously, which could be beneficial in decreasing the rate of adolescent pregnancy. The majority of the studies looking at continuous use of OCPs have been performed in adult women. At present, there has been only one article that has addressed the use of continuous OCPs in adolescents. Sucato and Gold discussed the indications of continuous use of OCPs, how to prescribe them, and what type of progestin to use; but they did not specifically examine compliance or the safety and efficacy of continuous OCPs in adolescents. We plan to evaluate these issues in our study.

Enrollment: 130 estimated patients

Sex: Female

Ages: 15 to 18 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Female
• Age 15 to 18
• Presenting to the Gynecology and Adolescent Medicine Clinic for contraception

Exclusion criteria

• Prior use of the study medication with no improvement in symptoms
• Any medical condition that indicates continuous OCPs (i.e. acute menorrhagia, dysmenorrhea that did not previously respond to cyclical OCP use)
• Personal history of or current thromboembolic disorder
• First-degree relative(s) with thromboembolic disorder
• Cerebrovascular disease
• Coronary artery disease
• Cardiac valvular disease
• Hypertension (systolic blood pressure > 160 mmHg or diastolic > 100 mmHG)
• Diabetes with retinopathy/neuromyopathy/nephropathy)
• Breast cancer
• Endometrial cancer
• Undiagnosed abnormal uterine bleeding
• Cholestatic jaundice of pregnancy
• Hepatic tumor
• Known or suspected pregnancy
• Less than 6 months postpartum if breastfeeding
• Classic migraine with aura or any other neurological signs
• Gallbladder disease
• Taking any medications known to affect the efficacy of OCPs (i.e. phenytoin, phenobarbital, primidone, carbamazepine, griseofulvin, rifampin)

Trial design

Primary purpose: Prevention

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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130 participants in 2 patient groups

1

Experimental group

Treatment:

Drug: Desogestrel-Ethinyl Estradiol 21 tablets

2

Active Comparator group

Treatment:

Drug: Desogestrel-Ethinyl Estradiol 28 tablets