Myzilra
MYZILRA- levonorgestrel and ethinyl estradiol
Central Texas Community Health Centers
DESCRIPTION
Myzilra® (levonorgestrel and ethinyl estradiol tablets USP)—TRIPHASIC REGIMEN
Rx only
Patients should be counseled that this product does not protect against HIV infection (AIDS) and other sexually transmitted diseases.CLINICAL PHARMACOLOGY
Combination oral contraceptives primarily act by suppression of gonadotropins. Although the primary mechanism of this action is inhibition of ovulation, other alterations include changes in the cervical mucus (which increase the difficulty of sperm entry into the uterus) and the endometrium (which reduce the likelihood of implantation).
INDICATIONS AND USAGE
Oral contraceptives are indicated for the prevention of pregnancy in women who elect to use Myzilra® Tablets as a method of contraception. Oral contraceptives are highly effective. TABLE I 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 the IUD, depends upon the reliability with which they are used. Correct and consistent use of methods can result in lower failure rates.
| ||
| Method | Perfect Use | Typical Use |
| Levonorgestrel implants | 0.05 | 0.05 |
| Male sterilization | 0.1 | 0.15 |
| Female sterilization | 0.5 | 0.5 |
| Injectable progestogen | 0.3 | 0.3 |
| Oral contraceptives | 5 | |
| Combined | 0.1 | NA |
| Progestin only | 0.5 | NA |
| IUD | ||
| Progesterone | 1.5 | 2.0 |
| Copper T 380A | 0.6 | 0.8 |
| Condom (male) without spermicide | 3 | 14 |
| (Female) without spermicide | 5 | 21 |
| Cervical cap | ||
| Nulliparous women | 9 | 20 |
| Parous women | 26 | 40 |
| Vaginal sponge | ||
| Nulliparous women | 9 | 20 |
| Parous women | 20 | 40 |
| Diaphragm with spermicidal cream or jelly | 6 | 20 |
| Spermicides alone (foam, creams, jellies,and vaginal suppositories) | 6 | 26 |
| Periodic abstinence (all methods) | 1 to 9* | 25 |
| Withdrawal | 4 | 19 |
| No contraception (planned pregnancy) | 85 | 85 |
| NA — not available | ||
Adapted from Hatcher RA et al, Contraceptive Technology: 17th Revised Edition. NY, NY: Ardent Media, Inc., 1998.
CONTRAINDICATIONS
Oral contraceptives should not be used in women with any of the following conditions:
Thrombophlebitis or thromboembolic disorders.
A past history of deep-vein thrombophlebitis or thromboembolic disorders.
Cerebral-vascular or coronary-artery disease.
Known or suspected carcinoma of the breast.
Carcinoma of the endometrium or other known or suspected estrogen-dependent neoplasia.
Undiagnosed abnormal genital bleeding.
Cholestatic jaundice of pregnancy or jaundice with prior pill use.
Hepatic adenomas or carcinomas.
WARNINGS
Cigarette smoking increases the risk of serious cardiovascular side effects 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 should be strongly advised not to smoke.
The use of oral contraceptives is associated with increased risks of several serious conditions including myocardial infarction, thromboembolism, stroke, hepatic neoplasia, gallbladder disease, and hypertension, although the risk of serious morbidity or mortality is very small in healthy women without underlying risk factors. The risk of morbidity and mortality increases significantly in the presence of other underlying risk factors such as hypertension, hyperlipidemias, obesity, and diabetes.
Practitioners prescribing oral contraceptives should be familiar with the following information relating to these risks.
The information contained in this package insert is based principally on studies carried out in patients who used oral contraceptives with higher formulations of estrogens and progestogens than those in common use today. The effect of long-term use of the oral contraceptives with lower formulations of both estrogens and progestogens remains to be determined.
Throughout this labeling, epidemiological studies reported are of two types: retrospective or case control studies and prospective or cohort studies. Case control studies provide a measure of the relative risk of disease, namely, a ratio of the incidence of a disease among oral-contraceptive users to that among nonusers. The relative risk does not provide information on the actual clinical occurrence of a disease. Cohort studies provide a measure of attributable risk, which is the difference in the incidence of disease between oral-contraceptive users and nonusers. The attributable risk does provide information about the actual occurrence of a disease in the population. For further information, the reader is referred to a text on epidemiological methods.
1. Thromboembolic Disorders and Other Vascular Problems
a. Myocardial Infarction
An increased risk of myocardial infarction has been attributed to oral-contraceptive use. This risk is primarily in smokers or women with other underlying risk factors for coronary-artery disease such as hypertension, hypercholesterolemia, morbid obesity, and diabetes. The relative risk of heart attack for current oral-contraceptive users has been estimated to be two to six. The risk is very low under the age of 30.
Smoking in combination with oral-contraceptive use has been shown to contribute substantially to the incidence of myocardial infarctions in women in their mid-thirties or older with smoking accounting for the majority of excess cases. Mortality rates associated with circulatory disease have been shown to increase substantially in smokers over the age of 35 and nonsmokers over the age of 40 (TABLE II) among women who use oral contraceptives.
Oral contraceptives may compound the effects of well-known risk factors, such as hypertension, diabetes, hyperlipidemias, age, and obesity. In particular, some progestogens are known to decrease HDL cholesterol and cause glucose intolerance, while estrogens may create a state of hyperinsulinism. Oral contraceptives have been shown to increase blood pressure among users (see section 9 in WARNINGS). Similar effects on risk factors have been associated with an increased risk of heart disease. Oral contraceptives must be used with caution in women with cardiovascular disease risk factors.
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