Medically reviewed by Drugs.com. Last updated on Mar 4, 2022.
Sronyx® (Levonorgestrel and Ethinyl Estradiol Tablets USP)
To achieve maximum contraceptive effectiveness, Sronyx must be taken exactly as directed at intervals not exceeding 24-hours.
Sronyx is a monophasic preparation plus 7 inert tablets. The dosage of Sronyx is one tablet daily for 21 consecutive days per menstrual cycle plus 7 peach inert tablets according to the prescribed schedule. It is recommended that Sronyx be taken at the same time each day, preferably after the evening meal or at bedtime. During the first cycle of medication, the patient should be instructed to take one white Sronyx tablet daily and then 7 peach inert tablets for twenty-eight (28) consecutive days, beginning on day one (1) of her menstrual cycle. (The first day of menstruation is day one.) Withdrawal bleeding usually occurs within 3 days following the last white tablet. (If Sronyx is first taken later than the first day of the first menstrual cycle of medication or postpartum, contraceptive reliance should not be placed on Sronyx until after the first 7 consecutive days of administration. The possibility of ovulation and conception prior to initiation of medication should be considered.)
When switching from another oral contraceptive, Sronyx should be started on the first day of bleeding following the last active tablet taken of the previous oral contraceptive. The patient begins her next and all subsequent 28-day courses of Sronyx on the same day of the week that she began her first course, following the same schedule. She begins taking her white tablets on the next day after ingestion of the last peach tablet, regardless of whether or not a menstrual period has occurred or is still in progress.
Anytime a subsequent cycle of Sronyx is started later than the next day, the patient should be protected by another means of contraception until she has taken a tablet daily for seven consecutive days.
If spotting or breakthrough bleeding occurs, the patient is instructed to continue on the same regimen. This type of bleeding is usually transient and without significance, however, if the bleeding is persistent or prolonged, the patient is advised to consult her physician. Although the occurrence of pregnancy is highly unlikely if Sronyx is taken according to directions, if withdrawal bleeding does not occur, the possibility of pregnancy must be considered. If the patient has not adhered to the prescribed schedule (missed one or more active tablets or started taking them on a day later than she should have), the probability of pregnancy should be considered at the time of the first missed period and appropriate diagnostic measures taken before the medication is resumed. If the patient has adhered to the prescribed regimen and misses two consecutive periods, pregnancy should be ruled out before continuing the contraceptive regimen.
The risk of pregnancy increases with each active (white) tablet missed. For additional patient instructions regarding missed pills, see the "WHAT TO DO IF YOU MISS PILLS" section in the DETAILED PATIENT LABELING below. If breakthrough bleeding occurs following missed tablets, it will usually be transient and of no consequence. If the patient misses one or more peach tablets, she is still protected against pregnancy provided she begins taking white tablets again on the proper day.
In the nonlactating mother, Sronyx may be initiated postpartum, for contraception. When the tablets are administered in the postpartum period, the increased risk of thromboembolic disease associated with the postpartum period must be considered. (See "CONTRAINDICATIONS," "WARNINGS," and PRECAUTIONS" concerning thromboembolic disease.) It is to be noted that early resumption of ovulation may occur if bromocriptine mesylate has been used for the prevention of lactation.
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