Triphasil is intended to prevent pregnancy when you have experienced known or suspected contraceptive failure (e.g., broken condom) or have not used contraception. The first dose of Triphasil should be taken as soon as possible but within 72 hours of unprotected sex. Triphasil is meant for emergency use only and not as a regular method of birth control. Like all oral contraceptives, Triphasil does not protect against infection with HIV (the virus which causes AIDS) and other sexually transmitted diseases.
Triphasil (ethinyl estradiol, levonorgestrel) is indicated for the prevention of pregnancy in women after known or suspected contraceptive failure or unprotected intercourse. To obtain optimal efficacy, use of these pills should begin as soon as possible but within 72 hours of intercourse.
If one hundred women used Triphasil correctly in one month, about two women would become pregnant after a single act of intercourse. If no contraception is used about eight women would become pregnant after a single act of intercourse. Therefore, the use of Triphasil results in a 75% reduction in the number of pregnancies to be expected if no ECPs were used after unprotected intercourse. Notably, some Triphasil clinical trials have shown that efficacy was greatest when ECPs were taken within 24 hours of unprotected intercourse, decreasing somewhat during each subsequent 24-hour period.
Triphasil acts primarily by inhibiting ovulation. Triphasil may also act by altering tubal transport of sperm and/or ova (thereby inhibiting fertilization), and/or possibly altering the endometrium (thereby inhibiting implantation).
This is why Triphasil will not work if you are already pregnant.
The Preven Emergency Contraceptive Kit contains a pregnancy test. This test can be used to verify an existing pregnancy resulting from intercourse that occurred earlier in the current menstrual cycle or the previous cycle. If a positive pregnancy result is obtained, the patient should not take the pills in the Preven Kit.
The initial two Triphasil pills must be taken as soon as possible but within 72 hours of unprotected intercourse. This is followed by the second dose of two pills 12 hours later. The patient should be instructed that if she vomits within one hour of taking either dose of the medication, she should contact her healthcare professional to discuss whether to repeat that Triphasil dose or to take an antinausea medication. ECPs are not indicated for ongoing pregnancy protection and should not be used as a woman's routine form of contraception.
Each Triphasil pill contains 0.25 mg levonorgestrel and 0.05 mg ethinyl estradiol. The pills are marked with a G on one side and the numerals 891 on the other.
There have been no reports of serious ill effects from Triphasil overdosage, including ingestion by children.
Triphasil is not effective if the woman is pregnant; it acts primarily by inhibiting ovulation. It may also act by altering tubal transport of sperm and/or ova (thereby inhibiting fertilization), and/or possibly altering the endometrium (thereby inhibiting implantation).
Ethinyl estradiol; levonorgestrel are combination oral contraceptive (COC) pills - Triphasil. The following are the known contraindications of daily cyclical combination oral contraceptive pill use (1 pill each day for 21 days of a 28-day cycle). It is not known whether these contraindications also apply to the ECP regimen of four oral contraceptive pills taken within a 12-hour period.
In addition, use is contraindicated in women who are known to be hypersensitive to any component of this product.
If you are breast-feeding, you should not take Triphasil. COCs have been reported in the milk of breast feeding mothers with no apparent clinical significance; long-term follow-up of children whose mothers used COCs while breast-feeding has shown no deleterious effects.
Store Triphasil at 25°C (77°F); excursions permitted to 15-30°C (59-86°F).