Hi, Thanks for posting in HCM. I understand your concern. Levonelle pill is morning after pill (emergency contraceptive pill). It contains Levonorgestrel , which is a hormonal preparation. it needs to be taken within 72 hours of unprotected intercourse to prevent unwanted or accidental pregnancy. The pill would prevent pregnancy by causing breakthrough bleeding within 3 weeks from the day of its intake. It is rapidly and completely absorbed after oral administration (bioavailability about 100%). It is about 97 to 99% protein-bound. Levonorgestrel is conjugated to form sulfate conjugates and, to a lesser extent, glucuronide conjugates in plasma. About 45% of levonorgestrel and its metabolites are excreted in the urine and about 32% are excreted in feces, mostly as glucuronide conjugates. Its half-life is about 42 +/- 16 hours, which is dependent on body weight, body fat and length of treatment. Hope the information provided would be helpful. All the best.