How effective is plan B if the girl throws up an hour and a half after the last of 1st dose?

Plan B (levonorgestrel) is most effective when taken as soon as possible after unprotected intercourse, ideally within 72 hours. If a girl vomits within two hours of taking the pill, it may not be absorbed fully, and she should consider taking another dose. However, vomiting an hour and a half later does not significantly affect the effectiveness, as the pill is likely already absorbed. It's advisable to consult with a healthcare provider for personalized guidance.