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What is Plan B®?Plan B® is the emergency contraceptive pill, most trusted by Canadian women†and their healthcare providers.Plan B® contains 1.5 mg of levonorgestrel—an ingredient that is also commonly found in birth control pills.How does Plan B® work?Plan B works by temporarily delaying the release of an egg from the ovary, so there’s no egg to meet the sperm.No egg, no fertilization, no pregnancy.