The new Sno is levonorgestrel drops, and Yutin is levonorgestrel tablets. Both drugs belong to the emergency contraceptive pill, and the main active ingredients of both are the same, only the dosage form is different. Due to the different dosage forms, the process of absorption and utilization as well as clinical effects are also different. The clinical effect (emergency contraceptive effect) of Synthroid levonorgestrel drops is better than that of Yutin levonorgestrel tablets. However, its specific contraceptive effect is not exactly the same among different individuals, and is affected by various factors such as whether or not to take the pill in time, whether or not to take other drugs at the same time, and whether or not to smoke and drink alcohol. In principle, neither the Synthroid Levonorgestrel Pills nor the Yutin Levonorgestrel Tablets should be taken frequently or often.