Acetaminophen, also known as paracetamol, Piriton and Benadryl, is best avoided by pregnant women throughout pregnancy. The drug is a metabolite of finasteride in the body, with little gastrointestinal irritation and a quicker effective concentration in the blood, the antipyretic and analgesic effect is slow and long-lasting, making it a safer antipyretic and analgesic. Its antipyretic effect is similar to that of aspirin, but the analgesic effect is weaker. This drug has no anti-inflammatory or anti-rheumatic effect and is suitable for cold and fever, neuralgia and migraine, etc. It is especially suitable for those who cannot tolerate or are allergic to aspirin. The side effects of this drug are damage to liver and kidney function with long-term use, occasional rash, drug rash, hemolytic anemia, leukopenia, etc. Although this drug does not cause fetal malformation when used after pregnancy and delivery, it may have some effect on the growth and development of the fetus, so it is not recommended for use during the entire pregnancy.