The most critical period that ① pregnant woman uses drug is gravid before 3 initial months, right now fetal be in development to form period, suffer the attack of medicaments the most easily, if cause fetal deformation, miscarriage, accordingly, during this as far as possible need not any medicaments, if must be used,medicine should seek advice from the reoccupy after doctor balance advantages and disadvantages. When ② must use drug because of the illness, period of treatment shortens as far as possible, do not take for a long time. ③ even if gravid 3 months come before be born, also be used less as far as possible or need not medicaments, when must be being used, choose via clinical and long-term applying safe medicaments as far as possible.

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