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Drug-Induced Birth Defects

Drugs can usually act on the fetus during three main stages of development:

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Fertilization and Implantation: From the time of conception to 17 days. The growing embryo is not susceptible to the teratogen in the first 2 weeks of pregnancy. The effect usually manifests itself as failure of pregnancy that often goes unnoticed in most of the cases. 

Embryonic period: 18 days to 55 days of gestation. It is the most vulnerable period and severe deformities are produced as cellular division and organogenesis takes place in this phase. 

Fetal period: From 56 days to time of delivery. It leads to severe growth and functional abnormalities. 


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Related Links
Genetic Defects
Metabolic Defects
Birth Defects - Infections 
Multifactorial Birth Defects
Environmental Birth Defects 
Birth Defects - Structural Defects
Birth Defects-Introduction 

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