Pregnancy

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Last Updated on Aug 18, 2016
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Drugs and Pregnancy

Fetus is most vulnerable to teratogenic drugs during the second and early third months of pregnancy as drugs can enter the fetal circulation.

Drugs taken during pregnancy can cause multiple effects they may lead to fetal defects or alter fetal function, they may reduce blood flow through the placenta thus resulting in an undernourished fetus and a low birth weight baby, or they may increase the contractions of the uterus leading to premature delivery.

The fetus is most vulnerable to teratogenic drugs during the second and early third months of pregnancy. During this time, organ formation takes place and drugs can cause miscarriage or structural abnormalities in the fetus. If the teratogenic drug is taken in the first month of pregnancy, either it has no effect on the pregnancy or it may cause a miscarriage that often goes unnoticed. Drugs taken later may alter growth and functions of different organs.

Ideally, all medication that are not necessary should be stopped few months before a woman plans her pregnancy. Medication should be taken during pregnancy only on a physician's advice. Doctors may prescribe drugs for common illnesses especially those related to pregnancy that are generally considered safe. Other drugs may be prescribed for more serious or life-threatening conditions when the beneficial effects justify their use. Some general rules that apply are as follows-

  • Newer drugs should be avoided.
  • Drugs should be used in the lowest possible dose.
  • Drugs should be taken for the shortest period possible.
  • Self-medication should be strictly avoided.
  • Avoid alcohol, smoking, illicit drugs.
  • Avoid procedures such as X-rays and CT scans.
  • Herbs and diet supplements should be taken with caution.

Some drugs are definitely dangerous to the mother or the fetus and should absolutely not be used; these are contraindicated in pregnancy.

References:

  1. Sachdeva S, Patel BG, Patel BK. Drug Use in Pregnancy: a point to ponder. Indian J Pharma Sci 2009; 71 (1): 1-7
  2. KD Tripathi. Essentials of Medical Pharmacology 6th Edition

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During pregnancy, it is wise to get opinion from the gynecologist before taking any medicine, even a cough syrup. However, one can try natural remedies and better lifestyle to reduce the pregnancy symptoms instead of opting for medication. Hope it helps.

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