Tetracycline is a wide-spectrum antibiotic. During pregnancy it crosses into the placenta, and goes directly to the unborn child’s teeth. It may continue in affecting the teeth of the fetus causing yellow mottling and staining.
While the mother is taking the antibiotic, it can slow or stop the growth of bone in the unborn fetus. It should not be taken during pregnancy.
In general, aspirin or Ibuprofen are not recommended during pregnancy. Aspirin can interfere with the blood’s clotting action. Aspirin can also cause the premature closure of the vessel in the baby’s heart leading to high pressure (pulmonary hypertension).
If you have a headache, a few low-doses will not be detrimental. You should always ask your doctor first. If your headache persists, see your doctor.
If taking Aspirin in the days leading up to birthing Aspirin can cause some problems. It can produce difficulty in blood clotting in both the pregnant woman and the baby. It also can cause neonatal jaundice.
Kitzinger, Sheila. The Complete Book of Pregnancy and Childbirth. (1996) Alfred A. Knopf.
Lowdermilk, Deitra Leonard and Shannon E. Perry. Maternity and Women’s Health Care. 9th Ed. (2007) Mosby/elsevier