Every medication -- whether it's over-the-counter or available by prescription -- is categorized as safe (or unsafe) for use in pregnancy. You name the drug and it has a listing of A, B, C, D or X attached to it.
"The only 'A' drugs are prenatal vitamins and thyroid medication," says Daniel Roshan, M.D., assistant professor of ob-gyn at NYU School of Medicine in New York City. "Nothing else is 100 percent safe. Even Tylenol is considered a 'B.' " Here's more on these designations:
A: Considered very safe.
B: Considered safe in animal studies but there are no human studies.
C: Adverse effects in animal studies but there are no human studies.
D: Can cause birth defects.
X: Should never be used.