The National Women's Health Information Center lists these common causes of urinary tract infections in women: 1  Wiping from back to front after a bowel movement. 2  Having sex. 3  Holding urine for too long.  Being 1  diabetic. Having a kidney stone or other factor that makes it difficult to urinate.  Producing less estrogen, such as after menopause.
However, the estrogen hormones in Premarin Vaginal Cream may decrease the production and quality of breast milk. It is for this reason that estrogen-containing medications (including Premarin Vaginal Cream and many birth control pills) are not usually recommended for women who are breastfeeding.
Pseudoephedrine and phenylephrine can both affect pregnancy and breastfeeding. These drugs are category C drugs, which means thereâs the possibility of birth defects. Women should avoid using them during the first trimester of pregnancy and possibly throughout pregnancy. These drugs also pass into a womanâs breast milk, though phenylephrine does so in smaller amounts. That means these drugs may have side effects in a child who is breastfed by someone who takes these drugs.