Can i take advil cold and sinus while breastfeeding? is there another side effect on baby except the reduction of breast milk?

Advil cold and sinus contains phenylephrine, a nasal decongestant. This is preferred medication over anti-histamines like Claritin and Sudafed. Theoretically they can decrease milk supply, but no data exists in humans. Best alternatives for congestion symptoms are using a humidifier or nasal irrigation. Please reference these websites for future use: Drugs.com and mothertobaby.org