Welcome to HCM!
Thanks for posting your query. I am happy to address your questions. Guaifenesin
is thought to act as an expectorant by increasing the volume and reducing the viscosity of secretions in the trachea and bronchi. Thus, it may increase the efficiency of the cough
reflex and facilitate removal of the secretions. It is not known whether guaifenesin is distributed into breast milk. However, problems in humans have not been documented. N-acetylcysteine
decreases thickness of mucous secretions in lung and used as adjuvant therapy
for abnormal, viscid, or inspissated mucous secretions in lung conditions. In lactating women it has not been evaluated (but category B). It is nearly completely cleared 30 h after administration. Breast-feeding women may consider resuming breast-feeding 30 h after administration. Hope I have answered your query. If you have any further questions, I will be happy to help. Thanks