Is it normal that after the drug Erdomed coughs terribly?

Yes. Erdomed is a drug in the form of capsules intended for use in the treatment of diseases affecting the upper and lower respiratory tract. The preparation contains erdosteine, which thins the secretion in the bronchial tree and supports its derivation, so during the treatment the cough reflex should be more frequent and proceed with detachment of secretions. Please remember to maintain an adequate degree of hydration of the body during the course of treatment with the drug. At the following link you can examine the availability of the drug in pharmacies in the Polish cooperating with our system: https://www.gdziepolek.pl/produkty/27509/erdomed-kapsulki/apteki