Antihistamines and decongestants

• source: https://my-doc.com/upper-respiratory-infection/antihistamines-decongestants-stuffy-nose/

First-generation antihistamines have strong sedative action and would likely give you an unpleasant dry mouth after consumption. They are mostly used for allergic rhinitis and conjunctivitis, contact dermatitis, hay fever and even motion sickness. 

If your nasal congestion is keeping you awake, first-generation antihistamines may be a godsend for you. However, ensure that you do not take these before operating any machinery or driving.