Allergic Rhinitis and Oral Decongestant and Antihistamine Combinations
Decongestants help to narrow the blood vessels, which results in a clearing of nasal congestion. Antihistamines help stop or reduce the production of histamine, a chemical that is released when the immune system reacts to an allergen.
Possible side effects of the oral decongestant/antihistamine combinations include:
- Increase in blood pressure
- Nervousness, difficulty sleeping
- Rapid heart rate