Choosing allergy medicine when you have asthma

An oral antihistamine may ease sneezing, itching and watery eyes. A nasal corticosteroid may be considered for persistent nasal blockage or inflammation. Neither is a substitute for an asthma reliever during sudden breathing symptoms or for a prescribed preventer used to control lower-airway inflammation.

A cough can arise from asthma, nasal drainage, infection or another cause. In people with asthma, increasing night cough, wheeze, breathlessness or chest tightness warrants attention to asthma control rather than simply adding a cough-and-allergy product.

Take your inhalers and a list of all medicines to the pharmacist or prescriber. Ask for a single-ingredient product where possible, check for duplicate antihistamines, and clarify whether drowsiness could affect driving or work. Keep taking prescribed asthma treatment unless the clinician changes it.

Record triggers and breathing changes, especially after dust exposure, animal contact or seasonal pollen. Review inhaler technique and make sure your reliever is accessible. Trigger reduction and correct use of both nasal and inhaled medicines can be more useful than repeatedly switching brands.

Use your written asthma action plan if breathing deteriorates. Get emergency help when severe breathlessness prevents a full sentence, the reliever gives little or short-lived benefit, the chest feels increasingly tight, the lips change to blue or grey, or alertness decreases. Throat or tongue swelling after exposure also requires emergency care.

Discuss whether your respiratory symptoms reflect nasal allergy, poorly controlled asthma or both. Ask which formulation has the fewest unnecessary ingredients, how to separate regular and as-needed treatments, and whether your asthma plan needs updating for allergen-triggered episodes.