Antihistamines work fast and are good at treating mild symptoms of hay fever, such as sneezing and runny nose, whereas corticosteroid nasal sprays may take several days to work.

Most sinus problems are due to allergy, infection, or a foreign substance inhaled up the nose. Find out what products are available for sinus and nasal problems.

A major cause of eye problems is allergic, bacterial or viral conjunctivitis (inflammation of the 'wet' surfaces of the eye). Find out what products are available for conjunctivitis.