A drug may be classified by the chemical type of the active ingredient or by the way it is used to treat a particular condition. Each drug can be classified into one or more drug classes.
Ophthalmic antihistamines and decongestants are products designed especially so that it can be applied in the eyes to treat hay fever symptoms such as runny eyes and redness.
Antihistamines block the histamine receptors and inhibit the action of histamine, which when activated cause runny eyes, redness, itching and so on. Decongestants are sympathomimetic drugs that relieve redness in the eyes.
Drugs.com provides accurate and independent information on more than 24,000 prescription drugs, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment.
Data sources include Micromedex™ (updated Dec 30th, 2013), Cerner Multum™ (updated Jan 17th, 2014), Wolters Kluwer™ (updated Mar 2nd, 2014) and others. To view content sources and attributions, refer to our editorial policy.