OTC Allergy Medications Guide

This article is part of our Skin Allergies resource center, covering all aspects of skin allergies diagnosis, treatment, and management.

Nonprescription allergy medicines are part of the broader allergy treatment toolkit. Understanding what each category does — and does not do — helps you choose appropriately and use medicines safely. If symptoms are not adequately controlled by OTC options, see prescription allergy treatments for additional options.

Second-Generation Oral Antihistamines

Second-generation antihistamines — including cetirizine, loratadine, and fexofenadine — block histamine H1 receptors throughout the body. They are highly effective for sneezing, itching, hives, and runny nose. Unlike older antihistamines, they are engineered to minimize penetration into the brain, which significantly reduces sedation. Cetirizine may cause mild drowsiness in some people; fexofenadine has the lowest sedation risk in this group. All three are generally considered safe for extended daily use in most healthy adults when taken as directed. See our detailed antihistamines comparison guide for a full breakdown.

Important limitations: Oral antihistamines provide only modest relief for nasal congestion. They do not address the underlying inflammatory process the way intranasal corticosteroids do.

First-Generation Antihistamines

Diphenhydramine (Benadryl) and chlorpheniramine are older antihistamines that readily cross into the brain, causing significant sedation, impaired coordination, and anticholinergic effects including dry mouth, urinary retention, and blurred vision. These effects are more pronounced and potentially more dangerous in older adults. First-generation antihistamines are not recommended for regular daily use. They should not be taken before driving or operating machinery. Because of their fast onset, they are sometimes used for acute hives or as a short-term sleep aid, but clinicians generally prefer second-generation options for allergy management.

Intranasal Corticosteroid Sprays

Several intranasal corticosteroid (INCS) sprays are now available without a prescription, including fluticasone propionate (Flonase), triamcinolone (Nasacort), and budesonide (Rhinocort). AAAAI and ACAAI guidelines recognize intranasal corticosteroids as the most effective monotherapy for allergic rhinitis, particularly for nasal congestion, postnasal drip, and sneezing. These medications suppress multiple inflammatory pathways beyond histamine, which is why they outperform antihistamines for congestion. Full effect may take several days of regular use — they are not for immediate relief. See the nasal spray treatment guide for administration technique and comparisons across spray types.

Important limitations: INCS sprays act locally in the nose and do not relieve eye symptoms, skin symptoms, or systemic reactions.

Antihistamine Nasal Sprays

Azelastine hydrochloride nasal spray (Astepro Allergy) is now available OTC and provides rapid relief — typically within 15 to 30 minutes — for sneezing, itching, and runny nose. It also has some effect on nasal congestion, which distinguishes it from oral antihistamines. A notable side effect is a bitter taste if the spray drains to the back of the throat. This can be minimized with proper spray technique.

Decongestants

Oral decongestants such as pseudoephedrine and phenylephrine reduce nasal congestion by constricting blood vessels in the nasal lining. Pseudoephedrine is sold behind the pharmacy counter in many states. Important cautions: decongestants can raise blood pressure and heart rate, cause insomnia and anxiety, and are not appropriate for people with hypertension, heart disease, hyperthyroidism, or those taking certain antidepressants. Consult a pharmacist or clinician before use if you have any of these conditions.

Topical nasal decongestant sprays (e.g., oxymetazoline/Afrin) provide fast, powerful congestion relief but should not be used for more than three consecutive days. Longer use leads to rebound congestion (rhinitis medicamentosa), which can be difficult to resolve.

Combination Products

Many products combine an antihistamine with a decongestant (e.g., loratadine + pseudoephedrine). Combination products can be effective for multi-symptom relief but require caution: decongestant-containing products carry all the cautions listed above. Additionally, taking a combination product alongside another product containing the same active ingredient — for example, a separate decongestant or a sleep aid containing diphenhydramine — risks unintentional double-dosing. Always read the full ingredient list before combining products.

Mast-Cell Stabilizer Nasal Sprays

Cromolyn sodium nasal spray is available OTC and works by preventing mast cells from releasing histamine and other inflammatory chemicals. It is most effective when started before allergen exposure and used consistently. It has an excellent safety profile and is sometimes considered for people who cannot tolerate other nasal spray options. Its main limitation is that it requires frequent daily dosing and takes days to weeks to reach full preventive effect.

Saline Sprays and Rinses

Isotonic and hypertonic saline sprays and nasal rinses (neti pots) mechanically flush allergens and irritants from the nasal passages, thin mucus, and support normal mucociliary clearance. They have no pharmacological side effects and can be used alongside other nasal medications. Rinse devices must be cleaned thoroughly after each use.

Allergy Eye Drops

OTC antihistamine eye drops (e.g., ketotifen) rapidly relieve ocular itching, redness, and tearing from allergic conjunctivitis. They are more targeted than oral antihistamines for eye symptoms. Ketotifen also has mast-cell stabilizing properties. Plain lubricant drops can provide temporary comfort but do not address the allergic mechanism.

Important Safety Considerations

• Pediatric use: Always check age indications. Many OTC allergy medicines have different dosing for children or are not recommended below a certain age. Do not estimate a child's dose without checking product labeling or consulting a clinician.
• Pregnancy and breastfeeding: Some OTC allergy medicines are used during pregnancy under clinician guidance; others are not recommended. Consult a clinician or pharmacist before use.
• Drug interactions: Antihistamines and decongestants can interact with other medicines including MAO inhibitors, blood pressure medicines, and certain antidepressants. Always review interactions with a pharmacist.
• Sedation and driving: First-generation antihistamines cause significant impairment. Even second-generation antihistamines can cause drowsiness in some individuals. Do not drive or operate heavy machinery until you know how a medicine affects you.
• Anaphylaxis: OTC antihistamines are not a substitute for an epinephrine auto-injector and must never be used as first-line treatment for anaphylaxis. If you have had a severe allergic reaction, speak with an allergist about whether a prescription epinephrine device is appropriate for you.

For symptoms not adequately controlled with these options, explore prescription allergy treatments with a clinician.