What is the recommended outpatient department (OPD) management for allergic rhinitis, chronic urticaria, and confirmed food or drug allergy?

Outpatient Management of Allergic Conditions

For allergic rhinitis affecting quality of life, start with intranasal corticosteroids as first-line monotherapy; for chronic urticaria, initiate second-generation antihistamines at standard doses and escalate to 4-times the standard dose if needed; for confirmed food or drug allergies, strict avoidance is mandatory with emergency epinephrine prescription.

Allergic Rhinitis Management

Initial Diagnosis

Make a clinical diagnosis when patients present with nasal congestion, runny nose, itchy nose, or sneezing, combined with findings of clear rhinorrhea, pale nasal mucosa, or red watery eyes 1. Do not routinely order imaging or extensive testing initially 1.

First-Line Pharmacotherapy

Intranasal corticosteroids (fluticasone, mometasone, budesonide, triamcinolone) are the most effective monotherapy and should be prescribed for patients whose symptoms affect quality of life 1, 2. This is a strong recommendation based on superior efficacy compared to all other single agents 2, 3.

For patients with predominant sneezing and itching, prescribe oral second-generation antihistamines (cetirizine, fexofenadine, desloratadine, loratadine) as these symptoms respond best to antihistamine therapy 1. Avoid first-generation antihistamines due to sedation and performance impairment 3.

Treatment Algorithm by Severity

• Mild intermittent symptoms (< 4 days/week or < 4 weeks/year): Second-generation oral antihistamine OR intranasal antihistamine (azelastine, olopatadine) 4

• Moderate-to-severe or persistent symptoms (> 4 days/week and > 4 weeks/year): Intranasal corticosteroid as monotherapy 2, 4

• Inadequate response to monotherapy: Add intranasal antihistamine to intranasal corticosteroid, particularly for moderate-to-severe disease 2

Important Caveats

Do NOT use oral leukotriene receptor antagonists (montelukast) as primary therapy - they are less effective than intranasal corticosteroids 1, 2.

Assess and document comorbidities including asthma, atopic dermatitis, sleep-disordered breathing, conjunctivitis, rhinosinusitis, and otitis media, as these frequently coexist 1.

When to Escalate Care

Perform or refer for specific IgE testing (skin or blood) when 1:

• Patients fail empiric treatment
• Diagnosis is uncertain
• Knowledge of specific allergen is needed for targeted therapy or immunotherapy

Offer or refer for immunotherapy (sublingual or subcutaneous) when patients have inadequate response to pharmacotherapy with or without environmental controls 1. This is the only disease-modifying treatment 2.

Chronic Urticaria Management

Stepwise Treatment Approach

Step 1: Second-generation antihistamines at standard dose (cetirizine 10mg, fexofenadine 180mg, desloratadine 5mg, loratadine 10mg daily) 5, 6

Step 2: If inadequate control after 2-4 weeks, increase antihistamine dose up to 4-times the standard dose (e.g., cetirizine 40mg daily) 5, 6. This is critical - most patients require higher than standard dosing.

Step 3: If symptoms persist despite high-dose antihistamines, add omalizumab 300mg subcutaneously monthly - effective in 70% of antihistamine-refractory patients 5

Step 4: For omalizumab failures, cyclosporine 3-5 mg/kg/day is effective in 65-70% but requires monitoring of blood pressure and renal function 5, 6

Critical Management Points

Avoid chronic corticosteroid use - only use short 3-10 day courses for severe exacerbations due to cumulative toxicity 5, 7. This is a common pitfall.

H2-blockers and leukotriene antagonists are no longer recommended as they add minimal benefit 5.

For chronic urticaria lasting > 6 weeks, consider referral to allergist/immunologist for evaluation of autoimmune causes and optimization of therapy 8, 7.

Food and Drug Allergy Management

Confirmed Food Allergy

Strict avoidance of the identified allergen is the only effective management 3.

Prescribe epinephrine auto-injector (EpiPen, Auvi-Q) for all patients with confirmed IgE-mediated food allergy due to anaphylaxis risk. Provide clear instructions on recognition of anaphylaxis and proper use.

Refer to allergist/immunologist for 3, 8:

• Confirmation of diagnosis via skin testing or specific IgE
• Education on allergen avoidance and cross-reactivity
• Development of emergency action plan
• Consideration of oral immunotherapy (for select foods)

Confirmed Drug Allergy

Document the specific drug, reaction type, and timing in the medical record to prevent future exposures.

Provide written list of medications to avoid, including cross-reactive agents (e.g., all penicillins if penicillin-allergic).

Refer to allergist/immunologist when 3, 8:

• Drug is essential and no alternatives exist (for desensitization)
• Diagnosis needs confirmation (many reported "allergies" are not true IgE-mediated)
• Reaction was severe (anaphylaxis, Stevens-Johnson syndrome)

Environmental Control Measures

For identified allergens, advise 1, 3:

• Pet removal for animal dander sensitivity (takes 20+ weeks for allergen levels to decrease)
• Integrated pest management for cockroach allergy (kitchen focus, gel baits, sealing food sources)
• Dust mite control (mattress/pillow covers, HEPA filtration, acaricides) for dust mite sensitivity
• Avoid irritants (tobacco smoke, strong perfumes, chlorine) which worsen all allergic conditions