Allergy drops, explained.

Allergy drops are a form of sublingual immunotherapy (SLIT): a liquid extract of the allergens you react to, held under the tongue once a day. Repeated small doses retrain the immune system to tolerate those allergens, which can reduce symptoms and the need for medication over time. Allergen immunotherapy is the only disease-modifying treatment for allergies; antihistamines and sprays help you feel better today but do not change the underlying allergy.

Sublingual immunotherapy as a whole has strong evidence: a Cochrane review of 60 randomized trials (Radulovic 2010) and a JAMA review of 63 trials (Lin 2013) found it reduces allergic rhinitis symptoms and medication use compared with placebo. Most of those trials tested standardized single-allergen products. The evidence for personalized drops that mix several allergens is more limited and mostly observational, including Curex’s own 2,897-patient cohort published in Frontiers in Allergy in 2026 (PMID 42358593).

A small number of SLIT tablets are FDA-approved for specific allergens (grass, ragweed and house dust mite). Personalized allergy drops are compounded by pharmacies and prescribed off-label, a long-standing, legitimate practice. The drops are made from FDA-approved allergenic extracts, the same extracts used in allergy shots. Off-label does not mean unsafe or experimental.

All three are allergen immunotherapy. Shots (SCIT) are injections given in a clinic, with a 30-minute observation after each dose. Tablets are FDA-approved sublingual products that each treat one allergen group. Drops are compounded liquid extracts that can combine several allergens in one prescription and are taken at home. Both drops and shots are effective and generally safe; they fit different patients.

Many people notice improvement within the first few months or the first allergy season. A full course usually lasts 3 to 5 years, and the benefit can persist after treatment stops. Immunotherapy is a long-term commitment, not a quick fix.

Most side effects are mild and local: an itchy mouth or throat, mild swelling under the tongue, or an upset stomach, usually in the first weeks. Systemic reactions are uncommon (about 1.1% of patients in a 2024 meta-analysis, Janz et al.) and usually mild; anaphylaxis is rare. Sublingual immunotherapy is generally safe under clinical supervision. Throat tightness or trouble breathing needs emergency care.

Anyone with a history of anaphylaxis, severe or uncontrolled asthma, a food or drug allergy, a young child, and anyone who is pregnant should be evaluated in person before starting immunotherapy at home. People with eosinophilic esophagitis are generally not candidates for sublingual immunotherapy.

Insurance often covers testing, consultations and in-office allergy shots; compounded drops are generally out-of-pocket. Drops are usually HSA/FSA-eligible, and Curex offers financing on some treatment plans. Current Curex plans and prices are listed at getcurex.com/pricing.

You place the prescribed number of drops under the tongue, hold them there for one to two minutes, then swallow, once a day as directed by your prescriber. The dose usually starts low and is increased over the first weeks.

Curex allergy drops need no refrigeration. They are stable for 14 days at 80–100°F and for 48 hours above 100°F, so they can travel with you.

No treatment can promise that. Immunotherapy builds tolerance (desensitization) so symptoms become less intense, and for many people the improvement lasts after a full course. Results vary by person and allergen.

Children may be candidates for sublingual immunotherapy, and a daily dose at home can be easier for families than weekly injections. Young children should be evaluated by an allergist in person first.