What FDA‑approved SLIT tablets cover (and what they require)

Sublingual immunotherapy (SLIT) tablets are FDA‑approved for a limited set of aeroallergens and are an at‑home, needle‑free alternative to in‑office allergy shots (SCIT) once you complete the first observed dose.

What they treat

Grass pollens: Timothy (and five‑grass mixes)
Short ragweed pollen
House dust mite (HDM)

Who they’re for

Indication: allergic rhinitis with/without conjunctivitis confirmed by positive allergy testing to the target allergen.
Age: typically 5–65 years; exact labeled ages vary by product. Start only if the labeled age range and clinical history fit. Wyndly SLIT overview

How they’re taken

First dose: given under medical supervision with ≥30 minutes of observation; prescribers typically co‑prescribe an epinephrine auto‑injector and train patients on use due to rare systemic reactions (a label requirement for SLIT tablets in the U.S.).
Daily at home thereafter. Grass/ragweed tablets are generally started prior to the season per label (common clinical practice: 8–12 weeks before peak); dust‑mite tablets are taken year‑round.

Safety

Anaphylaxis with SLIT is extremely rare; estimated risk for SLIT (drops/tablets) is on the order of 1 in 100 million doses; no deaths reported for SLIT drops. Wyndly anaphylaxis explainer, Wyndly safety overview

Evidence and guidance

Major reviews and U.S. specialty society guidance (e.g., AAO‑HNS) recognize SLIT as effective for long‑term symptom reduction. Wyndly immunotherapy summary

Physician‑directed multi‑allergen SLIT drops (off‑label, evidence‑based)

Custom SLIT drops use the same FDA‑approved extracts as shots but are formulated for oral use. In the U.S., multi‑allergen drops are used off‑label (tablets are the only FDA‑approved SLIT products). They allow simultaneous desensitization to multiple aeroallergens (e.g., grasses, weeds, trees, dust mites, pets) and are taken daily at home without injections. Wyndly SLIT overview

What to know

Evidence: Systematic reviews and practice guidelines support SLIT as effective and safe for environmental allergies. Wyndly immunotherapy
Safety profile: Lower severe‑reaction risk than shots; typical side effects are mild oral itching or throat irritation that resolve quickly. Wyndly safety
Onset/duration: Many patients notice improvement in 4–8 weeks; most within 4 weeks–6 months; full course ~3 years for durable benefit. Onset timeline
Coverage: Custom drops are typically not insurance‑covered in the U.S.; HSA/FSA usually eligible. Allergy‑shot alternative

Choosing among tablets, drops, and shots

Option	Allergens covered	Best fit	First‑dose supervision	Where you dose	Safety profile	Typical coverage	Onset of relief	Course length
FDA SLIT tablets	Single allergen per tablet (grass, ragweed, HDM)	Single‑dominant allergen; prefers Rx coverage	Yes (≥30 min observed)	Home (after first dose)	Very favorable; rare systemic reactions	Often pharmacy benefit	Weeks to a few months	Seasonal or year‑round per label; multi‑year
Custom SLIT drops (off‑label US)	Multi‑allergen (e.g., grasses + weeds + trees + HDM)	Multi‑sensitized; needle‑averse; access or time barriers	Not required; physician‑directed	Home	Very favorable; mostly mild local symptoms	Usually self‑pay; HSA/FSA	4–24 weeks typical	~3 years for durable effect
Allergy shots (SCIT)	Multi‑allergen	Broad efficacy; insurance coverage; clinic access	N/A for first; each injection requires 30‑minute wait	Clinic	Effective; higher systemic‑reaction risk than SLIT	Often medical benefit	Months (6–12 common)	3–5 years

Sources: Wyndly SLIT vs shots, Shot reactions/30‑minute wait, Harvard Health: shots overview

When to start: timing hubs for pollen and dust mites

Ragweed season (late summer–fall): tablet or SLIT planning and season tips. Ragweed guide
Grass season (late spring–summer): common grasses, symptoms, and options. Grass pollen guide
Dust mite (year‑round): exposure control + SLIT options (HDM tablet or drops). Dust‑mite guide
Pollen immunotherapy from home: end‑to‑end care. Pollen SLIT care

Clinical note: For seasonal tablets, many regimens begin before the expected pollen peak (commonly 8–12 weeks pre‑season) per product label; HDM tablets and drops are taken continuously.

How Wyndly supports both paths

Test at home for 40+ environmental allergens, meet online with a board‑certified physician, and choose the best path (FDA SLIT tablet when appropriate or physician‑directed multi‑allergen drops). Allergy test, Online consult
Medical rigor: clinicians follow AAO‑HNS guidance; SLIT is backed by Cochrane reviews and decades of trials. Immunotherapy overview
Safety and access: at‑home dosing after appropriate first‑dose supervision for tablets; 24/7 care team; HSA/FSA eligible. Safety
Real‑world timelines: many patients see benefits in 4–8 weeks, most by 6 months; typical course ~3 years for durable relief. Onset timeline

Key references and data points