Choose the Label Fit for Your Dog’s Trigger

Neither medicine is universally better. Tessie is the label-matched option to ask about for diagnosed separation anxiety because it is approved for separation anxiety and noise aversion; Sileo is approved only for noise aversion. For predictable fireworks, either label may fit. If noise fear has already begun, Sileo’s label specifically allows the first application then, while Tessie is generally given about one hour before the expected trigger. No head-to-head trial shows that either is more effective, faster, longer-lasting, easier to give, or safer overall.

The FDA approved Tessie, a tasipimidine oral solution, on May 6, 2026 as the first drug indicated for both noise aversion and separation anxiety in dogs. Sileo is a dexmedetomidine oromucosal gel. Both are prescription alpha-2 adrenoceptor agonists, but they have different administration methods, timing instructions, food rules, and redosing limits. The FDA’s Tessie approval announcement provides its indications and general administration instructions.

Choose the trigger and timing details; the tool shows which label fits and calculates the dose-timing limits to discuss with your veterinarian.

Tessie and Sileo Differ Most on Indication and Route

Feature	Tessie	Sileo
Approved use	Noise aversion and separation anxiety	Noise aversion
Form	Oral solution that is swallowed	Gel placed between cheek and gum
First dose	About 1 hour before noise or departure	30–60 minutes before noise, at first signs, or when triggering noise is detected
Repeat limit	Up to 3 times in 24 hours; at least 3 hours apart	At least 2 hours apart; no more than 5 applications during one noise event

Tessie must be swallowed. It should not be given with food, and the FDA says to wait at least one hour after feeding. A small treat may be used to help the dog swallow the solution.

Sileo is absorbed through the oral mucosa and is not intended to be swallowed. The gel must be placed between the cheek and gum rather than on the tongue. Food and treats should be avoided for 15 minutes afterward. If the gel is swallowed, it may not work effectively; the label says not to replace that application immediately and not to give another for at least two hours. These instructions appear in Sileo’s FDA-approved prescribing information.

Both require a veterinary prescription. The veterinarian’s directions and the information dispensed with the product should determine the schedule for an individual dog.

Tessie’s Broader Indication Covers Separation Anxiety

Tessie is the first FDA-approved treatment indicated for both canine noise aversion and separation anxiety. Sileo’s indication is noise aversion; its label does not cover separation anxiety.

That distinction applies only after the underlying behavior has been assessed. Hiding, vocalizing, panting, trembling, vomiting, urinating, defecating, and destructive behavior can occur with noise aversion or separation anxiety, but none proves a diagnosis by itself. Door damage may accompany separation-related distress, for example, while panting and trembling can have behavioral or medical causes.

Departure videos can help a veterinarian see when signs begin, what happens when someone stays home, and whether the dog settles or remains distressed. If separation anxiety is diagnosed and a situational prescription is considered, Tessie has the directly relevant indication. Its broader approval does not prove that it works better for noise aversion.

Neither label automatically extends to travel anxiety, boredom, generalized anxiety, or every type of destructive behavior.

Administration Feasibility May Determine the Practical Choice

Tessie is generally given about one hour before an expected noise or before the owner leaves. That requires enough warning to plan around both the event and the one-hour post-feeding wait. The owner must also be able to get the liquid swallowed reliably.

Sileo’s first application may be given 30–60 minutes before anticipated noise, when initial noise-related fear appears, or when the owner detects the kind of noise that usually triggers the dog. This may help when the exact start time is uncertain, but it does not prove faster action.

Correct Sileo placement can become difficult once fear has escalated. An adult must operate the syringe and place the gel against the gum without spilling it, putting it on the tongue, or being bitten. Do not force oral handling when a frightened dog may bite. Ask the veterinary team to demonstrate the technique before the anticipated event.

A dog that readily swallows liquid but resists cheek handling presents a different practical problem from a dog that refuses liquid but tolerates gum placement. Those differences can guide the veterinary discussion, but they do not establish that either route is inherently easier or more effective.

Redosing Limits Do Not Guarantee Continuous Coverage

Tessie may be administered up to three times in 24 hours, with at least three hours between administrations. Sileo may be repeated if signs return after two to three hours, but at least two hours must pass between applications and no more than five applications may be given during one noise event.

Those are maximum label boundaries, not instructions to redose automatically. The published limits do not establish that one application will cover a specific number of hours alone or an entire fireworks display. Before another administration, follow the prescription and consider the elapsed time, whether the first dose was delivered correctly, and the dog’s current condition.

Unusual sleepiness, weakness, poor coordination, vomiting, or another concerning change calls for veterinary guidance rather than an assumed repeat dose. The same applies when the amount delivered or placement of Sileo is uncertain.

Only Sileo Has Quantified Fireworks Results Here

No direct clinical trial compares Tessie with Sileo. The available evidence cannot establish that one has a higher success rate, starts working faster, lasts longer, or performs better for noise aversion.

Sileo has controlled evidence for fireworks-related fear. In a randomized, double-blind, multicenter, vehicle-controlled study, owners rated the treatment effect good or excellent for 53 of 71 Sileo-treated dogs, compared with 24 of 73 control dogs—approximately 75% versus 33%. Treated dogs also had lower behavioral scores for panting, trembling, and hiding. The study details appear in the FDA-approved prescribing information.

That result shows benefit over the vehicle control in that study, not superiority over Tessie. Tessie was not the comparator. Eighteen of the 71 Sileo-treated dogs also were not rated as having a good or excellent effect.

The FDA announcement for Tessie confirms its approval, indications, mechanism, and basic timing, food, and repeat-use instructions. It does not provide approval-trial response rates needed for a numerical comparison with Sileo or a complete U.S. safety profile. More published detail for Sileo does not prove that it is more effective or safer. Tessie’s broader indication likewise does not prove greater effectiveness for noise aversion.

Sileo’s controlled results concern fireworks. Its prescribing information says aversion behaviors associated with thunderstorms were not evaluated, so the fireworks percentages should not be presented as thunderstorm-specific evidence.

Sileo Requires Sedation and Cardiovascular Precautions

Sileo’s prescribing information reports or warns about drowsiness or sedation, vomiting, pale oral mucous membranes, tremor, impaired coordination, urinary effects, reduced heart rate, and reduced body temperature.

It is contraindicated in dogs with severe cardiovascular, respiratory, liver, or kidney disease and in dogs in shock or severe debilitation. Its label also addresses pre-existing hypotension, hypoxia, or bradycardia; stress caused by extreme heat, cold, or fatigue; and dogs that remain sedated from an earlier application.

Other central nervous system depressants may intensify Sileo’s effects. Give the veterinarian a complete list of prescription drugs, as-needed medicines, over-the-counter products, supplements, and calming products. “Situational” does not mean non-sedating or risk-free.

The person administering Sileo should wear impermeable disposable gloves and avoid skin, eye, and mouth contact. Accidental human exposure may cause sedation and blood-pressure changes and requires immediate medical attention. Store the product where children and other people cannot handle it.

Tessie’s Complete Safety Information Must Be Checked at Dispensing

The Tessie FDA announcement used for this comparison does not provide a complete list of adverse effects, contraindications, interactions, overdose instructions, or special-population precautions. That omission cannot be treated as evidence that Tessie lacks risks, nor should every Sileo warning automatically be transferred to Tessie.

Before use, ask the veterinarian to review the prescribing information supplied with Tessie, including interactions with sedatives or anxiety medicines, medical exclusions, adverse effects, overdose instructions, and considerations involving age, pregnancy, nursing, or breeding status. Ask which signs mean no further medicine should be given and which require urgent care.

Do not combine either product with trazodone, gabapentin, clonidine, or another calming or sedating medicine without explicit veterinary instructions. Complete U.S. Tessie interaction information is not contained in the FDA announcement reviewed here, so combination safety should not be assumed.

The Sileo Syringe Design Must Be Verified

The FDA received reports of accidental canine overdoses associated with the earlier Sileo syringe’s ring-stop mechanism failing to lock properly. In a July 3, 2023 update, the agency described a redesign in which the dosing ring twists along a threaded plunger instead of moving freely and requiring a separate locking step.

The FDA said the redesigned syringe was expected to become available in 2024 with updated packaging and training materials. That projection does not confirm which syringe is inside every package now being dispensed. Inspect the carton and syringe, read the client information packaged with it, and ask the veterinary team or pharmacist for a demonstration. The design history is detailed in the FDA’s Sileo syringe safety update.

The historical device problem is a reason to verify and carefully operate the actual syringe. It does not establish that Sileo is categorically less safe than Tessie.

Trigger-Specific Scenarios Narrow the Discussion

Diagnosed Separation Anxiety Favors Tessie’s Label

Tessie has the directly relevant indication when a veterinarian diagnoses separation anxiety. Its advance timing may fit a predictable departure, but the published information does not establish how many hours a dose will cover while a dog is alone.

Bring departure videos and a timeline showing when signs begin, how long they last, and whether another person’s presence changes the pattern.

Predictable Fireworks Fit Both Indications

Both products are approved for noise aversion. Sileo has controlled fireworks evidence; the Tessie announcement does not provide an equivalent response rate.

The practical comparison includes food timing, safe gum placement, ability to swallow liquid, other medicines, previous reactions, and how long the event may last. Route preference alone does not predict success.

Fear That Has Begun Matches Sileo’s Timing Language

Sileo’s label permits the first application when initial noise-related fear appears or when a typical triggering noise is detected. Tessie is generally described as being given about one hour before the expected noise.

This is a label-timing difference, not evidence that Sileo acts faster. If the dog is already highly distressed, approaching the mouth may also be unsafe.

Thunderstorms Lack Sileo-Specific Trial Proof

Both noise-aversion indications make thunderstorms reasonable to discuss with a veterinarian. However, Sileo’s prescribing information states that thunderstorm-associated aversion behaviors were not evaluated. Its quantified evidence concerns fireworks, not storms.

Prolonged Events Need a Veterinary Redosing Plan

For hours of fireworks or construction, review the repeat limits before the event. Ask what condition the dog should be in before another administration and which signs mean no more should be given. Continued noise alone is not an instruction to redose.

Bring a Specific Record to the Veterinary Appointment

Record the trigger, expected start time, earliest visible signs, duration, food timing, and whether administration appeared successful. Note changes in panting, trembling, hiding, vocalizing, escape attempts, or destructive behavior, along with drowsiness, vomiting, weakness, pale gums, poor coordination, urinary changes, and recovery time.

Also provide the dog’s heart, respiratory, liver, kidney, dental, or gum disease history; all medicines and supplements; prior reactions to sedatives; and whether an adult can safely administer swallowed liquid or cheek-and-gum gel.

Seek urgent veterinary help for collapse, inability to rouse, breathing difficulty, pale, blue, or grey gums, heavy bleeding, serious injury, or a known or suspected overdose. Recurring fear, destructive escape behavior, or suspected separation anxiety warrants a veterinary assessment rather than repeated improvisation with event medication.

Before filling Tessie, verify its current commercial availability and review the information supplied with it. Before using Sileo, identify the syringe design in the actual package and request a demonstration if its operation or the gel placement is unclear.