Client education · After your consultation
Situational use

Dexmedetomidine

Sileo (oromucosal gel) · Brand names vary by country and preparation.

Give the medication exactly as prescribed. Do not increase, decrease, repeat, combine, or discontinue medication unless instructed by your veterinarian.
Use the product’s supplied handling and administration instructions. If it is swallowed or partly lost, do not give a replacement amount without veterinary advice.

Why this medication may be prescribed

The oromucosal gel may be prescribed for noise-related fear in dogs or selected other stressful situations. This page concerns gel absorbed through the mouth lining, not injectable sedation.

How it works

It reduces release of noradrenaline, a messenger involved in the body’s stress response. It can also slow heart rate and lower blood pressure.

When should I expect an effect?

Effects are intended for the event or period covered by the prescription. Onset and duration depend on the preparation and the animal; follow your veterinarian’s specific timing rather than using a general redosing rule.

What improvement might look like

Depending on the treatment goal, improvement may mean less intense reactions, faster recovery, less avoidance, better rest or greater ability to respond to familiar cues. Complete disappearance of behaviour is not required to see progress.

Medication can reduce fear, anxiety, arousal, impulsivity, or other factors that interfere with learning. Behaviour modification and environmental management remain important parts of treatment.

Common side effects

Sleepiness; gastrointestinal upset; changes in sleep. Occasionally, increased agitation occurs.

Mild effects may be temporary. Persistent or pronounced changes should be discussed with the clinic; do not assume they are harmless.

When should I contact the clinic?

Contact the clinic for persistent vomiting or diarrhea, marked appetite loss, pronounced sedation, stumbling, weakness, unexpected worsening or significant new behaviour. Report difficulty passing urine promptly; inability to pass urine needs urgent veterinary assessment.

When is it an emergency?

Collapse, seizures, marked difficulty breathing, extreme weakness, profound unresponsiveness or rapidly worsening signs require immediate veterinary assessment. Contact the nearest emergency veterinary hospital. Suspected overdose also requires immediate veterinary advice, even if your animal seems well. This list is not exhaustive.

What if I miss a dose?

Follow any missed-dose instructions supplied with your prescription. If none were provided, contact the clinic or your veterinarian for advice about the next dose. Do not double, repeat or make up a dose on your own.

What if I administered an extra dose?

Contact your veterinarian or an emergency veterinary hospital immediately for case-specific advice, even if no signs are visible. Have the packaging and the amount and time given available for the veterinarian. Do not induce vomiting unless instructed. This website cannot determine a safe extra amount.

Can I stop this medication suddenly?

Follow the prescribed event plan. Do not repeat an application or change the amount unless your veterinarian’s instructions specifically direct it.

Do not reduce or discontinue this medication without discussing it with your veterinarian.

Medication and supplement interactions

Medicines that lower blood pressure or cause sedation can intensify effects. Tell any veterinarian planning sedation or anaesthesia that this medicine has been given.

Inform the clinic before adding a prescription, over-the-counter medicine, supplement, herbal product or calming product. This is not a complete interaction list.

What should I monitor?

  • Alertness and ability to stand
  • Fear and recovery after the event
  • Any weakness or unusual sleepiness
  • Time of onset and duration

Bring your observations to follow-up.

Educational information; effects vary between dogs, cats and individuals.