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Comparison of clonidine and oxycodone following tonsillotomy surgery in children to help pain management.

CLOWNFISH: Clonidine compared with oxycodone following tonsillotomy - a novel opioid free postoperative treatment option - investigating safety and health outcomes

Status
Recruiting
Phases
Phase 4
Study type
Interventional
Source
ANZCTR
Registry ID
ACTRN12625001140448
Acronym
CLOWNFISH
Enrollment
1
Registered
2025-10-17
Start date
2026-01-29
Completion date
2028-11-03
Last updated
2026-02-16

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

None listed

Brief summary

Tonsil surgery is one of the most common childhood surgical procedures, however the postoperative recovery is often long and challenging for children and their families. Opioids are a common analgesic following tonsil surgery, and although effective, they have notable side effects including respiratory depression, nausea and vomiting and constipation. This study aims to explore if clonidine can provide comparable, non-opioid pain management to oxycodone for post-operative pain following tonsillotomy.

Interventions

Following informed written parental consent, paediatric patients, aged 3– 8 years, undergoing tonsillotomy surgery will be randomised to receive either oral clonidine (2mcg/kg 6-hourly pro re nata (PRN)) or standard care (oral Oxycodone 1mg/ml) solution for breakthrough pain as required analgesia for 10 weight adjusted doses total as an adjunct therapy to the standard treatment (regular paracetamol and Ibuprofen up to 7 days as prescribed by treating team) provided postoperatively and after disc

Following informed written parental consent, paediatric patients, aged 3– 8 years, undergoing tonsillotomy surgery will be randomised to receive either oral clonidine (2mcg/kg 6-hourly pro re nata (PRN)) or standard care (oral Oxycodone 1mg/ml) solution for breakthrough pain as required analgesia for 10 weight adjusted doses total as an adjunct therapy to the standard treatment (regular paracetamol and Ibuprofen up to 7 days as prescribed by treating team) provided postoperatively and after discharge. Post- Post anaesthesia care unit (PACU) discharge for those in the clonidine group, clonidine will be their first line as required medication for pain. There will be active follow up with the families to ensure study adherence. All families are provided with a standard diary to document medication administration following tonsillectomy surgery. Our families will also be provided with a study diary where they will document further information. They will also report this in the study database via survey links sent daily.

Sponsors

Perth Children's Hospital
Lead SponsorHospital

Study design

Allocation
Randomised controlled trial
Intervention model
Parallel
Primary purpose
Treatment
Masking
Open (masking not used)

Eligibility

Sex/Gender
All
Age
3 Years to 8 Years
Healthy volunteers
No

Inclusion criteria

Children aged 3 to 8.99 years undergoing elective surgery under general anaesthesia for tonsillotomy +/- adenoidectomy +/- grommets +/- EUA or cautery of inferior turbinates.

Exclusion criteria

Currently taking clonidine or guanfacine medication. Known cardiovascular, respiratory or neurological disorders giving an ASA III or above status. Known hypersensitivity to the active substance or to any of the excipients listed. Language barriers impeding data collection. Department for Child Protection and Family Support is involved in their care. Planned admissions to the Paediatric Intensive Care Unit (PICU). Any concern in the ability of the parents/guardian or child to appropriately adhere to the study protocol or any issues which, in the investigator’s opinion, would increase the risks of study participation to the child.

Outcome results

None listed

Source: ANZCTR · Data processed: Feb 19, 2026