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Trial details imported from

For full trial details, please see the original record at

Registration number
Ethics application status
Date submitted
Date registered
Date last updated

Titles & IDs
Public title
Topical Versus Oral Metronidazole Following Excisional Haemorrhoidectomy
Scientific title
A Prospective, Multicentre, Double-Blinded Randomised Controlled Trial Comparing Topical Versus Oral Metronidazole in Reducing Post-Operative Pain Following Excisional Haemorrhoidectomy
Secondary ID [1] 0 0
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Hemorrhoids 0 0
Postoperative Pain 0 0
Condition category
Condition code
Cardiovascular 0 0 0 0
Diseases of the vasculature and circulation including the lymphatic system
Oral and Gastrointestinal 0 0 0 0
Other diseases of the mouth, teeth, oesophagus, digestive system including liver and colon

Study type
Description of intervention(s) / exposure
Treatment: Drugs - Metronidazole Oral
Treatment: Drugs - Metronidazole Ointment
Treatment: Drugs - Placebo Oral Tablet
Treatment: Drugs - Placebo Ointment

Experimental: Group A - Oral - Oral metronidazole 400mg 3 times a day for 7 days Placebo ointment applied 3 time times a day for 7 days to affected region

Experimental: Group B - Topical - Topical metronidazole ointment 10% 3 times a day for 7 days Oral placebo tablets 3 times a day for 7 days

Treatment: Drugs: Metronidazole Oral
Oral Metronidazole

Treatment: Drugs: Metronidazole Ointment
Metronidazole Ointment

Treatment: Drugs: Placebo Oral Tablet
Placebo Tablet

Treatment: Drugs: Placebo Ointment
Placebo Ointment

Intervention code [1] 0 0
Treatment: Drugs
Comparator / control treatment
Control group

Primary outcome [1] 0 0
Daily Post-Operative Pain - Daily Post-Operative Pain Measured on Visual Analogue Scale (0 to 10)
Timepoint [1] 0 0
Day 7
Secondary outcome [1] 0 0
Total Analgesia Use - Measured in Morphine Equivalent Doses
Timepoint [1] 0 0
Day 7
Secondary outcome [2] 0 0
Complication Rates - Short term complication rates including adverse reactions, bleeding, paraesthesiae, urinary retention, readmission
Timepoint [2] 0 0
Day 30
Secondary outcome [3] 0 0
Return to Normal Activity - Time to return back to normal activity
Timepoint [3] 0 0
Day 30 (Followed up until returned back to normal)
Secondary outcome [4] 0 0
Return of Bowel Function - Time for first bowel motion
Timepoint [4] 0 0
Day 7

Key inclusion criteria
- All patients undergoing excisional haemorrhoidectomy
Minimum age
16 Years
Maximum age
No limit
Both males and females
Can healthy volunteers participate?
Key exclusion criteria
- < 16 years of age

- Have a simultaneous operation other than excisional haemorrhoidectomy

- History of chronic pain

- Previous allergy/adverse reaction to metronidazole

- Patients unable to consent or complete data questionnaires due to cognitive impairment

Study design
Purpose of the study
Allocation to intervention
Randomised controlled trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Masking / blinding
Blinded (masking used)
Who is / are masked / blinded?
The people receiving the treatment/s
The people administering the treatment/s
The people assessing the outcomes
The people analysing the results/data
Intervention assignment
Other design features
Phase 4
Type of endpoint(s)
Statistical methods / analysis

Recruitment status
Data analysis
Reason for early stopping/withdrawal
Other reasons
Date of first participant enrolment
Date of last participant enrolment
Date of last data collection
Sample size
Accrual to date
Recruitment in Australia
Recruitment state(s)
Recruitment outside Australia
Country [1] 0 0
New Zealand
State/province [1] 0 0

Funding & Sponsors
Primary sponsor type
University of Auckland, New Zealand

Ethics approval
Ethics application status

Brief summary
This study aims to determine if topical metronidazole reduces pain more than oral
metronidazole following excisional haemorrhoidectomy. The trial will be a multi-centered,
patient and investigator blinded superiority trial with two parallel groups and a primary
outcome of pain scores during 14 days after surgery.

Group A will receive oral metronidazole and placebo cream. Group B will receive placebo
tablets and topical metronidazole cream.
Trial website
Trial related presentations / publications
Public notes

Principal investigator
Name 0 0
Andrew G Hill, MBChB
Address 0 0
The University of Auckland
Country 0 0
Phone 0 0
Fax 0 0
Email 0 0
Contact person for public queries
Name 0 0
Weisi Xia, MBChB
Address 0 0
Country 0 0
Phone 0 0
Fax 0 0
Email 0 0
Contact person for scientific queries

Summary results
For IPD and results data, please see