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Analgesic Effect of Ibuprofen, Paracetamol (Acetaminophen), and Paracetamol (Acetaminophen) Plus Codeine on Acute Pain

Information source: Oslo University Hospital
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Surgery

Intervention: Placebo (Drug); Ibuprofen 400 mg (Drug); Ibuprofen 600 mg (Drug); Ibuprofen 800 mg (Drug); Paracetamol (acetaminophen) 500 mg (Drug); Paracetamol (acetaminophen) 1000 mg (Drug); Paracetamol (acetaminophen) 1000 mg + codeine 60 mg (Drug)

Phase: Phase 4

Status: Completed

Sponsored by: Ullevaal University Hospital

Official(s) and/or principal investigator(s):
Lasse A Skoglund, DDS, DSCi, Study Chair, Affiliation: Section of Dental Pharmacology and Pharmacotherapy, ICD, Faculty of Dentistry, University of Oslo, POB 1119 Blindern, N-0317 Oslo, Norway
Per Skjelbred, MD, DDS, PhD, Study Director, Affiliation: Department of Oral and Maxillofacial Surgery, Ullevaal University Hospital, Kirkeveien 166, N-0407 Oslo, Norway
Gaute Lyngstad, DDS, Principal Investigator, Affiliation: Section of Dental Pharmacology and Pharmacotherapy, ICD, Faculty of Dentistry, University of Oslo, POB 1119 Blindern, N0317 Oslo, Norway


The purpose of this placebo controlled clinical trial is to evaluate the dose response relationship of ibuprofen in doses from 400 mg to 800 mg and paracetamol (acetaminophen)in doses from 500 mg to 1000 mg compared with paracetamol (acetaminophen)1000 mg plus codeine 60 mg on acute postoperative pain after surgical removal of impacted third molars.

Clinical Details

Official title: Analgesic Effect of Ibuprofen 400, 600 and 800 mg, Paracetamol 500 and 1000 mg, and Paracetamol 1000 mg Plus 60 mg Codeine: Single-dose, Randomized, Placebo-controlled and Double-blind Study on Acute Pain After Third Molar Surgery

Study design: Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Treatment

Primary outcome: Sum Pain Intensity Score(SPI)

Secondary outcome:

Sum Pain Intensity Difference Score (SPID)

Sum Pain Intensity Score (SPI)

Sum Pain Intensity Difference Score (SPID)

Maximum Pain Intensity Difference Score (MAXPID)

Time to Maximum Pain Intensity Difference Score

Self-reported Occurrence of Adverse Effects

Self-reported Occurrence of Adverse Effects

Detailed description: Acetaminophen (paracetamol) and related aspirin-like drugs have traditionally been used for pain control of minor to moderate postoperative pain. Gradually traditional non-steroidal anti-inflammatory drugs (NSAIDs) have become more popular as analgesics due to assumed superior therapeutic effects and aggressive marketing campaigns orchestrated by the pharmaceutical industry. Ibuprofen is a widely used analgesic both in non-prescription and prescription doses. A dose-response relationship for low ibuprofen doses is shown. Evidence of a progressing dose response relationship for moderate (i. e. 400 mg) to higher doses is scarce. A possible analgesic ceiling effect has been suggested for doses above 400 mg, although a correlation between given ibuprofen doses above 400 mg and patient serum levels is shown. However, it may be questioned if the plasma concentration of ibuprofen is an important determinator of analgesic drug efficacy. A higher dose is more likely to influence the duration of analgesic effect rather than the peak analgesic effect. There are few clinical trials investigating the dose-response relationship of increasing ibuprofen doses and paracetamol doses. To our knowledge no published study has investigated the dose-response relationship of ibuprofen and paracetamol in the same trial with a negative (i. e. placebo) and a positive (i. e. best standard analgesic treatment) control group.


Minimum age: 18 Years. Maximum age: 30 Years. Gender(s): Both.


Inclusion Criteria:

- Patients of both sexes referred for surgical removal of impacted third molars, due to

symptoms or after being advised to do so by their dentist.

- Persons of both sexes (ASA type I).

- Females who are not pregnant or plan conception.

- Persons who have not used analgesics for 3 days prior to the day of surgery.

- Persons without known active ulcus or gastrointestinal bleeding.

- Persons without any known hypersensitivity for NSAIDs.

- Persons under no other continuous drug treatment than contraceptives.

- Caucasian origin.

- Persons with at least moderate postoperative pain as defined by subjective score on a

verbal rating scale after surgical removal of third molars. Exclusion Criteria:

- Patients with surgery time exceeding 60 minutes

- Peroperative complications such as profuse bleeding or perforation to the maxillary

sinus requiring additional drug treatment during or after the surgical removal of the third molar.

- Postoperative complications such as extended bleeding, nausea and regurgitation

during the observation period.

- Smoking before taking the test-drug or during the observation period.

Locations and Contacts

Department of Oral and Maxillofacial Surgery, Ullevaal University Hospital, Oslo N-0407, Norway
Additional Information

Starting date: June 2007
Last updated: July 3, 2011

Page last updated: August 23, 2015

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