GlaxoSmithKline will be conducting this trial to compare analgesics efficacy of paracetamol 1000mg vs 500mg . The post-surgical dental pain model will be used to evaluate the analgesic efficacy of paracetamol. Each subject will be enrolled in the study for up to six weeks. The duration of the entire study will be approximately 16 weeks. Each subject will have to come to the clinic for three visits (Screening, Treatment and Follow up visits).
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
300
PPD Dental Clinic
Austin, Texas, United States
Jean Brown Research
Salt Lake City, Utah, United States
Sum of Pain Relief and Pain Intensity Differences From 0 to 6 Hours (SPRID 6 Hours)
SPRID:Sum of Pain Intensity Difference (SPID) and Total Pain Relief (TOTPAR) at each post-dosing time-point. SPRID score ranged from -5.8 (least pain relief) to 40.3 (highest pain relief). SPID and TOTPAR were calculated as weighted sums of Pain Intensity Differences (PID) and Pain Relief Scores (PRS) at each measurement time, respectively. PID was derived by subtracting the pain severity score at a given post-dosing time-point from the baseline \[pain severity score range:0-no pain, 1-mild pain, 2-moderate pain, 3-severe pain using a 4-point categorical Verbal Rating Scale (VRS)\]. If the subject rated pain intensity as 2 or 3, pain was assessed using a 100 mm Visual Analog Scale (VAS) \[0 (no pain), 100 (worst pain)\]. VAS scores were converted into PID scores by subtracting them from baseline pain scores. PRS was assessed on 5-point categorical pain relief rating scale \[0-no relief, 1-little relief, 2-some relief, 3-a lot of relief, 4-complete relief\]
Time frame: Every two hours from baseline to 6 hours post dose
Time to Confirmed First Perceptible Pain Relief
Participants recorded the time to first perceptible relief by starting the first stopwatch at the time of dosing and stopping it when he/she experienced the first perceptible pain relief. The first perceptible pain relief was confirmed if the participant also stopped the second stopwatch indicating meaningful relief.
Time frame: Baseline to 6 hours post dose
Time to Onset of Meaningful Pain Relief
Participants evaluated the time to meaningful relief by stopping a second stopwatch when they first began to experience meaningful relief.
Time frame: Baseline to 6 hours post dose
Time to Start Using Rescue Medication
Median time of use of rescue medication by participants was calculated.
Time frame: Baseline to 6 hours post dose
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Percentage of Participants Who Took Rescue Medication Within 2 Hours
Percentage of participants who received rescue medication within 2 hours
Time frame: Baseline to 2 hours post dose
Percentage of Participants Who Took Rescue Medication During 2 to 6 Hours
Percentage of participants who took rescue medication during 2 to 6 hours
Time frame: Within 2 to 6 hours post dose
SPRID at 2 Hours
SPRID:Sum of Pain Intensity Difference (SPID) and Total Pain Relief (TOTPAR) at each post-dosing time-point. SPRID score ranged from -1.8 (least pain relief) to 12.3 (highest pain relief). SPID and TOTPAR were calculated as weighted sums of Pain Intensity Differences (PID) and Pain Relief Scores (PRS) at each measurement time, respectively. PID was derived by subtracting the pain severity score at a given post-dosing time-point from the baseline \[pain severity score range:0-no pain, 1-mild pain, 2-moderate pain, 3-severe pain using a 4-point categorical Verbal Rating Scale (VRS)\]. If the subject rated pain intensity as 2 or 3, pain was assessed using a 100 mm Visual Analog Scale (VAS) \[0 (no pain), 100 (worst pain)\]. VAS scores were converted into PID scores by subtracting them from baseline pain scores. PRS was assessed on 5-point categorical pain relief rating scale \[0-no relief, 1-little relief, 2-some relief, 3-a lot of relief, 4-complete relief\]
Time frame: Every two hours from baseline to 2 hours post dose
SPRID at 4 Hours
SPRID:Sum of Pain Intensity Difference (SPID) and Total Pain Relief (TOTPAR) at each post-dosing time-point. SPRID score ranged from -3.8 (least pain relief) to 26.3 (highest pain relief). SPID and TOTPAR were calculated as weighted sums of Pain Intensity Differences (PID) and Pain Relief Scores (PRS) at each measurement time, respectively. PID was derived by subtracting the pain severity score at a given post-dosing time-point from the baseline \[pain severity score range:0-no pain, 1-mild pain, 2-moderate pain, 3-severe pain using a 4-point categorical Verbal Rating Scale (VRS)\]. If the subject rated pain intensity as 2 or 3, pain was assessed using a 100 mm Visual Analog Scale (VAS) \[0 (no pain), 100 (worst pain)\]. VAS scores were converted into PID scores by subtracting them from baseline pain scores. PRS was assessed on 5-point categorical pain relief rating scale \[0-no relief, 1-little relief, 2-some relief, 3-a lot of relief, 4-complete relief\]
Time frame: Every two hours from baseline to 4 hours post dose
Total Pain Relief (TOTPAR) at 2 Hours
TOTPAR was calculated as sum of products of pain relief (PR) at a given time-point (t) with the time-interval from that time-point to the previous time-point (t-1). The time-intervals used were 0-15, 15-30, 30-45, 45-60, 60-90, 90-120. Higher score indicated greater pain relief. TOTPARt = ∑PR x (timet - timet-1). PR score was assessed at each of the above time-points based on a 5-point categorical scale \[0-no relief, 1-little relief, 2-meaningful relief, 3-a lot of relief, 4-complete relief\].
Time frame: Every two hours from baseline to 2 hours post dose
TOTPAR at 4 Hours
TOTPAR was calculated as sum of products of pain relief (PR) at a given time-point (t) with the time-interval from that time-point to the previous time-point (t-1). The time-intervals used were 0-15, 15-30, 30-45, 45-60, 60-90, 90-120, 120-240. Higher score indicated greater pain relief. TOTPARt = ∑PR x (timet - timet-1). PR score was assessed at each of the above time-points based on a 5-point categorical scale \[0-no relief, 1-little relief, 2-meaningful relief, 3-a lot of relief, 4-complete relief\].
Time frame: Every two hours from baseline to 4 hours post dose
TOTPAR at 6 Hours
TOTPAR was calculated as sum of products of pain relief (PR) at a given time-point (t) with the time-interval from that time-point to the previous time-point (t-1). The time-intervals used were 0-15, 15-30, 30-45, 45-60, 60-90, 90-120, 120-240, 240-300 and 300-360. Higher score indicated greater pain relief. TOTPARt = ∑PR x (timet - timet-1). PR score was assessed at each of the above time-points based on a 5-point categorical scale \[0-no relief, 1-little relief, 2-meaningful relief, 3-a lot of relief, 4-complete relief\].
Time frame: Every two hours from baseline to 6 hours post dose
Sum of Pain Intensity Difference (SPID) Scores at 2 Hours
SPID was calculated as sum of products of Pain Intensity Differences (PID) at a given time-point (t) with the time-interval from that time-point to the previous time-point (t-1). The time-intervals used were 0-15, 15-30, 30-45, 45-60, 60-90, 90-120. Positive and higher scores indicate greater reduction in pain. SPIDt = ∑PID x (timet - timet-1) Pain Intensity was assessed at baseline and at each time-point based on a 4-point categorical Verbal Rating Scale (VRS) scale: 0-no pain, 1-mild pain, 2-moderate pain, 3-severe pain. If the subject rated pain intensity as "2" or "3", pain was assessed using a 100 mm Visual Analog Scale (VAS) \[0 (no pain), 100 (worst pain)\]. VAS scores were converted into PID scores by subtracting them from pain scores taken at baseline.
Time frame: Every two hours from baseline to 2 hours post dose
SPID Scores at 4 Hours
SPID was calculated as sum of products of Pain Intensity Differences (PID) at a given time-point (t) with the time-interval from that time-point to the previous time-point (t-1). The time-intervals used were 0-15, 15-30, 30-45, 45-60, 60-90, 90-120, 120-240. Positive and higher scores indicate greater reduction in pain. SPIDt = ∑PID x (timet - timet-1) Pain Intensity was assessed at baseline and at each time-point based on a 4-point categorical Verbal Rating Scale (VRS) scale: 0-no pain, 1-mild pain, 2-moderate pain, 3-severe pain. If the subject rated pain intensity as "2" or "3", pain was assessed using a 100 mm Visual Analog Scale (VAS) \[0 (no pain), 100 (worst pain)\]. VAS scores were converted into PID scores by subtracting them from pain scores taken at baseline.
Time frame: Every two hours from baseline to 4 hours post dose
SPID Scores at 6 Hours
SPID was calculated as sum of products of Pain Intensity Differences (PID) at a given time-point (t) with the time-interval from that time-point to the previous time-point (t-1). The time-intervals used were 0-15, 15-30, 30-45, 45-60, 60-90, 90-120, 120-240, 240-300 and 300-360. Positive and higher scores indicate greater reduction in pain. SPIDt = ∑PID x (timet - timet-1) Pain Intensity was assessed at baseline and at each time-point based on a 4-point categorical Verbal Rating Scale (VRS) scale: 0-no pain, 1-mild pain, 2-moderate pain, 3-severe pain. If the subject rated pain intensity as "2" or "3", pain was assessed using a 100 mm Visual Analog Scale (VAS) \[0 (no pain), 100 (worst pain)\]. VAS scores were converted into PID scores by subtracting them from pain scores taken at baseline.
Time frame: Every two hours from baseline to 6 hours post dose
Participants Global Assessment to Response to Treatment (PGART)
PGART was measured by a score in a scale from 0-4: 0- Poor; 1- Fair 2- Good; 3- Very Good; 4- Excellent.
Time frame: Baseline to 6 hours post dose