Trial Outcomes & Findings for A Study to Compare Safety and Efficacy of Tramadol Hydrochloride/Acetaminophen With Gabapentin in Participants With Diabetic Neuropathy (NCT NCT00634543)

NCT ID: NCT00634543

Last Updated: 2013-08-12

Results Overview

Pain intensity was assessed on 11-point numerical rating scale ranging from 0=no pain to 10=pain as bad as you can imagine.

Recruitment status

COMPLETED

Study phase

PHASE4

Target enrollment

162 participants

Primary outcome timeframe

Baseline and Day 43

Results posted on

2013-08-12

Participant Flow

Participant milestones

Participant milestones
Measure
Tramadol Hydrochloride/ Acetaminophen
Participants received 1 tablet containing tramadol hydrochloride (HCl) 37.5 milligram (mg) and acetaminophen 325 mg, once daily, at bed time on Day 1 to 3, 1 tablet twice daily on Day 4 to 7 and 1 tablet thrice daily on Day 8 to 14. If there was no pain relief, the dosage were increased up to 8 tablets per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Gabapentin
Participants received gabapentin 300 mg once daily at bed time on Day 1, 300 mg twice daily on Day 2 and 300 mg thrice daily on Day 3. Gabapentin 300 mg was administered twice daily (in the morning and midday) and gabapentin 600 mg in the evening on Day 8 to 14. If there was no pain relief, the dosage were increased up to 3600 mg per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Overall Study
STARTED
78
84
Overall Study
Treated
76
80
Overall Study
COMPLETED
59
63
Overall Study
NOT COMPLETED
19
21

Reasons for withdrawal

Reasons for withdrawal
Measure
Tramadol Hydrochloride/ Acetaminophen
Participants received 1 tablet containing tramadol hydrochloride (HCl) 37.5 milligram (mg) and acetaminophen 325 mg, once daily, at bed time on Day 1 to 3, 1 tablet twice daily on Day 4 to 7 and 1 tablet thrice daily on Day 8 to 14. If there was no pain relief, the dosage were increased up to 8 tablets per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Gabapentin
Participants received gabapentin 300 mg once daily at bed time on Day 1, 300 mg twice daily on Day 2 and 300 mg thrice daily on Day 3. Gabapentin 300 mg was administered twice daily (in the morning and midday) and gabapentin 600 mg in the evening on Day 8 to 14. If there was no pain relief, the dosage were increased up to 3600 mg per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Overall Study
Other
1
2
Overall Study
Protocol Violation
3
3
Overall Study
Adverse Event
11
11
Overall Study
Withdrawal by Subject
4
4
Overall Study
Lost to Follow-up
0
1

Baseline Characteristics

A Study to Compare Safety and Efficacy of Tramadol Hydrochloride/Acetaminophen With Gabapentin in Participants With Diabetic Neuropathy

Baseline characteristics by cohort

Baseline characteristics by cohort
Measure
Tramadol Hydrochloride/ Acetaminophen
n=71 Participants
Participants received 1 tablet containing tramadol hydrochloride (HCl) 37.5 milligram (mg) and acetaminophen 325 mg, once daily, at bed time on Day 1 to 3, 1 tablet twice daily on Day 4 to 7 and 1 tablet thrice daily on Day 8 to 14. If there was no pain relief, the dosage were increased up to 8 tablets per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Gabapentin
n=76 Participants
Participants received gabapentin 300 mg once daily at bed time on Day 1, 300 mg twice daily on Day 2 and 300 mg thrice daily on Day 3. Gabapentin 300 mg was administered twice daily (in the morning and midday) and gabapentin 600 mg in the evening on Day 8 to 14. If there was no pain relief, the dosage were increased up to 3600 mg per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Total
n=147 Participants
Total of all reporting groups
Age Continuous
58.2 Years
STANDARD_DEVIATION 7.4 • n=93 Participants
56.6 Years
STANDARD_DEVIATION 9.3 • n=4 Participants
57.4 Years
STANDARD_DEVIATION 8.4 • n=27 Participants
Sex: Female, Male
Female
34 Participants
n=93 Participants
45 Participants
n=4 Participants
79 Participants
n=27 Participants
Sex: Female, Male
Male
37 Participants
n=93 Participants
31 Participants
n=4 Participants
68 Participants
n=27 Participants

PRIMARY outcome

Timeframe: Baseline and Day 43

Population: Full analysis set (FAS) included all randomly assigned participants who met the eligiblility criteria and had at least 1 post-baseline efficacy assessment data. Last observation carried forward (LOCF) was used.

Pain intensity was assessed on 11-point numerical rating scale ranging from 0=no pain to 10=pain as bad as you can imagine.

Outcome measures

Outcome measures
Measure
Tramadol Hydrochloride/ Acetaminophen
n=71 Participants
Participants received 1 tablet containing tramadol hydrochloride (HCl) 37.5 milligram (mg) and acetaminophen 325 mg, once daily, at bed time on Day 1 to 3, 1 tablet twice daily on Day 4 to 7 and 1 tablet thrice daily on Day 8 to 14. If there was no pain relief, the dosage were increased up to 8 tablets per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Gabapentin
n=76 Participants
Participants received gabapentin 300 mg once daily at bed time on Day 1, 300 mg twice daily on Day 2 and 300 mg thrice daily on Day 3. Gabapentin 300 mg was administered twice daily (in the morning and midday) and gabapentin 600 mg in the evening on Day 8 to 14. If there was no pain relief, the dosage were increased up to 3600 mg per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Change From Baseline in Pain Intensity Score at Day 43
Baseline
6.65 Units on a scale
Standard Deviation 1.60
6.30 Units on a scale
Standard Deviation 1.58
Change From Baseline in Pain Intensity Score at Day 43
Change at Day 43
3.15 Units on a scale
Standard Deviation 1.83
2.76 Units on a scale
Standard Deviation 1.97

SECONDARY outcome

Timeframe: Day 15, Day 29 and Day 43

Population: FAS included all randomly assigned participants who met the eligiblility criteria and had at least 1 post-baseline efficacy assessment data. Last observation carried forward (LOCF) was used.

Pain relief was assessed on a scale ranging from -1 to 4, where -1=became worse, 0=no change, 1=relieved a little, 2=relieved moderately, 3=relieved a lot and 4=completely resolved.

Outcome measures

Outcome measures
Measure
Tramadol Hydrochloride/ Acetaminophen
n=71 Participants
Participants received 1 tablet containing tramadol hydrochloride (HCl) 37.5 milligram (mg) and acetaminophen 325 mg, once daily, at bed time on Day 1 to 3, 1 tablet twice daily on Day 4 to 7 and 1 tablet thrice daily on Day 8 to 14. If there was no pain relief, the dosage were increased up to 8 tablets per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Gabapentin
n=76 Participants
Participants received gabapentin 300 mg once daily at bed time on Day 1, 300 mg twice daily on Day 2 and 300 mg thrice daily on Day 3. Gabapentin 300 mg was administered twice daily (in the morning and midday) and gabapentin 600 mg in the evening on Day 8 to 14. If there was no pain relief, the dosage were increased up to 3600 mg per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Percentage of Participants With Pain Relief
Day 15: Became worse
1.4 Percentage of Participants
4.0 Percentage of Participants
Percentage of Participants With Pain Relief
Day 15: No change
12.7 Percentage of Participants
14.5 Percentage of Participants
Percentage of Participants With Pain Relief
Day 15: Relieved a little
31.0 Percentage of Participants
34.2 Percentage of Participants
Percentage of Participants With Pain Relief
Day 15: Relieved moderately
26.8 Percentage of Participants
21.1 Percentage of Participants
Percentage of Participants With Pain Relief
Day 15: Relieved a lot
26.8 Percentage of Participants
26.3 Percentage of Participants
Percentage of Participants With Pain Relief
Day 15: Completely resolved
1.4 Percentage of Participants
0.0 Percentage of Participants
Percentage of Participants With Pain Relief
Day 29: Became worse
4.2 Percentage of Participants
1.3 Percentage of Participants
Percentage of Participants With Pain Relief
Day 29: No change
9.9 Percentage of Participants
10.5 Percentage of Participants
Percentage of Participants With Pain Relief
Day 29: Relieved a little
25.4 Percentage of Participants
29.0 Percentage of Participants
Percentage of Participants With Pain Relief
Day 29: Relieved moderately
21.1 Percentage of Participants
14.5 Percentage of Participants
Percentage of Participants With Pain Relief
Day 29: Relieved a lot
38.0 Percentage of Participants
44.7 Percentage of Participants
Percentage of Participants With Pain Relief
Day 29: Completely resolved
1.4 Percentage of Participants
0.0 Percentage of Participants
Percentage of Participants With Pain Relief
Day 43: Became worse
2.8 Percentage of Participants
1.3 Percentage of Participants
Percentage of Participants With Pain Relief
Day 43: No change
7.0 Percentage of Participants
11.8 Percentage of Participants
Percentage of Participants With Pain Relief
Day 43: Relieved a little
22.5 Percentage of Participants
25.0 Percentage of Participants
Percentage of Participants With Pain Relief
Day 43: Relieved moderately
19.7 Percentage of Participants
15.8 Percentage of Participants
Percentage of Participants With Pain Relief
Day 43: Relieved a lot
46.5 Percentage of Participants
42.1 Percentage of Participants
Percentage of Participants With Pain Relief
Day 43: Completely resolved
1.4 Percentage of Participants
4.0 Percentage of Participants

SECONDARY outcome

Timeframe: Day 43

Population: FAS included all randomly assigned participants who met the eligibility criteria and had at least 1 post-baseline efficacy assessment data. Here 'N' signifies number of participants who were evaluated for this outcome measure.

Overall assessment of study medication was done by participants. Assessment was made on a scale of -2 to 2 where, -2=very bad, -1=bad, 0=no change, 1= good and 2=very good.

Outcome measures

Outcome measures
Measure
Tramadol Hydrochloride/ Acetaminophen
n=67 Participants
Participants received 1 tablet containing tramadol hydrochloride (HCl) 37.5 milligram (mg) and acetaminophen 325 mg, once daily, at bed time on Day 1 to 3, 1 tablet twice daily on Day 4 to 7 and 1 tablet thrice daily on Day 8 to 14. If there was no pain relief, the dosage were increased up to 8 tablets per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Gabapentin
n=72 Participants
Participants received gabapentin 300 mg once daily at bed time on Day 1, 300 mg twice daily on Day 2 and 300 mg thrice daily on Day 3. Gabapentin 300 mg was administered twice daily (in the morning and midday) and gabapentin 600 mg in the evening on Day 8 to 14. If there was no pain relief, the dosage were increased up to 3600 mg per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Overall Assessment of Study Medication by Participants
Bad
4.5 Percentage of participants
12.5 Percentage of participants
Overall Assessment of Study Medication by Participants
No change
29.9 Percentage of participants
29.2 Percentage of participants
Overall Assessment of Study Medication by Participants
Good
50.8 Percentage of participants
41.7 Percentage of participants
Overall Assessment of Study Medication by Participants
Very good
14.9 Percentage of participants
16.7 Percentage of participants

SECONDARY outcome

Timeframe: Day 43

Population: FAS included all randomly assigned participants who met the eligibility criteria and had at least 1 post-baseline efficacy assessment data. Here 'N' signifies number of participants who were evaluated for this outcome measure.

Overall assessment of study medication was done by Investigator. Assessment was made on a scale of -2 to 2 where, -2=very bad, -1=bad, 0=no change, 1= good and 2=very good.

Outcome measures

Outcome measures
Measure
Tramadol Hydrochloride/ Acetaminophen
n=67 Participants
Participants received 1 tablet containing tramadol hydrochloride (HCl) 37.5 milligram (mg) and acetaminophen 325 mg, once daily, at bed time on Day 1 to 3, 1 tablet twice daily on Day 4 to 7 and 1 tablet thrice daily on Day 8 to 14. If there was no pain relief, the dosage were increased up to 8 tablets per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Gabapentin
n=72 Participants
Participants received gabapentin 300 mg once daily at bed time on Day 1, 300 mg twice daily on Day 2 and 300 mg thrice daily on Day 3. Gabapentin 300 mg was administered twice daily (in the morning and midday) and gabapentin 600 mg in the evening on Day 8 to 14. If there was no pain relief, the dosage were increased up to 3600 mg per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Overall Assessment of Study Medication by Investigator
Bad
0 Percentage of participants
2.8 Percentage of participants
Overall Assessment of Study Medication by Investigator
No change
31.3 Percentage of participants
30.6 Percentage of participants
Overall Assessment of Study Medication by Investigator
Good
50.8 Percentage of participants
51.4 Percentage of participants
Overall Assessment of Study Medication by Investigator
Very good
17.9 Percentage of participants
15.3 Percentage of participants

SECONDARY outcome

Timeframe: Baseline and Day 43

Population: FAS included all randomly assigned participants who met the eligibility criteria and had at least 1 post-baseline efficacy assessment data. Here 'n' signifies number of participants who were evaluated for this outcome measure at a particular time point.

The BPI is a questionnaire designed to assess the severity and impact of pain on quality of life. Pain severity score is caculated by sum of all severity items (pain worst, pain least, pain average and pain now) divided by pain now. Total score for pain severity ranges from 0=no pain to 10=extreme pain. Pain interference score was calculated by sum of all interference items (general activity, mood, walking ability, normal work, relations with other people, sleep, and enjoyment of life) score. Total score for pain interference ranges from 0=no interference to 70= interferes completely.

Outcome measures

Outcome measures
Measure
Tramadol Hydrochloride/ Acetaminophen
n=71 Participants
Participants received 1 tablet containing tramadol hydrochloride (HCl) 37.5 milligram (mg) and acetaminophen 325 mg, once daily, at bed time on Day 1 to 3, 1 tablet twice daily on Day 4 to 7 and 1 tablet thrice daily on Day 8 to 14. If there was no pain relief, the dosage were increased up to 8 tablets per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Gabapentin
n=76 Participants
Participants received gabapentin 300 mg once daily at bed time on Day 1, 300 mg twice daily on Day 2 and 300 mg thrice daily on Day 3. Gabapentin 300 mg was administered twice daily (in the morning and midday) and gabapentin 600 mg in the evening on Day 8 to 14. If there was no pain relief, the dosage were increased up to 3600 mg per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Change From Baseline in Brief Pain Inventory (BPI) Score at Day 43
Baseline: Pain severity score (n=68, 73)
4.5 Units on a scale
Standard Deviation 1.3
4.9 Units on a scale
Standard Deviation 1.8
Change From Baseline in Brief Pain Inventory (BPI) Score at Day 43
Change at Day 43: Pain severity score (n=60, 60)
0.1 Units on a scale
Standard Deviation 2.3
0.1 Units on a scale
Standard Deviation 1.9
Change From Baseline in Brief Pain Inventory (BPI) Score at Day 43
Baseline: Pain interference score (n=71, 76)
30.2 Units on a scale
Standard Deviation 14.8
29.8 Units on a scale
Standard Deviation 14.8
Change From Baseline in Brief Pain Inventory (BPI) Score at Day 43
Change at Day 43:Pain interference score(n=63, 68)
-11.0 Units on a scale
Standard Deviation 15.4
-8.8 Units on a scale
Standard Deviation 14.7

SECONDARY outcome

Timeframe: Baseline and Day 43

Population: FAS included all randomly assigned participants who met the eligibility criteria and had at least 1 post-baseline efficacy assessment data. Here 'n' signifies number of participants who were evaluated for at given time point.

The SF-36 is designed to assess the health status of participants. The SF-36 includes 1 multi-item scale measuring physical health and mental health. Physical health includes physical functioning, role limitations due to physical health, pain and general health. Mantal health includes role limitations due to emotional problems, energy/fatigue, emotional well being and social functioning. Each item is scored on a 0-100 range so that the lowest and highest possible scores are set at 0 and 100, respectively. All items are scored so that a high score defines a more favorable health state.

Outcome measures

Outcome measures
Measure
Tramadol Hydrochloride/ Acetaminophen
n=71 Participants
Participants received 1 tablet containing tramadol hydrochloride (HCl) 37.5 milligram (mg) and acetaminophen 325 mg, once daily, at bed time on Day 1 to 3, 1 tablet twice daily on Day 4 to 7 and 1 tablet thrice daily on Day 8 to 14. If there was no pain relief, the dosage were increased up to 8 tablets per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Gabapentin
n=76 Participants
Participants received gabapentin 300 mg once daily at bed time on Day 1, 300 mg twice daily on Day 2 and 300 mg thrice daily on Day 3. Gabapentin 300 mg was administered twice daily (in the morning and midday) and gabapentin 600 mg in the evening on Day 8 to 14. If there was no pain relief, the dosage were increased up to 3600 mg per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Change at Day 43: Physical functioning (n=63, 68))
3.2 Units on a scale
Standard Deviation 19.7
3.2 Units on a scale
Standard Deviation 19.4
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Baseline: Physical role limitation (n=71,76)
42.3 Units on a scale
Standard Deviation 42.8
49.3 Units on a scale
Standard Deviation 41.6
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Change at Day 43:Physical role limitation(n=62,68)
13.7 Units on a scale
Standard Deviation 41.4
10.7 Units on a scale
Standard Deviation 43.3
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Baseline: Pain (n=71,76)
49.3 Units on a scale
Standard Deviation 20.9
50.8 Units on a scale
Standard Deviation 18.1
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Change at Day 43: Pain (n=63, 68)
15.6 Units on a scale
Standard Deviation 22.7
10.4 Units on a scale
Standard Deviation 22.2
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Baseline: General health (n=71,76)
38.0 Units on a scale
Standard Deviation 20.4
40.3 Units on a scale
Standard Deviation 17.8
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Change at Day 43: General health (n=63, 68)
4.6 Units on a scale
Standard Deviation 18.8
4.4 Units on a scale
Standard Deviation 14.1
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Baseline: Emotional role limitation (n=71,76)
46.9 Units on a scale
Standard Deviation 44.9
50.4 Units on a scale
Standard Deviation 45.7
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Change at Day43:Emotional role limitation(n=63,68)
12.7 Units on a scale
Standard Deviation 49.9
18.1 Units on a scale
Standard Deviation 47.3
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Baseline: Energy/Fatigue (n=71,76)
39.4 Units on a scale
Standard Deviation 22.1
42.6 Units on a scale
Standard Deviation 19.7
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Change at Day 43: Energy/Fatigue (n=63, 68)
5.7 Units on a scale
Standard Deviation 21.8
10.0 Units on a scale
Standard Deviation 17.8
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Baseline: Emotional well-being (n=71,76)
57.2 Units on a scale
Standard Deviation 22.0
61.4 Units on a scale
Standard Deviation 18.9
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Change at Day 43: Emotional well being (n=63, 68)
5.3 Units on a scale
Standard Deviation 23.3
7.0 Units on a scale
Standard Deviation 16.0
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Baseline: Social functioning (n=71,76)
68.3 Units on a scale
Standard Deviation 23.3
72.2 Units on a scale
Standard Deviation 24.5
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Change at Dya 43: Social functioning (n=63, 68)
9.9 Units on a scale
Standard Deviation 24.9
5.5 Units on a scale
Standard Deviation 24.9
Change From Baseline in Short Form-36 (SF-36) Score at Day 43
Baseline: Phiysical functioning (n=71,76)
56.3 Units on a scale
Standard Deviation 24.1
60.6 Units on a scale
Standard Deviation 24.5

Adverse Events

Tramadol Hydrochloride/ Acetaminophen

Serious events: 0 serious events
Other events: 33 other events
Deaths: 0 deaths

Gabapentin

Serious events: 0 serious events
Other events: 18 other events
Deaths: 0 deaths

Serious adverse events

Adverse event data not reported

Other adverse events

Other adverse events
Measure
Tramadol Hydrochloride/ Acetaminophen
n=76 participants at risk
Participants received 1 tablet containing tramadol hydrochloride (HCl) 37.5 milligram (mg) and acetaminophen 325 mg, once daily, at bed time on Day 1 to 3, 1 tablet twice daily on Day 4 to 7 and 1 tablet thrice daily on Day 8 to 14. If there was no pain relief, the dosage were increased up to 8 tablets per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Gabapentin
n=80 participants at risk
Participants received gabapentin 300 mg once daily at bed time on Day 1, 300 mg twice daily on Day 2 and 300 mg thrice daily on Day 3. Gabapentin 300 mg was administered twice daily (in the morning and midday) and gabapentin 600 mg in the evening on Day 8 to 14. If there was no pain relief, the dosage were increased up to 3600 mg per day for Day 15 to 28. The increased dose was maintained for Day 29 to 42.
Nervous system disorders
Dizziness
17.1%
13/76 • Baseline up to Day 43
Safety analysis population included all randomly assigned participants who received at least 1 dose of study medication.
12.5%
10/80 • Baseline up to Day 43
Safety analysis population included all randomly assigned participants who received at least 1 dose of study medication.
Nervous system disorders
Somnolence
6.6%
5/76 • Baseline up to Day 43
Safety analysis population included all randomly assigned participants who received at least 1 dose of study medication.
6.2%
5/80 • Baseline up to Day 43
Safety analysis population included all randomly assigned participants who received at least 1 dose of study medication.
Nervous system disorders
Headache
7.9%
6/76 • Baseline up to Day 43
Safety analysis population included all randomly assigned participants who received at least 1 dose of study medication.
5.0%
4/80 • Baseline up to Day 43
Safety analysis population included all randomly assigned participants who received at least 1 dose of study medication.
Gastrointestinal disorders
Nausea
18.4%
14/76 • Baseline up to Day 43
Safety analysis population included all randomly assigned participants who received at least 1 dose of study medication.
5.0%
4/80 • Baseline up to Day 43
Safety analysis population included all randomly assigned participants who received at least 1 dose of study medication.
Gastrointestinal disorders
Dyspepsia
7.9%
6/76 • Baseline up to Day 43
Safety analysis population included all randomly assigned participants who received at least 1 dose of study medication.
3.8%
3/80 • Baseline up to Day 43
Safety analysis population included all randomly assigned participants who received at least 1 dose of study medication.

Additional Information

Clinical Research Director

Janssen Korea / 25F, LS Yongsan Tower, 191 Hankangro 2-Ga, Yongsan-Gu, Seoul 140-702 Korea

Phone: 82-2-2094-4518

Results disclosure agreements

  • Principal investigator is a sponsor employee Principal Investigator (PI) cannot provide any trial related information to external parties' without mutual agreement with the Sponsor. This is valid even after the contract is cancelled.
  • Publication restrictions are in place

Restriction type: OTHER