Recruitment Details

Key information relevant to the recruitment process for the overall study, such as dates of the recruitment period and locations
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Pre-Assignment Details

Significant events and approaches for the overall study following participant enrollment, but prior to group assignment
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Reporting Groups

	Description
Gabapentin Preoperatively	Preoperative gabapentin 600 mg p.o. within 2 hours prior to surgery.
Active Placebo	Diphenhydramine 12.5 mg p.o. 2 hours preoperatively.

Participant Flow:   Overall Study

	Gabapentin Preoperatively	Active Placebo
STARTED	72	74
COMPLETED	57	63
NOT COMPLETED	15	11

Reporting Groups

	Description
Gabapentin Preoperatively	Preoperative gabapentin 600 mg p.o. within 2 hours prior to surgery.
Active Placebo	Diphenhydramine 12.5 mg p.o. 2 hours preoperatively.

Baseline Measures

	Gabapentin Preoperatively	Active Placebo	Total
Number of Participants   [units: participants]	72	74	146
Age   [units: participants]
<=18 years	0	0	0
Between 18 and 65 years	33	38	71
>=65 years	39	36	75
Age   [units: years] Mean ± Standard Deviation	64  ± 7	64  ± 7	64  ± 7
Gender   [units: participants]
Female	32	38	70
Male	40	36	76
Region of Enrollment   [units: participants]
United States	72	74	146

1.  Primary:

Average Pain Score at Rest   [ Time Frame: 48 hours ]

2.  Primary:

Average Pain Score With Coughing the First Morning Following Surgery   [ Time Frame: First morning following surgery ]

3.  Primary:

Average Pain Score With Coughing on Second Morning After Surgery   [ Time Frame: Second morning after surgery ]

4.  Secondary:

Opioid Consumption in First 24 Hours Postoperatively   [ Time Frame: 24 hours ]

5.  Secondary:

Number of Participants With Pain at Thoracotomy Site 3 Months Postoperatively   [ Time Frame: 3 months postoperatively ]

6.  Secondary:

Opioid Consumption in Second 24 Hour Hour Period (Hours 24-48) Postoperatively   [ Time Frame: 48 hours postoperatively ]