Study of Gabapentin Extended Release (G-ER) in the Treatment of Vasomotor (Hot Flashes/Hot Flushes) Symptoms in Postmenopausal Women

Depomed

Status and phase: Completed; Phase 3

Conditions: Hot Flashes

Treatments: Drug: Placebo; Drug: Gabapentin Extended-Release (G-ER) 1800 mg; Drug: Gabapentin Extended-Release (G-ER) 1200 mg

Study type: Interventional

Funder types: Industry

Identifiers

NCT00755417

81-0058

BREEZE 1

Details and patient eligibility

About

Depomed's Gabapentin Extended Release (G-ER) is an investigational, extended release formulation of gabapentin that is being studied for the treatment of hot flashes in postmenopausal women.

Full description

The primary study objective is to assess the efficacy of G-ER dosed in either of the following regimens:

• G-ER 1200 mg daily (single evening dose)
• G-ER 1800 mg daily (dosed asymmetrically; 600 mg in AM/1200 mg in PM) compared to placebo in reducing the average daily frequency and severity score of moderate to severe hot flashes in postmenopausal women after 4 weeks and 12 weeks of treatment with a stable dose, compared with the baseline week.

Enrollment: 541 patients

Sex: Female

Ages: 18 to 70 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

1. Postmenopausal women aged 18 to 70 years experiencing ≥7 moderate to severe hot flashes per day (or ≥50 per week) accompanied by sweating during previous 30 days or longer.
2. Had amenorrhea for ≥12 months, amenorrhea for 6 to 12 months with serum follicle-stimulating hormone (FSH) levels >40 mIU/mL, or was ≥6 weeks postsurgical bilateral oophorectomy with or without hysterectomy.
3. Willing to discontinue the following: vaginal hormonal products; transdermal or oral estrogen or estrogen/progestin combination; intrauterine progestin; progestin implants; injectable estrogen; topical progesterone cream.
4. Had to have daily average of ≥7 moderate to severe hot flashes and had to complete ≥4 days of diary entries during baseline week to be randomized.
5. If treated with antidepressants, could not have had any changes in drug doses during past month.

Other Inclusions apply.

Exclusion criteria

1. Patient treated with a gonadotrophin releasing hormone agonist, anti-estrogens, or aromatase inhibitors within 2 months prior to study entry.
2. Patient treated with estrogen pellets or progestin injectable drugs within 6 months prior to study entry.
3. Patient experience only nighttime hot flashes or worked night shifts on a regular basis.
4. Patient was concurrently treated with gabapentin for other indications. If patient was using gabapentin for treatment of hot flashes, she could be screened after a 7-day washout period provided hot flashes returned.
5. Patient had previously experienced dose-limiting adverse events that prevented titration of gabapentin to an effective dose.
6. Patient had a hypersensitivity to gabapentin.
7. Patient was in an immunocompromised state.
8. Patient had a malignancy other than basal cell carcinoma within 2 years prior to study entry.
9. Patient had gastric reduction surgery, severe chronic diarrhea, chronic constipation, uncontrolled irritable bowel syndrome, uncontrolled inflammatory bowel disease, or unexplained weight loss.
10. Patient had clinically significant abnormal chemistry or hematology results, or calculated glomerular filtration rate <60 mL/min.
11. Patient had history of substance abuse within year prior to study entry.
12. Patient was concurrently taking morphine.
13. Patient had history of chronic hepatitis B or C, hepatitis within 3 months prior to study entry, or history of human immunodeficiency virus.

Other Exclusions apply.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Triple Blind

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541 participants in 3 patient groups, including a placebo group

G-ER 1200 mg

Experimental group

Description:

Gabapentin extended-release (G-ER) 1200 mg

Treatment:

Drug: Gabapentin Extended-Release (G-ER) 1200 mg

G-ER 1800 mg

Experimental group

Description:

Gabapentin extended-release (G-ER) 1800 mg

Treatment:

Drug: Gabapentin Extended-Release (G-ER) 1800 mg

Sugar Pill

Placebo Comparator group

Description:

Placebo 1200 mg or 1800 mg

Treatment:

Drug: Placebo