Adjunct Phentermine + Topiramate After Bariatric Surgery in 12-24 Year Olds
Obesity, Morbid, Bariatric Surgery, Adolescent
About this trial
This is an interventional treatment trial for Obesity, Morbid focused on measuring Pilot, Feasibility, Initial Efficacy, Randomized Controlled Trial
Eligibility Criteria
Inclusion Criteria:
- Status post sleeve gastrectomy or roux-en-y gastric bypass
- At 6 months after bariatric surgery, has not achieved >= 26% decrease in weight from preoperative weight (within 1 week of surgery) OR remains severely obese (>=120% of 95th%ile or BMI >=35kg/m2 for 12-17yo; BMI >=35kg/m2 for 18-24yo)
Exclusion Criteria:
- Absolute contraindication to phentermine or topiramate (i.e. phentermine:
history of coronary artery disease, stroke, arrhythmia, congestive heart failure, uncontrolled hypertension), hypersensitivity to sympathomimetic amines, current or recent (within 14 days) use of monoamine oxidase inhibitors, glaucoma, or hyperthyroidism; topiramate: hypersensitivity to topiramate, history of nephrolithiasis)
- Concomitant use of phenytoin, carbamazepine, or carbonic anhydrase inhibitors (e.g. zonisamide, acetazolamide, or dichlorphenamide)
- Use of anti-obesity medication within 6 months of screening
- Initiation of a new medication associated with weight loss or gain within 30 days of screening
- Type 2 diabetes mellitus
- Hypothalamic obesity
- Unmanaged (e.g. without medications and/or psychotherapy) clinically significant (determined by a mental health professional using diagnostic instruments and/or clinical interview) depression or anxiety
- History of any suicidal behavior within 30 days of screening or any suicidal ideation with either some intent to act or with intent and a specific plan within 30 days of screening
- History of schizophrenia
- Severe hepatic impairment (ALT >10x upper limit of normal or known synthetic liver dysfunction)
- Moderate or severe renal impairment (GFR <30mL/min/1.73m2)
- Dosage change to hypertension, dyslipidemia, depression, or anxiety medication <4 weeks prior to study enrollment
- Contraception started <7 days prior to study enrollment
- Current pregnancy/plans to become pregnant within 16 weeks from study drug start date
- Females without a long acting reversible contraceptive (LARC) who do not commit to using 2 forms of birth control
Sites / Locations
- Children's Hospital Colorado
Arms of the Study
Arm 1
Arm 2
Experimental
Placebo Comparator
Phentermine & Topiramate
Placebo Drugs
Phentermine- Formulation: 8mg scored tablet, Dosage/Frequency/Duration: 4mg x 7d then 8mg x 7d then 12mg x 7d then 16mg x 63d, taken once every morning + Immediate release topiramate- Formulation: 25mg tablet, Dosage/Frequency/Duration: 25mg x 7d then 50mg x 7d then 75mg x 7d then 100mg x 63d then 50mg x 7 days then 25mg x 7d, taken once every morning + Standard of Care (multidisciplinary postoperative bariatric surgery clinic visits)
Placebo Phentermine- Formulation: 8mg scored tablet, Dosage/Frequency/Duration: 4mg x 7d then 8mg x 7d then 12mg x 7d then 16mg x 63d, taken once every morning + Placebo Immediate release topiramate- Formulation: 25mg tablet, Dosage/Frequency/Duration: 25mg x 7d then 50mg x 7d then 75mg x 7d then 100mg x 63d then 50mg x 7 days then 25mg x 7d, taken once every morning + Standard of Care (multidisciplinary postoperative bariatric surgery clinic visits)