Quetiapine (Seroquel XR) for the Treatment of Fibromyalgia: a Clinical and Mechanistic Pilot Study

Université de Sherbrooke

Status and phase

Completed

Phase 4

Conditions

Fibromyalgia

Treatments

Drug: quetiapine

Drug: placebo

Study type

Interventional

Funder types

Other

Identifiers

NCT00983320

D1443C00017

Details and patient eligibility

About

This is a double-blind, randomized, placebo-controlled trial measuring the impact of quetiapine on clinical and experimental measures of pain in fibromyalgia and its biochemical correlates.

Full description

This is a double-blind, randomized, placebo-controlled trial measuring the impact of quetiapine on clinical and experimental measures of pain in fibromyalgia. The study also seeks to measure the hormonal, immunological and neurochemical correlates of clinical changes in time.

Enrollment

52 patients

Sex

Female

Ages

18 to 65 years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Provision of written informed consent
A diagnosis of Fibromyalgia using the American College of Rheumatology criteria
Females aged between 18 to 65 years
Patients with an unsatisfactory response to their previous pharmacological treatment, defined as a score ≥4 on the pain severity item of the Fibromyalgia Impact Questionnaire
Female patients of childbearing potential must be using a reliable method of contraception and have a negative urine human chorionic gonadotropin (HCG) test at enrolment
Patients receiving pharmacological treatment for fibromyalgia
Able to understand and comply with the requirements of the study

Exclusion criteria

Pregnancy or lactation
Patients with DSM-IV Axis 1 disorder other than MDD and Chronic Pain Disorder within 6 months of enrolment
Elderly patients with dementia and behavioural disturbances
Patients who, in the investigator's opinion, pose a risk for suicide
Known intolerance or lack of response to quetiapine fumarate, as judged by the investigator
Use of any of the following cytochrome P450 3A4 inhibitors in the 14 days preceding enrolment including but not limited to: ketoconazole, itraconazole, fluconazole, erythromycin, clarithromycin, troleandomycin, indinavir, nelfinavir, ritonavir, fluvoxamine and saquinavir
Use of any of the following cytochrome P450 inducers in the 14 days preceding enrollment including but not limited to: phenytoin, carbamazepine, barbiturates, rifampin, St. John's Wort, and glucocorticoids
Patients already receiving an antipsychotic medication
Current substance abuse/dependence (last year), as defined by DSM-IV criteria. Psychoactive substances include: alcohol, amphetamine, barbiturate, benzodiazepine, cannabis, cocaine, hallucinogen, opiates and phencyclidine
Medical conditions that would affect absorption, distribution, metabolism, or excretion of study treatment This could relate to patients with GI problems (short GI transit), Crohn's disease or disease requiring treatment with restricted medications as indicated in exclusion criteria items 5 and 6.
Unstable or inadequately treated medical illness (e.g. congestive heart failure, angina pectoris, hypertension, hypotension) as judged by the investigator, based on the results from the physical exam, ECG, haematology, chemistry and urine screenings
Participation in another drug trial within 4 weeks prior enrolment into this study
A patient with Diabetes Mellitus (DM) fulfilling one of the following criteria:
- Unstable DM defined as enrolment glycosylated hemoglobin (HbA1c) >8.5%.
- Admitted to hospital for treatment of DM or DM related illness in past 12 weeks.
- Not under physician care for DM
- Physician responsible for patient's DM care has not indicated that patient's DM is controlled.
- Physician responsible for patient's DM care has not approved patient's participation in the study
- Has not been on the same dose of oral hypoglycaemic drug(s) and/or diet for the 4 weeks prior to randomization. For thiazolidinediones (glitazones) this period should not be less than 8 Weeks.
- Taking insulin whose daily dose on one occasion in the past 4 weeks has been more than 10% above or below their mean dose in the preceding 4 weeks Note: If a diabetic patient meets one of these criteria, the patient is to be excluded even if the treating physician believes that the patient is stable and can participate in the study.
An absolute neutrophil count (ANC) of less or equal to 1.5 x 109 per liter