There are about 173942 clinical studies being (or have been) conducted in United States. The country of the clinical trial is determined by the location of where the clinical research is being studied. Most studies are often held in multiple locations & countries.
This study will establish a network of interactive asthma clinical research groups to evaluate current therapies, new therapies, and management strategies for adult asthma.
The purpose of this study is to compare the effects of D-cycloserine and glycine for treating negative symptoms (such as loss of interest, loss of energy, loss of warmth, and loss of humor) which occur between phases of positive symptoms (marked by hallucinations, delusions, and thought confusions) in schizophrenics. Clozapine is currently the most effective treatment for negative symptoms of schizophrenia. Two other drugs, D-cycloserine and glycine, are being investigated as new treatments. D-cycloserine improves negative symptoms when added to some drugs, but may worsen these symptoms when given with clozapine. Glycine also improves negative symptoms and may still be able to improve these symptoms when given with clozapine. This study gives either D-cycloserine or glycine (or an inactive placebo) with clozapine to determine which is the best combination. Patients will be assigned to 1 of 3 groups. Group 1 will receive D-cycloserine plus clozapine. Group 2 will receive glycine plus clozapine. Group 3 will receive an inactive placebo plus clozapine. Patients will receive these medications for 8 weeks. Negative symptoms of schizophrenia will be monitored through the Scale for the Assessment of Negative Symptoms, Positive symptoms will be monitored through the Positive and Negative Syndrome Scale, and additionally subjects will complete the Brief Psychiatric Rating Scale and the Global Assessment Scale. An individual may be eligible for this study if he/she is 18 to 65 years old and has been diagnosed with schizophrenia.
The purpose of this study is to assess the abuse liability and examine the reinforcing effects of intravenous buprenorphine and buprenorphine/naloxone combinations in healthy, non-drug dependent volunteers.
The purpose of this study is to assess the abuse liability and reinforcing effects of intravenous buprenorphine and buprenorphine/naloxone combinations in heroin-dependent volunteers
The purpose of this study is to assess the abuse liability and examine the reinforcing effects of intravenous buprenorphine and buprenorphine/naloxone combinations in buprenorphine-naloxone maintained volunteers
The purpose of this study is to compare the clinical efficacy of the buprenorphine/naloxone combination tablet to methadone for opioid maintenance treatment.
The purpose of this study is to compare the clinical efficacy of daily vs. 3-day (MWF) buprenorphine/naloxone combination tablet administration and determine whether outcomes are improved when using a 3-day schedule in which all doses are ingested at the clinic vs. one in which take-home doses are given on intervening days.
The purpose of this study is to assess the clinical efficacy of the buprenorphine/naloxone combination tablet for alternate-day dosing and determine whether multiples of the daily dose are necessary to maintain an effective alternate day dosing regimen.
The purpose of this study is to define temporal profile of brain activation (rCBF) using Xenon-SPECT and O 15-PET.
The purpose of this study is to follow patients in Phase I of an inpatient study in an eight week open label assessment of piracetam in an outpatient treatment program.