View clinical trials related to Healthy Volunteers.
Filter by:CYP2C9, is one of the major drug metabolism enzymes accounting for about 20% of the hepatic cytochrome P450 content and being second only to CYP3A4. The proposed study will explore different possible drug interactions with CYP2C9 substrates by evaluating the effect of prototype inducers and inhibitors on the phenotypic trait measurement. It is expected that the identification of drugs that might interact with CYP2C9 substrates will be used to rationalize future drug interaction studies designed to evaluate the actual magnitude of effect and its clinical implications. This approach should be particularly useful when applied to those CYP2C9 drugs characterized by a narrow therapeutic index (i.e. warfarin). This study will consist of three study periods separated from each other by a two weeks washout period. In the course of the study the subjects will receive in a double blind, crossover fashion, rifampin 300 mg. twice daily, diclofenac 50 mg twice daily. and fluconazole 200 mg. twice daily, each for one week. All drugs will be administered as identical looking tablets that will be prepared at the pharmacy of the Hadassah University Hospital and their order of administration will be randomized.On the day prior to, on day 6 of and 7 days following each drug period, the activity of CYP2C9 will be evaluated by the administration of a single phenytoin 300 mg. dose. The subjects will be requested to collect their urine for 24 hours and a single blood sample will be obtained 12 hours post phenytoin intake.
The purpose of this study is to evaluate the safety of R89674 0.25% ophthalmic solution in healthy normal volunteers
This research study goal is to analyze the plasma and the cells that make up part of the immune system. We want to learn how the plasma and cells work. These may influence why one person will develop an infection and another will not, or why one person develops severe symptoms of a disease while others remain without symptoms.
This study is being done to learn if yohimbine, a naturally occurring drug, affects the speed at which food travels through the stomach, intestines and colon, and if yohimbine affects the amount of liquid you can drink in a short period of time. Understanding how yohimbine works on the gut may help develop new treatments for patients with constipation. Yohimbine has been approved by the Food and Drug Administration (FDA) for routine clinical use, however, its use as proposed in this study is considered investigational.
Gut barrier plays a major role in defence of the organism. During catabolic states, like major surgery or inflammation, gut barrier could be altered. It has been reported that preoperative nutritional support may have beneficial effects on clinical outcome in patients with surgery on gastrointestinal tract. Glutamine, which is a conditionally essential amino, have been reported to modulate inflammatory, antioxidant responses and protein metabolism in intestine. In addition, glutamine supply improves clinical outcome in critically ill patients. Antioxidant micronutrients may also have some beneficial effects in intestine by improving antioxidant response and might also regulate protein expression. Nevertheless, effects of glutamine combined to antioxidant micronutrients have not been evaluated. Thus, the aim of this study will be to assess the influence of glutamine and glutamine-antioxidant micronutrients-containing solutions on intestinal response in humans.
We wanted to compare the relation of two different psychophysiological paradigms (PrePulse Inhibition of the startle response = PPI and P50 suppression) to each other. Additionally, we wanted to test the effect of the combined serotonin- and noradrenaline re-uptake inhibitor, imipramine, on these measures. The primary hypothesis was that PPI and P50 gating would not correlate with each other at baseline. The secondary hypothesis was that increased noradrenergic and serotonergic activity would disrupt PPI as well as P50 gating.
It is of great clinical relevance to know if selective serotonin re-uptake inhibitors affect information processing. Our hypothesis was that aspects of information processing would be disturbed whereas others would improve.
DHEA or dehydroepiandrosterone is a naturally occurring hormone secreted by tghe adrenal galnds. The secretion of HDEA declines with aging. DHEA is considered a food supplement and it is not regulated by the FDA. The purpose of this research is to evaluate ceratin of the biological effects of a reaplcement dose of DHEA. As you get older, DHEA levels are lower than you were younger. The replamcent dose is the dose of DHEA that will raise DHEA levesl to the levels found in young people. Anotehr purpose is to determine whether DHEA enhances the adaptations to an exercise training program.
In this study we are looking at the blood flow to the heart using two different chemical tags or tracers that give off a low level of radiation. The tracers used in this study are called O15-water and F17-fluoromethane. These tracers mix with the blood and will move through the body. The researchers will use positron emission tomography (PET scans)to track the tracers as they moe through the heart and chest.
Bacterial resistance to antibiotics has been a growing therapeutic problem since the late 1980s. Resistant strains of pathogenic bacteria can arise through initial selection of resistant strains in the commensal flora. The emergence of fluoroquinolone resistance in the commensal flora will be assessed in 48 healthy volunteers receiving variable doses of ciprofloxacin during 14 days. Emergence of resistance will be correlated to pharmacokinetic characteristics of ciprofloxacin.